diff options
| -rw-r--r-- | src/mainboard/opencellular/elgon/bootblock.c | 45 |
1 files changed, 44 insertions, 1 deletions
diff --git a/src/mainboard/opencellular/elgon/bootblock.c b/src/mainboard/opencellular/elgon/bootblock.c index e6109f1072..9dfd1b8ba3 100644 --- a/src/mainboard/opencellular/elgon/bootblock.c +++ b/src/mainboard/opencellular/elgon/bootblock.c @@ -18,6 +18,9 @@ #include <soc/spi.h> #include <soc/uart.h> #include <soc/gpio.h> +#include <spi_flash.h> +#include <console/console.h> +#include <fmap.h> #include "mainboard.h" void bootblock_mainboard_early_init(void) @@ -49,8 +52,48 @@ static void configure_spi_flash(void) gpio_output(ELGON_GPIO_SPI_MUX, 1); } +/** + * Handle flash write protection. + * This code verifies the write-protection on each boot. + * Enabling the write protection does only run on the first boot. + * An error is fatal as it breaks the Chain Of Trust. + */ +static void protect_ro_rgn_spi_flash(void) +{ + const struct spi_flash *flash = boot_device_spi_flash(); + const char *fmapname = "WP_RO"; + struct region ro_rgn; + + if (fmap_locate_area(fmapname, &ro_rgn)) { + printk(BIOS_ERR, "%s: No %s FMAP section.\n", __func__, + fmapname); + die("Can't verify flash protections!"); + } + + u8 reg8 = 0; + spi_flash_status(flash, ®8); + + /* Check if SRP0 is set and RO region is protected */ + if (!(reg8 & 0x80) || + spi_flash_is_write_protected(flash, &ro_rgn) != 1) { + printk(BIOS_WARNING, "%s: FMAP section %s is not write-protected\n", + __func__, fmapname); + + /* + * Need to protect flash region : + * WP_RO read only and use /WP pin + * non-volatile programming + */ + if (spi_flash_set_write_protected(flash, &ro_rgn, 1, + SPI_WRITE_PROTECTION_PIN) != 0) + die("Failed to write-protect WP_RO region!"); + } + printk(BIOS_INFO, "%s: FMAP section %s is write-protected\n", + __func__, fmapname); +} + void bootblock_mainboard_init(void) { configure_spi_flash(); - // FIXME: Check SPI flash WP bits + protect_ro_rgn_spi_flash(); } |