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soc: arm: nxp_imx: rt5xx: cleanup core if booting from bootloader

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Cleanup core if booting from bootloader using RT5xx. This is required
because the call to SystemInit will push data to the stack, and the
bootloader may have configured stack limits or MPU settings. Either
would cause the core to fault if these settings are not first
cleaned up.

Perform this cleanup if the boot header is not present, as in this case
the application was likely kicked off via a bootloader.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2023-01-26 16:18:59 -06:00 • committed by Carles Cufí
commit 37a5158dc4
1 changed files with 17 additions and 1 deletions
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18
soc/arm/nxp_imx/rt5xx/soc.c
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@ -89,9 +89,10 @@ const clock_frg_clk_config_t g_frg12Config_clock_init = {
/* System clock frequency. */
extern uint32_t SystemCoreClock;
/* Main stack pointer */
extern char z_main_stack[];
#ifdef CONFIG_NXP_IMX_RT5XX_BOOT_HEADER
extern char z_main_stack[];
extern char _flash_used[];
extern void z_arm_reset(void);
@ -199,6 +200,21 @@ static void usb_device_clock_init(void)
void z_arm_platform_init(void)
{
#ifndef CONFIG_NXP_IMX_RT5XX_BOOT_HEADER
/*
* If boot did not proceed using a boot header, we should not assume
* the core is in reset state. Disable the MPU and correctly
* set the stack pointer, since we are about to push to
* the stack when we call SystemInit
*/
/* Clear stack limit registers */
__set_MSPLIM(0);
__set_PSPLIM(0);
/* Disable MPU */
MPU->CTRL &= ~MPU_CTRL_ENABLE_Msk;
/* Set stack pointer */
__set_MSP((uint32_t)(z_main_stack + CONFIG_MAIN_STACK_SIZE));
#endif /* !CONFIG_NXP_IMX_RT5XX_BOOT_HEADER */
/* This is provided by the SDK */
SystemInit();
}