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arch/arm/src/imxrt/imxrt_start.c: Clear CONTROL register at start to make sure we use MSP as the stack pointer

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When entering the function from an external bootloader, the CPU could be using PSP. But the following
code expects MSP to be in use.

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
This commit is contained in:
Jukka Laitinen 2024-02-13 14:28:42 +02:00 committed by Xiang Xiao
parent 8ff3b90742
commit 0dee4eb7f0
1 changed files with 6 additions and 1 deletions
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arch/arm/src/imxrt/imxrt_start.c
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@ -149,11 +149,16 @@ void __start(void)
const register uint32_t *src;
register uint32_t *dest;
/* Make sure that interrupts are disabled and set SP */
/* Make sure that interrupts are disabled and set MSP */
__asm__ __volatile__ ("\tcpsid i\n");
__asm__ __volatile__ ("MSR MSP, %0\n" : : "r" (IDLE_STACK) :);
/* Make sure that we use MSP from now on */
__asm__ __volatile__ ("MSR CONTROL, %0\n" : : "r" (0) :);
__asm__ __volatile__ ("ISB SY\n");
/* Make sure VECTAB is set to NuttX vector table
* and not the one from the boot ROM and have consistency
* with debugger that automatically set the VECTAB