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ARM: imx: Factor out parsing of ROM log

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Factor out parsing of ROM log in function spl_mmc_emmc_boot_partition().
This can be helpful to detect a secondary image boot without fiddling
around with MMC partitions. This way for example, U-Boot is able to
detect a secondary image boot and can enter some fallback scenario like
starting a recovery mode.

Signed-off-by: Fedor Ross <fedor.ross@ifm.com>
Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Fedor Ross 2023-10-16 18:16:13 +02:00 • committed by Stefano Babic
parent e936db9536
commit 6c97153b04
1 changed files with 37 additions and 18 deletions
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55
arch/arm/mach-imx/imx8m/soc.c
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@ -648,19 +648,17 @@ struct rom_api *g_rom_api = (struct rom_api *)0x980;
#if defined(CONFIG_IMX8M)
#include <spl.h>
int spl_mmc_emmc_boot_partition(struct mmc *mmc)
int imx8m_detect_secondary_image_boot(void)
{
u32 *rom_log_addr = (u32 *)0x9e0;
u32 *rom_log;
u8 event_id;
int i, part;
part = default_spl_mmc_emmc_boot_partition(mmc);
int i, boot_secondary = 0;
/* If the ROM event log pointer is not valid. */
if (*rom_log_addr < 0x900000 || *rom_log_addr >= 0xb00000 ||
*rom_log_addr & 0x3)
return part;
return -EINVAL;
/* Parse the ROM event ID version 2 log */
rom_log = (u32 *)(uintptr_t)(*rom_log_addr);
@ -668,7 +666,7 @@ int spl_mmc_emmc_boot_partition(struct mmc *mmc)
event_id = rom_log[i] >> 24;
switch (event_id) {
case 0x00: /* End of list */
return part;
return boot_secondary;
/* Log entries with 1 parameter, skip 1 */
case 0x80: /* Start to perform the device initialization */
case 0x81: /* The boot device initialization completes */
@ -686,24 +684,45 @@ int spl_mmc_emmc_boot_partition(struct mmc *mmc)
continue;
/* Boot from the secondary boot image */
case 0x51:
/*
* Swap the eMMC boot partitions in case there was a
* fallback event (i.e. primary image was corrupted
* and that corruption was recognized by the BootROM),
* so the SPL loads the rest of the U-Boot from the
* correct eMMC boot partition, since the BootROM
* leaves the boot partition set to the corrupted one.
*/
if (part == 1)
part = 2;
else if (part == 2)
part = 1;
boot_secondary = 1;
continue;
default:
continue;
}
}
return boot_secondary;
}
int spl_mmc_emmc_boot_partition(struct mmc *mmc)
{
int part, ret;
part = default_spl_mmc_emmc_boot_partition(mmc);
if (part == 0)
return part;
ret = imx8m_detect_secondary_image_boot();
if (ret < 0) {
printf("Could not get boot partition! Using %d\n", part);
return part;
}
if (ret == 1) {
/*
* Swap the eMMC boot partitions in case there was a
* fallback event (i.e. primary image was corrupted
* and that corruption was recognized by the BootROM),
* so the SPL loads the rest of the U-Boot from the
* correct eMMC boot partition, since the BootROM
* leaves the boot partition set to the corrupted one.
*/
if (part == 1)
part = 2;
else if (part == 2)
part = 1;
}
return part;
}
#endif