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drivers: flash: mcux flexspi nor: copy data to RAM buffer on write

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This feature prevents issues when trying to write data to the flash
device that is located on or addressed at the same flash device.

An example is the mcuboot logic that writes a magic number to
the secondary partition header.

Signed-off-by: Pieter De Gendt <pieter.degendt@basalte.be>
This commit is contained in:
Pieter De Gendt 2021-04-07 20:51:34 +02:00 • committed by Maureen Helm
commit 3ee5f427e6
2 changed files with 20 additions and 0 deletions
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11
drivers/flash/flash_mcux_flexspi_nor.c
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@ -19,6 +19,10 @@
#define NOR_WRITE_SIZE 1
#define NOR_ERASE_VALUE 0xff
#ifdef CONFIG_FLASH_MCUX_FLEXSPI_NOR_WRITE_BUFFER
static uint8_t nor_write_buf[SPI_NOR_PAGE_SIZE];
#endif
LOG_MODULE_REGISTER(flash_flexspi_nor, CONFIG_FLASH_LOG_LEVEL);
enum {
@ -346,8 +350,15 @@ static int flash_flexspi_nor_write(const struct device *dev, off_t offset,
while (len) {
i = MIN(SPI_NOR_PAGE_SIZE, len);
#ifdef CONFIG_FLASH_MCUX_FLEXSPI_NOR_WRITE_BUFFER
memcpy(nor_write_buf, src, i);
#endif
flash_flexspi_nor_write_enable(dev);
#ifdef CONFIG_FLASH_MCUX_FLEXSPI_NOR_WRITE_BUFFER
flash_flexspi_nor_page_program(dev, offset, nor_write_buf, i);
#else
flash_flexspi_nor_page_program(dev, offset, src, i);
#endif
flash_flexspi_nor_wait_bus_busy(dev);
memc_flexspi_reset(data->controller);
src += i;