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drivers: mcux_flexspi: Default logging to disabled when XIP is used

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Program flow will behave incorrectly (memory and instruction fetches
return invalid data) if Flexspi is accessed by the Flexspi driver while
being used as XIP memory by the Cortex M7.

Set logging to disabled by when XIP mode is used in the memc and
flexspi drivers, and warn the user if they attempt to enable it.

Fixes #40133

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>
This commit is contained in:
Daniel DeGrasse 2021-11-18 09:52:56 -06:00 • committed by Christopher Friedt
commit e70907f52d
6 changed files with 72 additions and 1 deletions
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11
drivers/flash/flash_mcux_flexspi_nor.c
View file

@ -23,6 +23,17 @@
static uint8_t nor_write_buf[SPI_NOR_PAGE_SIZE];
#endif
/*
* NOTE: If CONFIG_FLASH_MCUX_FLEXSPI_XIP is selected, Any external functions
* called while interacting with the flexspi MUST be relocated to SRAM or ITCM
* at runtime, so that the chip does not access the flexspi to read program
* instructions while it is being written to
*/
#if defined(CONFIG_FLASH_MCUX_FLEXSPI_XIP) && (CONFIG_FLASH_LOG_LEVEL > 0)
#warning "Enabling flash driver logging and XIP mode simultaneously can cause \
read-while-write hazards. This configuration is not recommended."
#endif
LOG_MODULE_REGISTER(flash_flexspi_nor, CONFIG_FLASH_LOG_LEVEL);
enum {