|
1 | | -/* Based on GCC ARM embedded samples. |
2 | | - Defines the following symbols for use by code: |
3 | | - __exidx_start |
4 | | - __exidx_end |
5 | | - __etext |
6 | | - __data_start__ |
7 | | - __preinit_array_start |
8 | | - __preinit_array_end |
9 | | - __init_array_start |
10 | | - __init_array_end |
11 | | - __fini_array_start |
12 | | - __fini_array_end |
13 | | - __data_end__ |
14 | | - __bss_start__ |
15 | | - __bss_end__ |
16 | | - __end__ |
17 | | - end |
18 | | - __HeapLimit |
19 | | - __StackLimit |
20 | | - __StackTop |
21 | | - __stack (== StackTop) |
22 | | -*/ |
23 | | - |
24 | | -MEMORY |
25 | | -{ |
26 | | - FLASH_FIRMWARE (rx) : ORIGIN = 0x10000000, LENGTH = 1532k |
27 | | - /* Followed by: 4kB of NVRAM and at least 512kB of CIRCUITPY */ |
28 | | - RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 256k |
29 | | - SCRATCH_X (rwx) : ORIGIN = 0x20040000, LENGTH = 4k |
30 | | - SCRATCH_Y (rwx) : ORIGIN = 0x20041000, LENGTH = 4k |
31 | | -} |
32 | | - |
33 | | -ENTRY(_entry_point) |
34 | | - |
35 | | -SECTIONS |
36 | | -{ |
37 | | - /* Second stage bootloader is prepended to the image. It must be 256 bytes big |
38 | | - and checksummed. It is usually built by the boot_stage2 target |
39 | | - in the Pico SDK |
40 | | - */ |
41 | | - |
42 | | - .flash_begin : { |
43 | | - __flash_binary_start = .; |
44 | | - } > FLASH_FIRMWARE |
45 | | - |
46 | | - .boot2 : { |
47 | | - __boot2_start__ = .; |
48 | | - KEEP (*(.boot2)) |
49 | | - __boot2_end__ = .; |
50 | | - } > FLASH_FIRMWARE |
51 | | - |
52 | | - ASSERT(__boot2_end__ - __boot2_start__ == 256, |
53 | | - "ERROR: Pico second stage bootloader must be 256 bytes in size") |
54 | | -
|
55 | | - /* The second stage will always enter the image at the start of .text. |
56 | | - The debugger will use the ELF entry point, which is the _entry_point |
57 | | - symbol if present, otherwise defaults to start of .text. |
58 | | - This can be used to transfer control back to the bootrom on debugger |
59 | | - launches only, to perform proper flash setup. |
60 | | - */ |
61 | | -
|
62 | | - .text : { |
63 | | - __logical_binary_start = .; |
64 | | - KEEP (*(.vectors)) |
65 | | - KEEP (*(.binary_info_header)) |
66 | | - __binary_info_header_end = .; |
67 | | - KEEP (*(.reset)) |
68 | | - /* TODO revisit this now memset/memcpy/float in ROM */ |
69 | | - /* bit of a hack right now to exclude all floating point and time critical (e.g. memset, memcpy) code from |
70 | | - * FLASH ... we will include any thing excluded here in .data below by default */ |
71 | | - *(.init) |
72 | | -
|
73 | | - __property_getter_start = .; |
74 | | - *(.property_getter) |
75 | | - __property_getter_end = .; |
76 | | - __property_getset_start = .; |
77 | | - *(.property_getset) |
78 | | - __property_getset_end = .; |
79 | | -
|
80 | | - *(EXCLUDE_FILE(*libgcc.a: *libc.a:*lib_a-mem*.o *libm.a:) .text*) |
81 | | - *(.fini) |
82 | | - /* Pull all c'tors into .text */ |
83 | | - *crtbegin.o(.ctors) |
84 | | - *crtbegin?.o(.ctors) |
85 | | - *(EXCLUDE_FILE(*crtend?.o *crtend.o) .ctors) |
86 | | - *(SORT(.ctors.*)) |
87 | | - *(.ctors) |
88 | | - /* Followed by destructors */ |
89 | | - *crtbegin.o(.dtors) |
90 | | - *crtbegin?.o(.dtors) |
91 | | - *(EXCLUDE_FILE(*crtend?.o *crtend.o) .dtors) |
92 | | - *(SORT(.dtors.*)) |
93 | | - *(.dtors) |
94 | | -
|
95 | | - *(.eh_frame*) |
96 | | - . = ALIGN(4); |
97 | | - } > FLASH_FIRMWARE |
98 | | -
|
99 | | - .rodata : { |
100 | | - *(EXCLUDE_FILE(*libgcc.a: *libc.a:*lib_a-mem*.o *libm.a:) .rodata*) |
101 | | - . = ALIGN(4); |
102 | | - *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.flashdata*))) |
103 | | - . = ALIGN(4); |
104 | | - } > FLASH_FIRMWARE |
105 | | -
|
106 | | - .ARM.extab : |
107 | | - { |
108 | | - *(.ARM.extab* .gnu.linkonce.armextab.*) |
109 | | - } > FLASH_FIRMWARE |
110 | | -
|
111 | | - __exidx_start = .; |
112 | | - .ARM.exidx : |
113 | | - { |
114 | | - *(.ARM.exidx* .gnu.linkonce.armexidx.*) |
115 | | - } > FLASH_FIRMWARE |
116 | | - __exidx_end = .; |
117 | | -
|
118 | | - /* Machine inspectable binary information */ |
119 | | - . = ALIGN(4); |
120 | | - __binary_info_start = .; |
121 | | - .binary_info : |
122 | | - { |
123 | | - KEEP(*(.binary_info.keep.*)) |
124 | | - *(.binary_info.*) |
125 | | - } > FLASH_FIRMWARE |
126 | | - __binary_info_end = .; |
127 | | - . = ALIGN(4); |
128 | | -
|
129 | | - /* End of .text-like segments */ |
130 | | - __etext = .; |
131 | | -
|
132 | | - .ram_vector_table (COPY): { |
133 | | - *(.ram_vector_table) |
134 | | - } > RAM |
135 | | -
|
136 | | - .data : { |
137 | | - __data_start__ = .; |
138 | | - *(vtable) |
139 | | -
|
140 | | - *(.time_critical*) |
141 | | -
|
142 | | - /* remaining .text and .rodata; i.e. stuff we exclude above because we want it in RAM */ |
143 | | - *(.text*) |
144 | | - . = ALIGN(4); |
145 | | - *(.rodata*) |
146 | | - . = ALIGN(4); |
147 | | -
|
148 | | - *(.data*) |
149 | | -
|
150 | | - . = ALIGN(4); |
151 | | - *(.after_data.*) |
152 | | - . = ALIGN(4); |
153 | | - /* preinit data */ |
154 | | - PROVIDE_HIDDEN (__mutex_array_start = .); |
155 | | - KEEP(*(SORT(.mutex_array.*))) |
156 | | - KEEP(*(.mutex_array)) |
157 | | - PROVIDE_HIDDEN (__mutex_array_end = .); |
158 | | -
|
159 | | - . = ALIGN(4); |
160 | | - /* preinit data */ |
161 | | - PROVIDE_HIDDEN (__preinit_array_start = .); |
162 | | - KEEP(*(SORT(.preinit_array.*))) |
163 | | - KEEP(*(.preinit_array)) |
164 | | - PROVIDE_HIDDEN (__preinit_array_end = .); |
165 | | -
|
166 | | - . = ALIGN(4); |
167 | | - /* init data */ |
168 | | - PROVIDE_HIDDEN (__init_array_start = .); |
169 | | - KEEP(*(SORT(.init_array.*))) |
170 | | - KEEP(*(.init_array)) |
171 | | - PROVIDE_HIDDEN (__init_array_end = .); |
172 | | -
|
173 | | - . = ALIGN(4); |
174 | | - /* finit data */ |
175 | | - PROVIDE_HIDDEN (__fini_array_start = .); |
176 | | - *(SORT(.fini_array.*)) |
177 | | - *(.fini_array) |
178 | | - PROVIDE_HIDDEN (__fini_array_end = .); |
179 | | -
|
180 | | - *(.jcr) |
181 | | - . = ALIGN(4); |
182 | | - /* All data end */ |
183 | | - __data_end__ = .; |
184 | | - } > RAM AT> FLASH_FIRMWARE |
185 | | -
|
186 | | - .itcm : |
187 | | - { |
188 | | - . = ALIGN(4); |
189 | | - *(.itcm.*) |
190 | | -
|
191 | | - . = ALIGN(4); |
192 | | - } > RAM AT> FLASH_FIRMWARE |
193 | | - _ld_itcm_destination = ADDR(.itcm); |
194 | | - _ld_itcm_flash_copy = LOADADDR(.itcm); |
195 | | - _ld_itcm_size = SIZEOF(.itcm); |
196 | | -
|
197 | | - .dtcm_data : |
198 | | - { |
199 | | - . = ALIGN(4); |
200 | | -
|
201 | | - *(.dtcm_data.*) |
202 | | -
|
203 | | - . = ALIGN(4); |
204 | | - } > RAM AT> FLASH_FIRMWARE |
205 | | - _ld_dtcm_data_destination = ADDR(.dtcm_data); |
206 | | - _ld_dtcm_data_flash_copy = LOADADDR(.dtcm_data); |
207 | | - _ld_dtcm_data_size = SIZEOF(.dtcm_data); |
208 | | -
|
209 | | - .dtcm_bss : |
210 | | - { |
211 | | - . = ALIGN(4); |
212 | | -
|
213 | | - *(.dtcm_bss.*) |
214 | | -
|
215 | | - . = ALIGN(4); |
216 | | - } > RAM AT> RAM |
217 | | - _ld_dtcm_bss_start = ADDR(.dtcm_bss); |
218 | | - _ld_dtcm_bss_size = SIZEOF(.dtcm_bss); |
219 | | -
|
220 | | - .uninitialized_data (COPY): { |
221 | | - . = ALIGN(4); |
222 | | - *(.uninitialized_data*) |
223 | | - } > RAM |
224 | | -
|
225 | | - /* Start and end symbols must be word-aligned */ |
226 | | - .scratch_x : { |
227 | | - __scratch_x_start__ = .; |
228 | | - *(.scratch_x.*) |
229 | | - . = ALIGN(4); |
230 | | - __scratch_x_end__ = .; |
231 | | - } > SCRATCH_X AT > FLASH_FIRMWARE |
232 | | - __scratch_x_source__ = LOADADDR(.scratch_x); |
233 | | -
|
234 | | - .scratch_y : { |
235 | | - __scratch_y_start__ = .; |
236 | | - *(.scratch_y.*) |
237 | | - . = ALIGN(4); |
238 | | - __scratch_y_end__ = .; |
239 | | - } > SCRATCH_Y AT > FLASH_FIRMWARE |
240 | | - __scratch_y_source__ = LOADADDR(.scratch_y); |
241 | | -
|
242 | | - .bss : { |
243 | | - . = ALIGN(4); |
244 | | - __bss_start__ = .; |
245 | | - *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.bss*))) |
246 | | - *(COMMON) |
247 | | - . = ALIGN(4); |
248 | | - __bss_end__ = .; |
249 | | - } > RAM |
250 | | -
|
251 | | - .heap (COPY): |
252 | | - { |
253 | | - __end__ = .; |
254 | | - end = __end__; |
255 | | - *(.heap*) |
256 | | - __HeapLimit = .; |
257 | | - } > RAM |
258 | | -
|
259 | | - /* .stack*_dummy section doesn't contains any symbols. It is only |
260 | | - * used for linker to calculate size of stack sections, and assign |
261 | | - * values to stack symbols later |
262 | | - * |
263 | | - * stack1 section may be empty/missing if platform_launch_core1 is not used */ |
264 | | -
|
265 | | - /* by default we put core 0 stack at the end of scratch Y, so that if core 1 |
266 | | - * stack is not used then all of SCRATCH_X is free. |
267 | | - */ |
268 | | - .stack1_dummy (COPY): |
269 | | - { |
270 | | - *(.stack1*) |
271 | | - } > SCRATCH_X |
272 | | - .stack_dummy (COPY): |
273 | | - { |
274 | | - *(.stack*) |
275 | | - } > SCRATCH_Y |
276 | | -
|
277 | | - .flash_end : { |
278 | | - __flash_binary_end = .; |
279 | | - } > FLASH_FIRMWARE |
280 | | -
|
281 | | - /* stack limit is poorly named, but historically is maximum heap ptr */ |
282 | | - __StackLimit = ORIGIN(RAM) + LENGTH(RAM); |
283 | | - __StackOneTop = ORIGIN(SCRATCH_X) + LENGTH(SCRATCH_X); |
284 | | - __StackTop = ORIGIN(SCRATCH_Y) + LENGTH(SCRATCH_Y); |
285 | | - __StackOneBottom = __StackOneTop - SIZEOF(.stack1_dummy); |
286 | | - __StackBottom = __StackTop - SIZEOF(.stack_dummy); |
287 | | - PROVIDE(__stack = __StackTop); |
288 | | -
|
289 | | - /* Check if data + heap + stack exceeds RAM limit */ |
290 | | - ASSERT(__StackLimit >= __HeapLimit, "region RAM overflowed") |
291 | | -
|
292 | | - ASSERT( __binary_info_header_end - __logical_binary_start <= 256, "Binary info must be in first 256 bytes of the binary") |
293 | | - /* todo assert on extra code */ |
294 | | -} |
| 1 | +firmware_size = 1532k; |
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