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soc: add dummy bytes to ensure instr prefetch always valid

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The CPU might prefetch instructions, which means it in some cases
will try to fetch instruction located after the last instruction in
flash.text.

Add dummy bytes to ensure fetching these wont result in an error,
 e.g. MMU exceptions
This commit is contained in:
Marius Vikhammer 2021-03-29 12:18:25 +08:00
parent 7504329ef9
commit 4463db7e7f
2 changed files with 16 additions and 0 deletions
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8
components/bootloader/subproject/main/esp32.bootloader.ld
View File

@ -162,6 +162,14 @@ SECTIONS
*(.fini.literal) *(.fini.literal)
*(.fini) *(.fini)
*(.gnu.version) *(.gnu.version)
/** CPU will try to prefetch up to 16 bytes of
* of instructions. This means that any configuration (e.g. MMU, PMS) must allow
* safe access to up to 16 bytes after the last real instruction, add
* dummy bytes to ensure this
*/
. += 16;
_text_end = ABSOLUTE(.); _text_end = ABSOLUTE(.);
_etext = .; _etext = .;
} > iram_seg } > iram_seg

8
components/esp32/ld/esp32.project.ld.in
View File

@ -327,6 +327,14 @@ SECTIONS
*(.fini.literal) *(.fini.literal)
*(.fini) *(.fini)
*(.gnu.version) *(.gnu.version)
/** CPU will try to prefetch up to 16 bytes of
* of instructions. This means that any configuration (e.g. MMU, PMS) must allow
* safe access to up to 16 bytes after the last real instruction, add
* dummy bytes to ensure this
*/
. += 16;
_text_end = ABSOLUTE(.); _text_end = ABSOLUTE(.);
_etext = .; _etext = .;