1/* Linker script to configure memory regions.
2 * Need modifying for a specific board.
3 *   FLASH.ORIGIN: starting address of flash
4 *   FLASH.LENGTH: length of flash
5 *   RAM.ORIGIN: starting address of RAM bank 0
6 *   RAM.LENGTH: length of RAM bank 0
7 */
8MEMORY
9{
10  RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 128k
11}
12
13/* Linker script to place sections and symbol values. Should be used together
14 * with other linker script that defines memory regions FLASH and RAM.
15 * It references following symbols, which must be defined in code:
16 *   Reset_Handler : Entry of reset handler
17 *
18 * It defines following symbols, which code can use without definition:
19 *   __exidx_start
20 *   __exidx_end
21 *   __copy_table_start__
22 *   __copy_table_end__
23 *   __zero_table_start__
24 *   __zero_table_end__
25 *   __etext
26 *   __data_start__
27 *   __preinit_array_start
28 *   __preinit_array_end
29 *   __init_array_start
30 *   __init_array_end
31 *   __fini_array_start
32 *   __fini_array_end
33 *   __data_end__
34 *   __bss_start__
35 *   __bss_end__
36 *   __end__
37 *   end
38 *   __HeapLimit
39 *   __StackLimit
40 *   __StackTop
41 *   __stack
42 */
43ENTRY(_start)
44
45SECTIONS
46{
47	.text :
48	{
49		KEEP(*(.isr_vector))
50	    KEEP(*(.ramboot))
51		*(.text*)
52
53		KEEP(*(.init))
54		KEEP(*(.fini))
55
56		/* .ctors */
57		*crtbegin.o(.ctors)
58		*crtbegin?.o(.ctors)
59		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors)
60		*(SORT(.ctors.*))
61		*(.ctors)
62
63		/* .dtors */
64 		*crtbegin.o(.dtors)
65 		*crtbegin?.o(.dtors)
66 		*(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors)
67 		*(SORT(.dtors.*))
68 		*(.dtors)
69
70		*(.rodata*)
71
72		KEEP(*(.eh_frame*))
73	} > RAM
74
75	.ARM.extab :
76	{
77		*(.ARM.extab* .gnu.linkonce.armextab.*)
78	} > RAM
79
80	__exidx_start = .;
81	.ARM.exidx :
82	{
83		*(.ARM.exidx* .gnu.linkonce.armexidx.*)
84	} > RAM
85	__exidx_end = .;
86
87	/* To copy multiple ROM to RAM sections,
88	 * uncomment .copy.table section and,
89	 * define __STARTUP_COPY_MULTIPLE in startup_ARMCMx.S */
90	/*
91	.copy.table :
92	{
93		. = ALIGN(4);
94		__copy_table_start__ = .;
95		LONG (__etext)
96		LONG (__data_start__)
97		LONG (__data_end__ - __data_start__)
98		LONG (__etext2)
99		LONG (__data2_start__)
100		LONG (__data2_end__ - __data2_start__)
101		__copy_table_end__ = .;
102	} > FLASH
103	*/
104
105	/* To clear multiple BSS sections,
106	 * uncomment .zero.table section and,
107	 * define __STARTUP_CLEAR_BSS_MULTIPLE in startup_ARMCMx.S */
108	/*
109	.zero.table :
110	{
111		. = ALIGN(4);
112		__zero_table_start__ = .;
113		LONG (__bss_start__)
114		LONG (__bss_end__ - __bss_start__)
115		LONG (__bss2_start__)
116		LONG (__bss2_end__ - __bss2_start__)
117		__zero_table_end__ = .;
118	} > FLASH
119	*/
120
121	/* Location counter can end up 2byte aligned with narrow Thumb code but
122	   __etext is assumed by startup code to be the LMA of a section in RAM
123	   which must be 4byte aligned */
124	__etext = ALIGN (4);
125
126	.data :
127	{
128		__data_start__ = .;
129		*(vtable)
130		*(.data*)
131
132		. = ALIGN(4);
133		/* preinit data */
134		PROVIDE_HIDDEN (__preinit_array_start = .);
135		KEEP(*(.preinit_array))
136		PROVIDE_HIDDEN (__preinit_array_end = .);
137
138		. = ALIGN(4);
139		/* init data */
140		PROVIDE_HIDDEN (__init_array_start = .);
141		KEEP(*(SORT(.init_array.*)))
142		KEEP(*(.init_array))
143		PROVIDE_HIDDEN (__init_array_end = .);
144
145
146		. = ALIGN(4);
147		/* finit data */
148		PROVIDE_HIDDEN (__fini_array_start = .);
149		KEEP(*(SORT(.fini_array.*)))
150		KEEP(*(.fini_array))
151		PROVIDE_HIDDEN (__fini_array_end = .);
152
153		KEEP(*(.jcr*))
154		. = ALIGN(4);
155		/* All data end */
156		__data_end__ = .;
157
158	} > RAM
159
160	.bss :
161	{
162		. = ALIGN(4);
163		__bss_start__ = .;
164		*(.bss*)
165		*(COMMON)
166		. = ALIGN(4);
167		__bss_end__ = .;
168	} > RAM
169
170	.heap (COPY):
171	{
172		__end__ = .;
173		PROVIDE(end = .);
174		*(.heap*)
175		__HeapLimit = .;
176	} > RAM
177
178	/* .stack_dummy section doesn't contains any symbols. It is only
179	 * used for linker to calculate size of stack sections, and assign
180	 * values to stack symbols later */
181	.stack_dummy (COPY):
182	{
183		*(.stack*)
184	} > RAM
185
186	/* Set stack top to end of RAM, and stack limit move down by
187	 * size of stack_dummy section */
188	__StackTop = ORIGIN(RAM) + LENGTH(RAM);
189	__StackLimit = __StackTop - SIZEOF(.stack_dummy);
190	PROVIDE(__stack = __StackTop);
191
192	/* Check if data + heap + stack exceeds RAM limit */
193	ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed with stack")
194}
195