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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 efa6eca8b8
commit 54383f684f
4 changed files with 32 additions and 0 deletions
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8
components/bootloader/subproject/main/ld/esp32/bootloader.ld
View File

@ -164,6 +164,14 @@ SECTIONS
*(.fini.literal)
*(.fini)
*(.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(.);
_etext = .;
} > iram_seg

8
components/bootloader/subproject/main/ld/esp32s2/bootloader.ld
View File

@ -150,6 +150,14 @@ SECTIONS
*(.fini.literal)
*(.fini)
*(.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(.);
_etext = .;
} > iram_seg

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

@ -335,6 +335,14 @@ SECTIONS
*(.fini.literal)
*(.fini)
*(.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(.);
_etext = .;

8
components/esp32s2/ld/esp32s2.project.ld.in
View File

@ -321,6 +321,14 @@ SECTIONS
*(.fini.literal)
*(.fini)
*(.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(.);
_instruction_reserved_end = ABSOLUTE(.);
_etext = .;