Lines Matching +full:individual +full:- +full:port +full:- +full:switching
5 force -- enable ACPI if default was off
6 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
7 off -- disable ACPI if default was on
8 noirq -- do not use ACPI for IRQ routing
9 strict -- Be less tolerant of platforms that are not
11 rsdt -- prefer RSDT over (default) XSDT
12 copy_dsdt -- copy DSDT to memory
26 If set to vendor, prefer vendor-specific driver
58 Documentation/firmware-guide/acpi/debug.rst for more information about
116 Format: <byte> or <bitmap-list>
119 Disable auto-serialization of AML methods
122 auto-serialization feature.
140 Ignore the ACPI-based watchdog interface (WDAT) and let
161 acpi_osi=! # disable all built-in OS vendor
163 acpi_osi=!! # enable all built-in OS vendor
225 For broken nForce2 BIOS resulting in XT-PIC timer.
234 as soon as the kernel's real-mode entry point is called.
272 See Documentation/sound/alsa-configuration.rst
279 align_va_addr= [X86-64]
284 CPU-intensive style benchmark, and it can vary highly in
287 32: only for 32-bit processes
288 64: only for 64-bit processes
289 on: enable for both 32- and 64-bit processes
290 off: disable for both 32- and 64-bit processes
300 Allow execve() of 32-bit applications and setting of the
302 subset of the CPUs support 32-bit EL0. When this
303 parameter is present, the set of CPUs supporting 32-bit
305 and hot-unplug operations may be restricted.
307 See Documentation/arch/arm64/asymmetric-32bit.rst for more
310 amd_iommu= [HW,X86-64]
313 fullflush - Deprecated, equivalent to iommu.strict=1
314 off - do not initialize any AMD IOMMU found in
316 force_isolation - Force device isolation for all
321 force_enable - Force enable the IOMMU on platforms known
324 pgtbl_v1 - Use v1 page table for DMA-API (Default).
325 pgtbl_v2 - Use v2 page table for DMA-API.
326 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
328 amd_iommu_dump= [HW,X86-64]
334 amd_iommu_intr= [HW,X86-64]
337 legacy - Use legacy interrupt remapping mode.
338 vapic - Use virtual APIC mode, which allows IOMMU
340 This mode requires kvm-amd.avic=1.
377 Power management functions (SPARCstation-4/5 + deriv.)
379 Disable APC CPU standby support. SPARCstation-Fox does
380 not play well with APC CPU idle - disable it if you have
387 when initialising the APIC and IO-APIC components.
388 For X86-32, this can also be used to specify an APIC
411 0 -- disable.
412 1 -- enable.
415 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
457 audit= [KNL] Enable the audit sub-system
459 0 | off - kernel audit is disabled and can not be
461 unset - kernel audit is initialized but disabled and
463 1 | on - kernel audit is initialized and partially
476 0 - Disable the BAU.
477 1 - Enable the BAU.
478 unset - Disable the BAU.
483 baycom_par= [HW,AX25] BayCom Parallel Port AX.25 Modem
488 BayCom Serial Port AX.25 Modem (Full Duplex Mode)
493 BayCom Serial Port AX.25 Modem (Half Duplex Mode)
505 See Documentation/block/cmdline-partition.rst
518 See Documentation/admin-guide/bootconfig.rst
523 bttv.pll= See Documentation/admin-guide/media/bttv.rst
532 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
551 inclusive. See arch/mips/include/asm/pgtable-bits.h
561 - foo isn't auto-mounted if you mount all cgroups in
563 - foo isn't visible as an individually mountable
565 - if foo is an optional feature then the feature is
571 Specifying "pressure" disables per-cgroup pressure
585 nosocket -- Disable socket memory accounting.
586 nokmem -- Disable kernel memory accounting.
587 nobpf -- Disable BPF memory accounting.
592 0 -- check protection applied by kernel (includes
594 1 -- check protection requested by application.
606 numbers X. Note the Linux-specific bits are not necessarily
607 stable over kernel options, but the vendor-specific
627 force such clocks to be always-on nor does it reserve
631 information, see Documentation/driver-api/clk.rst.
633 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
650 [X86-32] pit,hpet,tsc;
657 [X86-64] hpet,tsc
663 architected timer so that code using WFE-based polling
683 clocksource-wdtest.holdoff= [KNL]
689 cma=nn[MG]@[start[MG][-end[MG]]]
700 Sets the size of kernel per-numa memory area for
702 per-numa CMA altogether. And If this option is not
704 With per-numa CMA enabled, DMA users on node nid will
731 com20020= [HW,NET] ARCnet - COM20020 chipset
735 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
739 ARCnet - COM90xx chipset (memory-mapped buffers)
762 Use the specified serial port. The options are of
768 See Documentation/admin-guide/serial-console.rst for more
778 Start an early, polled-mode console on the 8250/16550
779 UART at the specified I/O port or MMIO address,
780 switching to the matching ttyS device later.
781 MMIO inter-register address stride is either 8-bit
782 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
786 the h/w is not re-initialized.
797 If the device connected to the port is not a TTY but a braille
813 syscall, or to executing "dmesg -S --raw" or to reading
832 cpcihp_generic= [HW,PCI] Generic port I/O CompactPCI driver
834 <first_slot>,<last_slot>,<port>,<enum_bit>[,<debug>]
837 disable the cpuidle sub-system
843 disable the cpufreq sub-system
851 [X86] Delay for N microsec between assert and de-assert
863 Run kdump after running panic-notifiers and dumping
876 [KNL, X86-64, ARM64, RISCV] Select a region under 4G first, and
879 See Documentation/admin-guide/kdump/kdump.rst for further details.
884 start-[end] where start and end are both
886 Documentation/admin-guide/kdump/kdump.rst for an example.
889 [KNL, X86-64, ARM64, RISCV] range could be above 4G.
896 [KNL, X86-64, ARM64, RISCV] range under 4G. When crashkernel=X,high
901 low memory is needed to make sure DMA buffers for 32-bit
905 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
906 --> arm64: 128MiB
907 --> riscv: 128MiB
915 [KNL] Disable crypto self-tests
923 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
935 db9.dev[2|3]= [HW,JOY] Multisystem joystick support via parallel port
936 (one device per port)
937 Format: <port#>,<type>
938 See also Documentation/input/devices/joystick-parport.rst
951 [KNL] verbose locking self-tests
954 self-tests.
956 (no extra messages), setting it to -1 (all bits set)
957 will print _a_lot_ more information - normally only
992 Format: { on, no-mount, off }
994 no-mount:
999 get a -EPERM as result when trying to register files
1003 Default value is set in build-time with a kernel configuration.
1015 Documentation/admin-guide/mm/hugetlbpage.rst.
1029 delayacct [KNL] Enable per-task delay accounting
1124 entries for DMA-API debugging code. One entry is
1125 required per DMA-API allocation. Use this if the
1126 DMA-API debugging code disables itself because the
1130 With this option the DMA-API debugging driver
1148 Generic built-in EDID data sets are used, if one of
1153 available in Documentation/admin-guide/edid.rst. An EDID
1165 Control how the dt_cpu_ftrs device-tree binding is
1175 what data is available or for reverse-engineering.
1180 Documentation/admin-guide/dynamic-debug-howto.rst
1191 determined by stdout-path property in device tree's
1196 Start an early, polled-mode console on a Cadence
1197 (xuartps) serial port at the specified address. Only
1199 specified, the serial port must already be setup and
1207 Start an early, polled-mode console on the 8250/16550
1208 UART at the specified I/O port or MMIO address.
1209 MMIO inter-register address stride is either 8-bit
1210 (mmio) or 32-bit (mmio32 or mmio32be).
1220 Start an early, polled-mode console on a pl011 serial
1221 port at the specified address. The pl011 serial port
1224 the driver will use only 32-bit accessors to read/write
1228 Start an early console on a litex serial port at the
1229 specified address. The serial port must already be
1233 Start an early, polled-mode console on a meson serial
1234 port at the specified address. The serial port must
1239 Start an early, polled-mode console on an msm serial
1240 port at the specified address. The serial port
1245 Start an early, polled-mode console on an msm serial
1246 dm port at the specified address. The serial port
1251 Start an early, polled-mode console on a serial port
1253 specified address. The serial port must already be
1257 Start an early, polled-mode console on a serial port
1259 specified address. The serial port must already be
1263 Use RISC-V SBI (Supervisor Binary Interface) for early
1276 a correct base address of the selected UART port. The
1277 serial port must already be setup and configured.
1281 Start an early, polled-mode console on a lantiq serial
1282 (lqasc) port at the specified address. The serial port
1291 port must already be setup and configured.
1295 Start an early, polled-mode, output-only console on the
1300 Start an early, polled-mode console on the
1301 Armada 3700 serial port at the specified
1302 address. The serial port must already be setup
1306 Start an early, polled-mode console on a Qualcomm
1307 Generic Interface (GENI) based serial port at the
1308 specified address. The serial port must already be
1314 coherent non-x86 systems that use system memory for
1321 address must be provided, and the serial port must
1342 Only one of vga, serial, or usb debug port can
1348 replacing ttySn with an I/O port address, like this:
1350 You can find the port for a given device in
1352 2: uart:ST16650V2 port:00001008 irq:18 ...
1414 attribute is added to range 0x100000000-0x180000000 and
1415 0x10a0000000-0x1120000000.
1419 range 0x240000000-0x43fffffff.
1431 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1446 via a serial port see kgdboc_earlycon instead.
1448 elanfreq= [X86-32]
1456 See Documentation/admin-guide/kdump/kdump.rst for details.
1472 0 -- permissive (log only, no denials).
1473 1 -- enforcing (deny and log).
1505 See also Documentation/fault-injection/.
1509 See Documentation/admin-guide/sysctl/net.rst for
1513 See Documentation/admin-guide/blockdev/floppy.rst.
1516 [IA-64] Avoid check_sal_cache_flush which may hang on
1521 forcepae [X86-32]
1557 ftrace_filter=[function-list]
1559 tracer at boot up. function-list is a comma-separated
1564 ftrace_notrace=[function-list]
1566 function-list. This list can be changed at run time
1570 ftrace_graph_filter=[function-list]
1573 function-list is a comma-separated list of functions
1577 ftrace_graph_notrace=[function-list]
1579 function-list. This list is a comma-separated list of
1599 off -- Don't create device links from firmware info.
1600 permissive -- Create device links from firmware info
1603 on -- Create device links from firmware info and use it
1605 rpm -- Like "on", but also use to order runtime PM.
1618 strict -- Default. Continue waiting on consumers to
1620 timeout -- Give up waiting on consumers and call
1628 support via parallel port (up to 5 devices per port)
1629 Format: <port#>,<pad1>,<pad2>,<pad3>,<pad4>,<pad5>
1630 See also Documentation/input/devices/joystick-parport.rst
1634 gart_fix_e820= [X86-64] disable the fix e820 for K8 GART
1658 gcov_persist= [GCOV] When non-zero (default), profiling data for
1668 gpio-mockup.gpio_mockup_ranges
1671 gpio-mockup.gpio_mockup_named_lines
1703 against bounds-checking flaws in the kernel's
1709 [KNL] Should the hard-lockup detector generate
1715 for 64-bit NUMA, off otherwise.
1718 hcl= [IA-64] SGI's Hardware Graph compatibility layer
1725 corresponding firmware-first mode error processing
1735 during restoration read-only).
1761 hpet= [X86-32,HPET] option to control HPET usage
1778 number of pages to allocate per-node can be specified.
1779 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1790 Documentation/admin-guide/mm/hugetlbpage.rst.
1801 boot-time allocation of gigantic hugepages is skipped.
1829 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1835 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1851 [HW] Enable printing of interrupt data from the KBD port
1852 (disabled by default, and as a pre-condition
1854 i8042.direct [HW] Put keyboard port into non-translated mode
1858 i8042.noaux [HW] Don't check for auxiliary (== mouse) port
1859 i8042.nokbd [HW] Don't check/create keyboard port
1861 for the AUX port
1868 suspend-to-ram transitions, only during s2r
1876 i8042.kbdreset [HW] Reset device connected to KBD port
1892 -1 -- never invert brightness
1893 0 -- machine default
1894 1 -- force brightness inversion
1908 idle=nomwait: Disable mwait for CPU C-states
1936 legacy only accept legacy-NaN binaries, if supported
1938 2008 only accept 2008-NaN binaries, if supported
1947 'relaxed' straps the emulator for both legacy-NaN and
1948 2008-NaN, whereas 'strict' enables legacy-NaN only on
1957 Ignore loglevel setting - this will print /all/
2024 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2025 "ima-sigv2" }
2026 Default: "ima-ng"
2058 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2059 initcall functions. Useful for debugging built-in
2104 0 -- basic integrity auditing messages. (Default)
2105 1 -- additional integrity auditing messages.
2133 could harm performance of some high-throughput
2142 1 to 9 specify maximum depth of C-state.
2151 algorithms for p-state selection. There are two
2152 P-state selection algorithms provided by
2155 on whether or not the hardware managed P-states
2162 used along with the hardware-managed P-states (HWP)
2166 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2167 instead of acpi-cpufreq may disable platform features, such
2169 P-States information being indicated to OSPM and therefore
2172 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2185 Allow per-logical-CPU P-State performance control limits using
2188 intremap= [X86-64, Intel-IOMMU]
2193 BIOS x2APIC opt-out request will be ignored
2217 0 - Try to allocate a 32-bit DMA address first, before
2219 1 - Allocate directly from the full usable range,
2221 greater than 32-bit addressing.
2225 0 - Lazy mode.
2231 1 - Strict mode.
2234 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2236 legacy driver-specific options takes precedence.
2241 0 - Use IOMMU translation for DMA.
2242 1 - Bypass the IOMMU for DMA.
2243 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2245 io7= [HW] IO7 for Marvel-based Alpha systems
2251 Standard port 0x80 based delay
2253 Alternate port 0xed based delay (needed on some systems)
2260 See Documentation/admin-guide/nfs/nfsroot.rst.
2284 Enables support for pseudo-NMIs in the kernel. This
2303 [Deprecated - use cpusets instead]
2304 Format: [flag-list,]<cpu-list>
2319 so to protect individual CPUs the 'cpumask' file has to
2335 "number of CPUs in system - 1".
2361 The format of <cpu-list> is described above.
2365 ivrs_ioapic [HW,X86-64]
2366 Provide an override to the IOAPIC-ID<->DEVICE-ID
2370 For example, to map IOAPIC-ID decimal 10 to
2376 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2379 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2383 ivrs_hpet [HW,X86-64]
2384 Provide an override to the HPET-ID<->DEVICE-ID
2388 For example, to map HPET-ID decimal 10 to
2394 * To map HPET-ID decimal 0 to PCI device 00:14.0
2397 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2401 ivrs_acpihid [HW,X86-64]
2402 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2406 For example, to map UART-HID:UID AMD0020:0 to
2412 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2415 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2436 kernelcore= [KNL,X86,IA-64,PPC]
2439 the kernel for non-movable allocations. The requested
2449 subsystem. Note that allocations like PTEs-from-HighMem
2457 for non-movable allocations and remaining memory is used
2461 kgdbdbgp= [KGDB,HW] kgdb over EHCI usb debug port.
2464 port as it is probed via PCI. The poll interval is
2466 each poll cycle to the debug port in case you need
2468 gdb or control-c on the dbgp connection. When
2469 not using this parameter you use sysrq-g to break into
2474 or a supported polling keyboard driver (non-usb).
2501 Configure the RouterBoard 532 series on-chip
2504 kmemleak= [KNL] Boot-time kmemleak enable/disable
2510 kprobe_event=[probe-list]
2512 The probe-list is a semicolon delimited list of probe
2542 execution by eliminating the write-protection faults
2587 back to huge pages. If the value is a non-zero N, KVM will
2592 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2595 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2596 a.k.a. Two-Dimensional Page Tables. Default is 1
2600 kvm-arm.mode=
2605 nvhe: Standard nVHE-based mode, without support for
2608 protected: nVHE-based mode with support for guests whose
2611 nested: VHE-based mode with support for nested
2620 kvm-arm.vgic_v3_group0_trap=
2621 [KVM,ARM] Trap guest accesses to GICv3 group-0
2624 kvm-arm.vgic_v3_group1_trap=
2625 [KVM,ARM] Trap guest accesses to GICv3 group-1
2628 kvm-arm.vgic_v3_common_trap=
2632 kvm-arm.vgic_v4_enable=
2644 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
2645 a.k.a. Two-Dimensional Page Tables. Default is 1
2649 kvm-intel.emulate_invalid_guest_state=
2651 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
2657 kvm-intel.flexpriority=
2662 kvm-intel.nested=
2666 kvm-intel.unrestricted_guest=
2672 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2673 CVE-2018-3620.
2684 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
2704 on - enable the interface for the mitigation
2769 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
2775 lapic [X86-32,APIC] Enable the local APIC even if BIOS
2779 value for LAPIC timer one-shot implementation. Default
2802 libata.force= [LIBATA] Force configurations. The format is a comma-
2803 separated list of "[ID:]VAL" where ID is PORT[.DEVICE].
2804 PORT and DEVICE are decimal numbers matching port, link
2807 omitted, the last PORT and DEVICE values are used. If
2812 the port and all links and devices behind it. DEVICE
2814 first fan-out link behind PMP device. It does not
2824 Any ID with matching PORT is used.
2828 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
2835 * rstonce: only attempt one reset during hot-unplug
2898 lockd.nlm_tcpport=N [NFS] Assign TCP port.
2904 lockd.nlm_udpport=M [NFS] Assign UDP port.
2917 Set the number of locking read-acquisition kthreads.
2922 Set the number of locking write-acquisition kthreads.
2925 Set time (s) after boot for CPU-hotplug testing.
2928 Set time (s) between CPU-hotplug operations, or
2929 zero to disable CPU-hotplug testing.
2932 Set task-shuffle interval (jiffies). Shuffling
2933 tasks allows some CPUs to go into dyntick-idle
2938 is useful for hands-off automated testing.
2954 Run the write-side locktorture kthreads at
2955 sched_set_fifo() real-time priority.
2975 7 (KERN_DEBUG) debug-level messages
2985 logo.nologo [FB] Disables display of the built-in Linux logo.
2991 lp=port[,port...] lp=none,parport0 (lp0 not configured, lp1 uses
2992 lp=reset first parallel port). 'lp=0' disables the
2998 lp0. A port specification may be 'none' to skip
3001 port specification list means that device IDs
3002 from each port should be examined, to see if
3003 an IEEE 1284-compliant printer is attached; if
3009 time-consuming boot-time autodetection (up to 250 ms per
3030 machvec= [IA-64] Force the use of a particular machine-vector
3036 Example: machtype=lemote-yeeloong-2f-7inch
3038 max_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory greater
3051 (loop.max_loop) unconditionally pre-created at init time. The default
3054 devices can be requested on-demand with the
3055 /dev/loop-control interface.
3057 mce [X86-32] Machine Check Exception
3059 mce=option [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
3062 See Documentation/admin-guide/md.rst.
3069 Control mitigation for the Micro-architectural Data
3084 full - Enable MDS mitigation on vulnerable CPUs
3085 full,nosmt - Enable MDS mitigation and disable
3087 off - Unconditionally disable MDS mitigation
3089 On TAA-affected machines, mds=off can be prevented by
3098 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3112 [ARC,MICROBLAZE] - the limit applies only to low memory,
3115 [ARM64] - only limits memory covered by the linear
3128 [ARM,MIPS] - override the memory layout reported by
3135 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3142 per-device physically contiguous DMA buffers.
3150 See Documentation/admin-guide/mm/memory-hotplug.rst.
3175 Example: Exclude memory from 0x18690000-0x1869ffff
3189 memmap=<size>%<offset>-<oldtype>+<newtype>
3191 from <oldtype> to <newtype>. If "-<oldtype>" is left
3206 repeatable BIOS-originated corruption always
3250 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3258 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3262 s2idle - Suspend-To-Idle
3263 shallow - Power-On Suspend or equivalent (if supported)
3264 deep - Suspend-To-RAM or equivalent (if supported)
3265 See Documentation/admin-guide/pm/sleep-states.rst.
3267 mfgpt_irq= [IA-32] Specify the IRQ to use for the
3268 Multi-Function General Purpose Timers on AMD Geode
3271 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3278 min_addr=nn[KMG] [KNL,BOOT,IA-64] All physical memory below this
3285 0 - The attached screen is the 3.5" TFT
3286 1 - The attached screen is the 7" TFT
3287 2 - The VGA Shield is attached (1024x768)
3291 b - Enable backlight. The TFT backlight pin will be
3295 c - Enable the s3c camera interface.
3296 t - Reserved for enabling touchscreen support. The
3298 kernel as of 2.6.30, a preliminary port can be found
3300 https://repo.or.cz/w/linux-2.6/mini2440.git
3305 arch-independent options, each of which is an
3306 aggregation of existing arch-specific options.
3329 ssbd=force-off [ARM64]
3342 have other ways of avoiding SMT-based attacks.
3377 full - Enable mitigation on vulnerable CPUs
3379 full,nosmt - Enable mitigation and disable SMT on
3382 off - Unconditionally disable mitigation
3395 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3425 module_blacklist= [KNL] Do not load a comma-separated list of
3439 movablecore= [KNL,X86,IA-64,PPC]
3450 movable_node [KNL] Boot-time switch to make hotplugable memory
3457 Format: <name>,<region-number>,<size>,<offset>
3460 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3468 See arch/arm/mach-s3c/mach-jive.c
3504 something different and driver-specific.
3533 [NFS] set the TCP port on which the NFSv4 callback
3537 [NFS] enable 64-bit inode numbers.
3538 If zero, the NFS client will fake up a 32-bit inode
3540 of returning the full 64-bit number.
3541 The default is to return 64-bit inode numbers.
3576 [NFS4] Specify an additional fixed unique ident-
3607 driver. A non-zero value sets the minimum interval
3612 server-to-server copies for which this server is
3624 server-to-server copy, knfsd temporarily mounts
3631 See Documentation/admin-guide/nfs/nfsroot.rst.
3633 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
3634 See Documentation/admin-guide/nfs/nfsroot.rst.
3637 See Documentation/admin-guide/nfs/nfsroot.rst.
3641 NMI stack-backtrace request.
3650 0 - turn hardlockup detector in nmi_watchdog off
3651 1 - turn hardlockup detector in nmi_watchdog on
3663 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
3667 no4lvl [RISCV] Disable 4-level and 5-level paging modes. Forces
3668 kernel to use 3-level paging instead.
3670 no5lvl [X86-64,RISCV] Disable 5-level paging mode. Forces
3671 kernel to use 4-level paging instead.
3674 caches in the slab allocator. Saves per-node memory,
3711 no_entry_flush [PPC] Don't flush the L1-D cache when entering the kernel.
3713 noexec [IA-64]
3715 noexec32 [X86-64]
3716 This affects only 32-bit executables.
3717 noexec32=on: enable non-executable mappings (default)
3719 noexec32=off: disable non-executable mappings
3730 nofxsr [BUGS=X86-32] Disables x86 floating point extended
3732 legacy floating-point registers on task switch.
3734 nohalt [IA-64] Tells the kernel not to use the power saving
3736 power-consumption. On the positive side, it reduces
3737 interrupt wake-up latency, which may improve performance
3739 real-time systems.
3749 compared. However, if this command-line option is
3790 nointremap [X86-64, Intel-IOMMU] Do not enable interrupt
3792 [Deprecated - use intremap=off]
3794 nointroute [IA-64]
3798 noiotrap [SH] Disables trapped I/O port accesses.
3800 noirqdebug [X86-32] Disables the code which attempts to detect and
3805 nojitter [IA-64] Disables jitter checking for ITC timers.
3812 no-kvmapf [X86,KVM] Disable paravirtualized asynchronous page
3815 no-kvmclock [X86,KVM] Disable paravirtualized KVM clock driver
3817 nolapic [X86-32,APIC] Do not enable or use the local APIC.
3819 nolapic_timer [X86-32,APIC] Do not use the local APIC timer.
3821 nomca [IA-64] Disable machine check abort handling
3823 nomce [X86-32] Disable Machine Check Exception
3825 nomfgpt [X86-32] Disable Multi-Function General Purpose
3831 not load if they could possibly displace the pre-
3834 perform display-mode changes or accelerated rendering.
3847 nopcid [X86-64] Disable the PCID cpu feature.
3852 nopti [X86-64]
3868 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
3874 nosbagart [IA-64]
3876 no-scroll [VGA] Disables scrollback.
3877 This is required for the Braillex ib80-piezo Braille
3880 nosgx [X86-64,SGX] Disables Intel SGX kernel support.
3900 nosoftlockup [KNL] Disable the soft-lockup detector.
3905 nospectre_bhb [ARM64] Disable all mitigations for Spectre-BHB (branch
3918 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES] Disable paravirtualized
3928 [PPC] Don't flush the L1-D cache after accessing user data.
3941 no-vmw-sched-clock
3946 soft-lockup and NMI watchdog (hard-lockup).
3950 nox2apic [X86-64,APIC] Do not enable x2APIC mode.
3958 enabling legacy floating-point and sse state.
3984 nptcg= [IA-64] Override max number of concurrent global TLB
3993 n. So during boot up some boot time memory for per-cpu
3994 variables need be pre-allocated for later physical cpu
4009 See Documentation/admin-guide/sysctl/vm.rst for details.
4012 See Documentation/core-api/debugging-via-ohci1394.rst for more
4027 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4031 boundary - index of last SLC block on Flex-OneNAND.
4033 lock - Configure if Flex-OneNAND boundary should be locked.
4047 running on a platform with a direct-mapped memory-side
4053 page_owner= [KNL] Boot-time page_owner enabling option.
4059 page_poison= [KNL] Boot-time parameter changing the state of
4086 See Documentation/admin-guide/tainted-kernels.rst for
4107 parkbd.port= [HW] Parallel port number the keyboard adapter is
4110 parkbd.mode= [HW] Parallel port keyboard adapter mode of operation,
4122 settings on that particular port), or 'nofifo'
4129 Configure VIA parallel port to operate in
4132 up parallel port mode and sets it to spp.
4138 Set to non-zero to probe primary and secondary ISA
4139 port ranges on PCI systems where no PCI PATA device
4144 Set to non-zero if a chip is present that snoops speed
4161 IORDY enable mask. Set individual bits to allow IORDY
4185 PIO mode mask for autospeed devices. Set individual
4192 Set to non-zero to probe tertiary and further ISA
4193 port ranges on PCI systems. Disabled by default.
4201 of individual ports can be disabled by setting the
4203 the first port in the list above (0x1f0), and so on.
4208 Set to non-zero to probe QDI controllers. By default
4213 Set to non-zero to probe Winbond controllers. Use
4214 the standard I/O port (0x130) if 1, otherwise the
4215 value given is the I/O port to use (typically 0x1b0).
4221 Supported PIO mode mask. Set individual bits to allow
4260 bios [X86-32] force use of PCI BIOS, don't access
4262 has a non-standard PCI host bridge.
4263 nobios [X86-32] disallow use of PCI BIOS, only direct
4268 Mechanism 1 (config address in IO port 0xCF8,
4269 data in IO port 0xCFC, both 32-bit).
4271 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4272 the function, IO port 0xCFA, also 8-bit, sets
4274 through ports 0xC000-0xCFFF).
4281 root domains (aka PCI segments, in ACPI-speak).
4289 disable the use of MSI interrupts system-wide.
4294 primary IO-APIC for bridges that cannot disable
4301 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4325 F0000h-100000h range.
4330 assign-busses [X86] Always assign all PCI bus
4351 <linux-pci@vger.kernel.org>.
4355 a bug to <linux-pci@vger.kernel.org>.
4367 bfsort Sort PCI devices into breadth-first order.
4370 nobfsort Don't sort PCI devices into breadth-first order.
4372 tuning and use the BIOS-configured MPS defaults.
4382 configuration allows peer-to-peer DMA between
4385 that hot-added devices will work.
4400 A PCI-PCI bridge can be specified if resource
4406 for 4096-byte alignment.
4408 end-to-end CRC checking). Only effective if
4439 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4443 port.
4470 pcie_ports= [PCIE] PCIe port services handling:
4475 dpc-native Use native PCIe service for DPC only. May
4480 pcie_port_pm= [PCIE] PCIe port power management handling:
4492 Keep all power-domains already enabled by bootloader on,
4509 pirq= [SMP,APIC] Manual mp-table setup
4510 See Documentation/arch/x86/i386/IO-APIC.rst.
4512 plip= [PPT,NET] Parallel port network link
4514 See also Documentation/admin-guide/parport.rst.
4516 pmtmr= [X86] Manual setup of pmtmr I/O Port.
4533 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4542 { on | off | curr | res | no-curr | no-res }
4551 Ranges are in pairs (I/O port base and size).
4562 Format: <port>,<port>....
4582 none - Limited to cond_resched() calls
4583 voluntary - Limited to cond_resched() and might_sleep() calls
4584 full - Any section that isn't explicitly preempt disabled
4587 print-fatal-signals=
4593 coredump - etc.
4596 you might want to try "ulimit -i unlimited".
4608 or lockdep-detected issues (only if lock debug is on).
4617 on - unlimited logging to /dev/kmsg from userspace
4618 off - logging to /dev/kmsg disabled
4619 ratelimit - ratelimit the logging
4626 Limit processor to maximum C-state
4630 Ignore the _CST method to determine C-states,
4637 Param: "schedule" - profile schedule points.
4638 Param: "sleep" - profile D-state sleeping (millisecs).
4640 Param: "kvm" - profile VM exits.
4641 Param: <number> - step/bucket size as a power of 2 for
4670 pti= [X86-64] Control Page Table Isolation of user and
4675 on - unconditionally enable
4676 off - unconditionally disable
4677 auto - kernel detects whether your CPU model is
4683 [KNL] Number of legacy pty's. Overwrites compiled-in
4695 See Documentation/admin-guide/md.rst.
4698 See Documentation/admin-guide/blockdev/ramdisk.rst.
4717 cross-syscall address exposures. This is only
4723 ras=option[,option,...] [KNL] RAS-specific options
4729 rcu_nocbs[=cpu-list]
4734 enable the no-callback CPU mode, which prevents
4739 "p" for RCU-preempt, "s" for RCU-sched, and "g"
4743 and real-time workloads. It can also improve
4747 list of CPUs is set to no-callback mode from boot.
4751 no-callback mode from boot but the mode may be
4762 This improves the real-time response for the
4779 RCU grace-period cleanup.
4783 RCU grace-period initialization.
4787 RCU grace-period pre-initialization, that is,
4788 the propagation of recent CPU-hotplug changes up
4792 Set delay from grace-period initialization to
4805 soliciting quiescent-state help from
4817 Set the SCHED_FIFO priority of the RCU per-CPU
4820 and for the RCU grace-period kthreads (rcu_bh,
4822 set, valid values are 1-99 and the default is 1
4823 (the least-favored priority). Otherwise, when
4824 RCU_BOOST is not set, valid values are 0-99 and
4825 the default is zero (non-realtime operation).
4830 On callback-offloaded (rcu_nocbs) CPUs,
4833 use of the ->nocb_bypass list. However, in the
4834 common non-flooded case, RCU queues directly to
4835 the main ->cblist in order to avoid the extra
4836 overhead of the ->nocb_bypass list and its lock.
4838 a single jiffy, RCU pre-queues the callbacks into
4839 the ->nocb_bypass queue. The definition of "too
4848 batch limiting is re-enabled.
4852 RCU's force-quiescent-state scan will aggressively
4860 Set the page-cache refill delay (in milliseconds)
4861 in response to low-memory conditions. The range
4865 Set the shift-right count to use to compute
4866 the callback-invocation batch limit bl from
4873 Please note that this callback-invocation batch
4874 limit applies only to non-offloaded callback
4883 cache-to-cache transfer latencies.
4889 and for NUMA systems with large remote-access
4905 the wakeup overhead on the global grace-period
4907 each group's NOCB grace-period kthread.
4910 Cause the grace-period kthread to get an extra
4912 it should at force-quiescent-state time.
4925 this specifies an rcu_read_unlock()-time delay
4929 of RCU-protected pointers after the relevant
4939 per-CPU rcuc kthreads. Defaults to a non-zero
4949 grace-period primitives such as call_rcu().
4960 grace-period primitives.
4963 Set test-start holdoff period. The purpose of
4981 Test the double-argument variant of kfree_rcu().
4983 rcuscale.kfree_rcu_test_single, both the single-
4984 and double-argument variants are tested.
4987 Test the single-argument variant of kfree_rcu().
4989 rcuscale.kfree_rcu_test_double, both the single-
4990 and double-argument variants are tested.
5004 does not affect the data-collection interval,
5009 Set number of RCU readers. The value -1 selects
5011 "n" less than -1 selects N-n+1, where N is again
5012 the number of CPUs. For example, -2 selects N
5013 (the number of CPUs), -3 selects N+1, and so on.
5014 A value of "n" less than or equal to -N selects
5027 complete. This is useful for hands-off automated
5034 Write-side holdoff between grace periods,
5039 Additional write-side holdoff between grace
5057 for RCU grace-period forward-progress testing
5064 Specify the fraction of a CPU-stall-warning
5065 period to do tight-loop forward-progress testing.
5069 forward-progress tests.
5073 need_resched() during tight-loop forward-progress
5077 Use conditional/asynchronous update-side
5081 Use expedited update-side primitives, if available.
5084 Use normal (non-expedited) asynchronous
5085 update-side primitives, if available.
5088 Use normal (non-expedited) synchronous
5089 update-side primitives, if available. If all
5093 they are all non-zero.
5101 Leak an RCU-protected pointer out of the reader.
5116 Set number of RCU callback-offload togglers.
5121 callback-offload toggling attempts.
5124 Set number of RCU readers. The value -1 selects
5125 N-1, where N is the number of CPUs. A value
5126 "n" less than -1 selects N-n-2, where N is again
5127 the number of CPUs. For example, -2 selects N
5128 (the number of CPUs), -3 selects N+1, and so on.
5131 Enable debug-object double-call_rcu() testing.
5134 Set time (s) after boot for CPU-hotplug testing.
5137 Set time (jiffies) between CPU-hotplug operations,
5138 or zero to disable CPU-hotplug testing.
5141 Set the number of read-then-exit kthreads used
5143 task-exit processing.
5146 The number of times in a given read-then-exit
5147 episode that a set of read-then-exit kthreads
5152 read-then-exit testing episodes.
5155 Set task-shuffle interval (s). Shuffling tasks
5156 allows some CPUs to go into dyntick-idle mode
5161 is useful for hands-off automated testing.
5170 any other stall-related activity. Note that
5176 in scheduling-while-atomic splats.
5189 grace-period kthread to test RCU CPU stall
5209 Duration (s) of each individual boost test.
5215 Test RCU's dyntick-idle handling. See also the
5264 Use expedited grace-period primitives, for
5268 real-time latency, and degrade energy efficiency.
5272 Use only normal grace-period primitives,
5275 real-time latency, CPU utilization, and
5277 increased grace-period latency. This parameter
5284 only normal grace-period primitives. No effect
5290 post-boot attempt at an expedited RCU grace
5291 period to instead use normal non-expedited
5292 grace-period processing.
5298 a single callback queue. This switching only
5300 set to the default value of -1.
5303 Set the minimum number of callback-queuing-time
5304 lock-contention events per jiffy required to
5305 cause the RCU Tasks flavors to switch to per-CPU
5306 callback queuing. This switching only occurs
5308 the default value of -1.
5313 of -1 allows this to be automatically (and
5321 number avoids disturbing real-time workloads,
5326 cancel laziness on that CPU. Use -1 to disable
5336 only printed prior to the stall-warning message
5392 force - Override the decision by the kernel to hide the
5399 Turn on/off individual RDT features. List is:
5420 Set test-start holdoff period. The purpose of
5429 but the default has already reduced the per-pass
5434 Set number of readers. The default value of -1
5443 Set the read-side critical-section duration,
5447 Specify the read-protection implementation to test.
5466 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
5474 reservetop= [X86-32]
5491 See Documentation/power/swsusp-and-swap-files.rst
5506 AMD-based UNRET and IBPB mitigations alone do not stop
5508 sibling threads. For that reason, STIBP is used on pro-
5512 off - no mitigation
5513 auto - automatically select a migitation
5514 auto,nosmt - automatically select a mitigation,
5518 ibpb - On AMD, mitigate short speculation
5523 ibpb,nosmt - Like "ibpb" above but will disable SMT
5527 unret - Force enable untrained return thunks,
5528 only effective on AMD f15h-f17h based
5530 unret,nosmt - Like unret, but will disable SMT when STIBP
5565 ro [KNL] Mount root device read-only on boot
5568 on Mark read-only kernel memory as read-only (default).
5569 off Leave read-only kernel memory writable for debugging.
5570 full Mark read-only kernel memory and aliases as read-only
5574 Enable the uart passthrough on the designated usb port
5576 debug-uart get routed to the D+ and D- pins of the usb
5577 port and the regular usb controller gets disabled.
5582 block/early-lookup.c for details.
5607 rw [KNL] Mount root device read-write on boot
5659 to 10 seconds for built-in smp_call_function()
5666 that requesting even small non-zero numbers of
5673 The default of -1 specifies a number of kthreads
5678 test before initiating CPU-hotplug operations.
5682 CPU-hotplug operations. Specifying zero (which
5683 is the default) disables CPU-hotplug operations.
5689 Non-zero values are useful for automated tests.
5712 "wait" parameter. A value of -1 selects the
5713 default if all other weights are -1. However,
5715 value of -1 will instead select a weight of zero.
5720 non-zero "wait" parameter. See weight_single.
5733 non-zero "wait" parameter. See weight_single
5745 non-zero "wait" parameter. See weight_single
5752 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
5753 1 -- enable.
5764 0 -- disable.
5765 1 -- enable.
5768 serialnumber [BUGS=X86-32]
5770 sev=option[,option...] [X86-64] See Documentation/arch/x86/x86_64/boot-options.rst
5778 to set it to "all" by meaning -- no limit here.
5784 simeth= [IA-64]
5859 using the csdlock_debug- kernel parameter.
5861 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
5862 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
5863 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
5864 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
5865 smsc-ircc2.ircc_irq= [HW] IRQ line
5866 smsc-ircc2.ircc_dma= [HW] DMA channel
5867 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
5877 Default: -1 (no limit)
5880 [KNL] Should the soft-lockup detector generate panics.
5883 A value of 1 instructs the soft-lockup detector
5884 to panic the machine when a soft-lockup occurs. It is
5887 respective build-time switch to that functionality.
5890 [KNL] Should the soft-lockup detector generate
5895 See Documentation/admin-guide/laptops/sonypi.rst
5902 on - unconditionally enable, implies
5904 off - unconditionally disable, implies
5906 auto - kernel detects whether your CPU model is
5923 retpoline - replace indirect branches
5924 retpoline,generic - Retpolines
5925 retpoline,lfence - LFENCE; indirect branch
5926 retpoline,amd - alias for retpoline,lfence
5927 eibrs - Enhanced/Auto IBRS
5928 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
5929 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
5930 ibrs - use IBRS to protect kernel
5940 on - Unconditionally enable mitigations. Is
5943 off - Unconditionally disable mitigations. Is
5946 prctl - Indirect branch speculation is enabled,
5952 - Like "prctl" above, but only STIBP is
5954 always when switching between different user
5958 - Same as "prctl" above, but all seccomp
5963 - Like "seccomp" above, but only STIBP is
5965 always when switching between different
5968 auto - Kernel selects the mitigation depending on
5979 off - Disable mitigation
5980 microcode - Enable microcode mitigation only
5981 safe-ret - Enable sw-only safe RET mitigation (default)
5982 ibpb - Enable mitigation by issuing IBPB on
5984 ibpb-vmexit - Issue IBPB only on VMEXIT
5985 (cloud-specific mitigation)
6010 on - Unconditionally disable Speculative Store Bypass
6011 off - Unconditionally enable Speculative Store Bypass
6012 auto - Kernel detects whether the CPU model contains an
6018 prctl - Control Speculative Store Bypass per thread
6022 seccomp - Same as "prctl" above, but all seccomp threads
6030 on,auto - On Power8 and Power9 insert a store-forwarding
6034 off - No action.
6053 off - not enabled
6055 warn - the kernel will emit rate-limited warnings
6063 fatal - the kernel will send SIGBUS to applications
6068 ratelimit:N -
6088 Certain CPUs are vulnerable to an MDS-like
6108 This kernel-boot parameter defaults to 128,
6109 but takes effect only when the low-order four
6126 instead of the compile-time CONFIG_NR_CPUS.
6130 grace-period sequence counter wrap for the
6131 srcu_data structure's ->srcu_gp_seq_needed field.
6146 Specifies the number of no-delay instances
6153 Specifies the per-grace-period phase, number of
6154 non-sleeping polls of readers. Beyond this limit,
6160 Specifies number of microseconds of non-sleeping
6161 delay between each non-sleeping poll of readers.
6164 Specifies the number of update-side contention
6169 set for contention-based conversions to occur.
6179 force-on: Unconditionally enable mitigation for
6181 force-off: Unconditionally disable mitigation for
6204 stacktrace_filter=[function-list]
6206 will trace at boot up. function-list is a comma-separated
6214 Set the STI (builtin display/keyboard on the HP-PARISC
6216 as the initial boot-console.
6248 originate from a privileged port (i.e. a port in the
6254 maximum port values.
6276 to global on non-NUMA machines)
6299 swiotlb= [ARM,IA-64,PPC,MIPS,X86]
6301 <int> -- Number of I/O TLB slabs
6302 <int> -- Second integer after comma. Number of swiotlb
6305 force -- force using of bounce buffers even if they
6307 noforce -- Never use bounce buffers (for debugging)
6322 Ignore sysrq setting - this boot parameter will
6330 cache size. See Documentation/networking/ip-sysctl.rst
6337 Specify "mem" (for Suspend-to-RAM) or "standby" (for
6342 wakeup-capable RTC alarm.
6348 -1: disable all active trip points in all thermal zones
6352 -1: disable all critical trip points in all thermal zones
6359 -1: disable all passive trip points
6365 <deci-seconds>: poll all this frequency
6387 Prevent the CPU-hotplug component of torturing
6391 Dump the ftrace buffer at torture-test shutdown,
6395 with rotating-rust storage.
6400 disables verbose-printk() sleeping.
6403 Duration of each verbose-printk() sleep in jiffies.
6421 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
6459 local - Use the per CPU time stamp counter
6463 global - Event time stamps are synchronize across
6466 counter - Simple counting of events (1, 2, ..)
6470 uptime - Use jiffies as the time stamp.
6471 perf - Use the same clock that perf uses.
6472 mono - Use ktime_get_mono_fast_ns() for time stamps.
6473 mono_raw - Use ktime_get_raw_fast_ns() for time
6475 boot - Use ktime_get_boot_fast_ns() for time stamps.
6479 trace_event=[event-list]
6481 to facilitate early boot debugging. The event-list is a
6482 comma-separated list of trace events to enable. See
6485 trace_instance=[instance-info]
6505 trace_options=[option-list]
6507 The option-list is a comma delimited list of options
6521 trace_trigger=[trigger-list]
6558 See Documentation/admin-guide/mm/transhuge.rst
6566 - "tpm"
6567 - "tee"
6568 - "caam"
6578 - "kernel"
6579 - the same value as trusted.source: "tpm" or "tee"
6580 - "default"
6582 the RNG's choice is left to each individual trust source.
6589 high-resolution timer mode on older hardware, and in
6625 on - Enable TSX on the system. Although there are
6628 several previous speculation-related CVEs, and
6632 off - Disable TSX on the system. (Note that this
6640 auto - Disable TSX if X86_BUG_TAA is present,
6645 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
6651 Similar to Micro-architectural Data Sampling (MDS)
6666 full - Enable TAA mitigation on vulnerable CPUs
6669 full,nosmt - Enable TAA mitigation and disable SMT on
6672 vulnerable to cross-thread TAA attacks.
6673 off - Unconditionally disable TAA mitigation
6675 On MDS-affected machines, tsx_async_abort=off can be
6687 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
6690 TurboGraFX parallel port interface
6692 <port#>,<js1>,<js2>,<js3>,<js4>,<js5>,<js6>,<js7>
6693 See also Documentation/input/devices/joystick-parport.rst
6695 udbg-immortal [PPC] When debugging early kernel crashes that
6701 Set number of hash buckets for UDP/UDP-Lite connections
6703 uhci-hcd.ignore_oc=
6705 Some badly-designed motherboards generate lots of
6714 unwind_debug [X86-64]
6722 (default -1 = authorized (same as 1),
6724 if device connected to internal port)
6728 for newly-detected USB devices (default 2). This
6756 [USB] Specifies timeout for the initial 64-byte
6763 [USB] A list of quirk entries to augment the built-in
6766 VendorID:ProductID:Flags. The IDs are 4-digit hex
6768 will change the built-in quirk; setting it if it is
6773 a 255-byte read);
6777 Set-Interface requests);
6796 (bInterval-1).
6819 delay after resetting its port);
6831 usb-storage.delay_use=
6835 usb-storage.quirks=
6837 override the built-in unusual_devs list. List
6840 and Product ID values (4-digit hex numbers) and
6842 to a common usb-storage quirk flag as follows:
6884 medium is write-protected).
6893 1 - undefined instruction events
6894 2 - system calls
6895 4 - invalid data aborts
6896 8 - SIGSEGV faults
6897 16 - SIGBUS faults
6913 vdso32= [X86] Control the 32-bit vDSO
6914 vdso32=1: enable 32-bit VDSO
6915 vdso32=0 or vdso32=2: disable 32-bit VDSO
6925 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
6927 vector= [IA-64,SMP]
6959 vga= [BOOT,X86-32] Select a particular video mode
6961 Documentation/admin-guide/svga.rst.
6976 - Disable all of the above options
6997 vsyscall= [X86-64]
7000 code). Most statically-linked binaries and older
7024 see VGA-softcursor.txt. Default: 2 = underline.
7029 This is a 16-member array composed of values
7030 ranging from 0-255.
7035 This is a 16-member array composed of values
7036 ranging from 0-255.
7041 This is a 16-member array composed of values
7042 ranging from 0-255.
7047 Set system-wide default UTF-8 mode for all tty's.
7048 Default is 1, i.e. UTF-8 mode is enabled for all
7053 Format=<-1|0|1>
7054 Set system-wide default for whether a cursor
7055 is shown on new VTs. Default is -1,
7057 overridden by individual drivers. 0 will hide
7060 vt.italic= [VT] Default color for italic text; 0-15.
7063 vt.underline= [VT] Default color for underlined text; 0-15.
7067 see Documentation/watchdog/watchdog-parameters.rst
7068 or other driver-specific files in the
7082 Format: <cpu-list>
7096 Per-cpu work items which run for longer than this
7099 them from noticeably delaying other per-cpu work
7108 Per-cpu workqueues are generally preferred because
7110 locality; unfortunately, per-cpu workqueues tend to
7113 Enabling this makes the per-cpu workqueues which
7127 Documentation/core-api/workqueue.rst.
7140 forces round-robin CPU selection to flush out
7148 on - Enable writecombine, use WUC for ioremap_wc()
7149 off - Disable writecombine, use SUC for ioremap_wc()
7151 x2apic_phys [X86-64,APIC] Use x2apic physical mode instead of
7155 xen_512gb_limit [KNL,X86-64,XEN]
7165 ide-disks -- unplug primary master IDE devices
7166 aux-ide-disks -- unplug non-primary-master IDE devices
7167 nics -- unplug network devices
7168 all -- unplug all emulated devices (NICs and IDE disks)
7169 unnecessary -- unplugging emulated devices is
7172 never -- do not unplug even if version check succeeds
7180 Select whether to always use non-faulting (safe) MSR
7205 xen_timer_slop= [X86-64,XEN]
7230 preferred over the 2-level event handling, as it is
7247 xive.store-eoi=off [PPC]
7253 xhci-hcd.quirks [USB,KNL]