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boards: arm: mimxrt595_evk_cm33: enable reboot support

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The RT595 EVK needs the ROM to toggle the reset pin of the external
flash chip during a warm reset, in order to make sure the flash
is in a valid state. Add a write to the one time programmable shadow
registers when CONFIG_REBOOT=y in order to make sure the ROM will toggle
this pin.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2023-08-17 17:51:52 -05:00 • committed by Carles Cufí
commit 67ca6e5f01
1 changed files with 13 additions and 0 deletions
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13
boards/arm/mimxrt595_evk/board.c
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@ -124,6 +124,19 @@ static int mimxrt595_evk_init(void)
#endif
#endif
#ifdef CONFIG_REBOOT
/*
* The sys_reboot API calls NVIC_SystemReset. On the RT595, the warm
* reset will not complete correctly unless the ROM toggles the
* flash reset pin. We can control this behavior using the OTP shadow
* register for OPT word BOOT_CFG1
*
* Set FLEXSPI_RESET_PIN_ENABLE=1, FLEXSPI_RESET_PIN= PIO4_5
*/
OCOTP0->OTP_SHADOW[97] = 0x164000;
#endif /* CONFIG_REBOOT */
return 0;
}