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boards: arm: lpcxpresso55s69: Disable flash access for NS

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When using the LPC55S69 with TF-M, the ROM-based flash
controller is restricted to the secure processing environment
to prevent NS access to flash memory. Any access to the
flash controller will cause a secure fault, and the NS
application will halt execution.

This commit disables access to the IAP flash peripheral
when using the lpcxpresso55s69_ns target, enabling TF-M
to restrict IAP access to the secure side.

Signed-off-by: Kevin Townsend <kevin.townsend@linaro.org>
This commit is contained in:
Kevin Townsend 2021-05-25 12:58:31 +02:00 • committed by Kumar Gala
commit f5c6afeccb
2 changed files with 3 additions and 0 deletions
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1
soc/arm/nxp_lpc/lpc55xxx/Kconfig.defconfig.lpc55S69_cpu0
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@ -23,6 +23,7 @@ config UART_MCUX_FLEXCOMM
config SOC_FLASH_MCUX config SOC_FLASH_MCUX
default y default y
depends on FLASH depends on FLASH
depends on !TRUSTED_EXECUTION_NONSECURE
config WDT_MCUX_WWDT config WDT_MCUX_WWDT
default y default y

2
soc/arm/nxp_lpc/lpc55xxx/soc.c
View file

@ -50,8 +50,10 @@ static ALWAYS_INLINE void clock_init(void)
/* Enable FRO HF(96MHz) output */ /* Enable FRO HF(96MHz) output */
CLOCK_SetupFROClocking(96000000U); CLOCK_SetupFROClocking(96000000U);
#if defined(CONFIG_SOC_FLASH_MCUX)
/*!< Set FLASH wait states for core */ /*!< Set FLASH wait states for core */
CLOCK_SetFLASHAccessCyclesForFreq(96000000U); CLOCK_SetFLASHAccessCyclesForFreq(96000000U);
#endif
/*!< Set up dividers */ /*!< Set up dividers */
CLOCK_SetClkDiv(kCLOCK_DivAhbClk, 1U, false); CLOCK_SetClkDiv(kCLOCK_DivAhbClk, 1U, false);