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drivers/spi_flash: Always exit 4-byte address mode when memory-mapped 

Always send the Exit 4-Byte Address Mode (E9h) command before the first
access to the SPI flash in all stages when the SPI flash is
memory-mapped.  This is useful for x86 mainboards that do not access SPI
flash in bootblock yet still need to exit 4-byte addressing mode in
romstage or ramstage.

Signed-off-by: Fred Reitberger <reitbergerfred@gmail.com>
Change-Id: I3a62bfa44a0a5645c1bb80b32d0b9f92075c66bf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76093
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Fred Reitberger 2023-06-23 09:48:36 -04:00 committed by Felix Held
parent 00d71ffca8
commit 865180d681
1 changed files with 6 additions and 1 deletions
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7
src/drivers/spi/spi_flash.c
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@ -18,6 +18,9 @@
#define ADDR_MOD 0
#endif
#define SPI_FLASH_EXIT_4BYTE_STAGE \
(ENV_INITIAL_STAGE || CONFIG(BOOT_DEVICE_MEMORY_MAPPED))
static void spi_flash_addr(u32 addr, u8 *cmd)
{
/* cmd[0] is actual command */
@ -548,8 +551,10 @@ int spi_flash_probe(unsigned int bus, unsigned int cs, struct spi_flash *flash)
CONFIG_ROM_SIZE);
}
if (CONFIG(SPI_FLASH_EXIT_4_BYTE_ADDR_MODE) && ENV_INITIAL_STAGE)
if (CONFIG(SPI_FLASH_EXIT_4_BYTE_ADDR_MODE) && SPI_FLASH_EXIT_4BYTE_STAGE) {
printk(BIOS_DEBUG, "SF: Exiting 4-byte addressing mode\n");
spi_flash_cmd(&flash->spi, CMD_EXIT_4BYTE_ADDR_MODE, NULL, 0);
}
return 0;
}