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arch: common: fix copy for ramfunc region during XIP init

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ramfunc region is copied into RAM from FLASH region during XIP init. We
copy from the loadaddr of the region, and were previously loading to the
symbol __ramfunc_start. This is incorrect when using an MPU with
alignment requirements, as the __ramfunc_start symbol may have padding
placed before it in the region. The __ramfunc_start symbol still needs
to be aligned in order to be used by the MPU though, so define a new
symbol __ramfunc_region_start, and use that symbol when copying the
__ramfunc region from FLASH to RAM.

Fixes #75296

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2024-11-01 22:36:32 +00:00 • committed by Dan Kalowsky
commit 6023d6a142
4 changed files with 5 additions and 2 deletions
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cmake/linker_script/arm/linker.cmake
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@ -144,6 +144,7 @@ endif()
include(${COMMON_ZEPHYR_LINKER_DIR}/ram-end.cmake)
zephyr_linker_symbol(SYMBOL __ramfunc_region_start EXPR "ADDR(.ramfunc)")
zephyr_linker_symbol(SYMBOL __kernel_ram_start EXPR "(@__bss_start@)")
zephyr_linker_symbol(SYMBOL __kernel_ram_end EXPR "(${RAM_ADDR} + ${RAM_SIZE})")
zephyr_linker_symbol(SYMBOL __kernel_ram_size EXPR "(@__kernel_ram_end@ - @__bss_start@)")