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arch/arm/stm32h5: copy bss and initialized data before configuring any hardware

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Some hardware configurations require bss and data initialization before being called.

Signed-off-by: Tyler Bennett <tbennett@2g-eng.com>

Fix nxstyle errors
This commit is contained in:
Joshua Lange 2025-04-14 14:42:47 -05:00 • committed by Xiang Xiao
parent 3d848810b7
commit 1c4ac3dfe7
1 changed files with 24 additions and 28 deletions
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52
arch/arm/src/stm32h5/stm32_start.c
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@ -154,6 +154,28 @@ void __start(void)
("sub r10, sp, %0" : : "r" (CONFIG_IDLETHREAD_STACKSIZE - 64) :);
#endif
/* Clear .bss. We'll do this inline (vs. calling memset) just to be
* certain that there are no issues with the state of global variables.
*/
for (dest = (uint32_t *)_sbss; dest < (uint32_t *)_ebss; )
{
*dest++ = 0;
}
/* Move the initialized data section from his temporary holding spot in
* FLASH into the correct place in SRAM. The correct place in SRAM is
* give by _sdata and _edata. The temporary location is in FLASH at the
* end of all of the other read-only data (.text, .rodata) at _eronly.
*/
for (src = (const uint32_t *)_eronly,
dest = (uint32_t *)_sdata; dest < (uint32_t *)_edata;
)
{
*dest++ = *src++;
}
#ifdef CONFIG_STM32H5_SRAM2_INIT
/* NOTE: this is optional because this may be inappropriate, especially
* if the memory is being used for it's battery backed purpose. In that
@ -183,32 +205,6 @@ void __start(void)
stm32_gpioinit();
showprogress('A');
/* Clear .bss. We'll do this inline (vs. calling memset) just to be
* certain that there are no issues with the state of global variables.
*/
for (dest = (uint32_t *)_sbss; dest < (uint32_t *)_ebss; )
{
*dest++ = 0;
}
showprogress('B');
/* Move the initialized data section from his temporary holding spot in
* FLASH into the correct place in SRAM. The correct place in SRAM is
* give by _sdata and _edata. The temporary location is in FLASH at the
* end of all of the other read-only data (.text, .rodata) at _eronly.
*/
for (src = (const uint32_t *)_eronly,
dest = (uint32_t *)_sdata; dest < (uint32_t *)_edata;
)
{
*dest++ = *src++;
}
showprogress('C');
#ifdef CONFIG_ARMV8M_STACKCHECK
arm_stack_check_init();
#endif
@ -222,12 +218,12 @@ void __start(void)
#ifdef USE_EARLYSERIALINIT
arm_earlyserialinit();
#endif
showprogress('D');
showprogress('B');
/* Initialize onboard resources */
stm32_board_initialize();
showprogress('F');
showprogress('C');
#ifdef CONFIG_STM32H5_ICACHE
stm32_enable_icache();