In your function:
__attribute__ ((section (".code_in_ram")))
void function_to_overwrite_flash() {
...
};
In your linker script:
/* Initialized data sections goes into RAM, load LMA copy after code */
.data :
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(4);
*(.code_in_ram)
*(.code_in_ram*)
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >RAM AT> FLASH
And in your startup code:
/* Copy the data segment initializers from flash to SRAM */
movs r1, #0
b LoopCopyDataInit
CopyDataInit:
ldr r3, =_sidata
ldr r3, [r3, r1]
str r3, [r0, r1]
adds r1, r1, #4
LoopCopyDataInit:
ldr r0, =_sdata
ldr r3, =_edata
adds r2, r0, r1
cmp r2, r3
bcc CopyDataInit
Note that you can use variables on the stack within that function, but any variables/constants stored in ROM will no longer be valid once you erase it.
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