1Allwinner SRAM for smp bringup:
2------------------------------------------------
3
4Allwinner's A80 SoC uses part of the secure sram for hotplugging of the
5primary core (cpu0). Once the core gets powered up it checks if a magic
6value is set at a specific location. If it is then the BROM will jump
7to the software entry address, instead of executing a standard boot.
8
9Therefore a reserved section sub-node has to be added to the mmio-sram
10declaration.
11
12Note that this is separate from the Allwinner SRAM controller found in
13../../sram/sunxi-sram.txt. This SRAM is secure only and not mappable to
14any device.
15
16Also there are no "secure-only" properties. The implementation should
17check if this SRAM is usable first.
18
19Required sub-node properties:
20- compatible : depending on the SoC this should be one of:
21		"allwinner,sun9i-a80-smp-sram"
22
23The rest of the properties should follow the generic mmio-sram discription
24found in ../../misc/sram.txt
25
26Example:
27
28	sram_b: sram@20000 {
29		/* 256 KiB secure SRAM at 0x20000 */
30		compatible = "mmio-sram";
31		reg = <0x00020000 0x40000>;
32		#address-cells = <1>;
33		#size-cells = <1>;
34		ranges = <0 0x00020000 0x40000>;
35
36		smp-sram@1000 {
37			/*
38			 * This is checked by BROM to determine if
39			 * cpu0 should jump to SMP entry vector
40			 */
41			compatible = "allwinner,sun9i-a80-smp-sram";
42			reg = <0x1000 0x8>;
43		};
44	};
45