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Fix bss section placement in db mode

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If bss contained anything a linker error was emitted about overlapping
sections. Moving the .bss section to after the .rwtext, and adding a dummy
section to pad data bus access to the bss section fixes this.
This commit is contained in:
Scott Mabin 2022-08-09 23:51:28 +01:00
parent 91ea205446
commit 99ae152f55
1 changed files with 16 additions and 8 deletions
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24
esp32c3-hal/ld/db-riscv-link.x
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@ -86,14 +86,6 @@ SECTIONS
} > REGION_DATA
_data_size = _edata - _sdata + 8;
.bss (NOLOAD) :
{
_sbss = .;
*(.sbss .sbss.* .bss .bss.*);
. = ALIGN(4);
_ebss = .;
} > REGION_BSS
.rwtext ORIGIN(REGION_RWTEXT) + _data_size : AT(_text_size + _rodata_size + _data_size){
_srwtext = .;
*(.rwtext);
@ -102,6 +94,22 @@ SECTIONS
} > REGION_RWTEXT
_rwtext_size = _erwtext - _srwtext + 8;
.rwtext.dummy (NOLOAD):
{
/* This section is required to skip .rwtext area because REGION_RWTEXT
* and REGION_BSS reflect the same address space on different buses.
*/
. = ORIGIN(REGION_BSS) + _rwtext_size;
} > REGION_BSS
.bss (NOLOAD) :
{
_sbss = .;
*(.sbss .sbss.* .bss .bss.*);
. = ALIGN(4);
_ebss = .;
} > REGION_BSS
/* fictitious region that represents the memory available for the heap */
.heap (NOLOAD) :
{