board: st: stm32mp25: support dynamic A/B bank bootup

Enable automatic detection of the active A/B bank by retrieving
partition GUIDs from FWU metadata.

This ensures the system correctly identifies the bootable partitions
even in multi-bank scenarios, falling back to a standard bootable flag
scan if the UUIDs are missing.

To enable A/B bank bootup on stm32mp25 boards, add the following Kconfig
options to the stm32mp25_defconfig:

 CONFIG_FWU_MULTI_BANK_UPDATE=y
 CONFIG_FWU_MDATA=y
 CONFIG_FWU_NUM_BANKS=2
 CONFIG_FWU_NUM_IMAGES_PER_BANK=3
 CONFIG_CMD_FWU_METADATA=y
 CONFIG_FWU_MDATA_V2=y

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

diff --git a/board/st/stm32mp2/stm32mp2.c b/board/st/stm32mp2/stm32mp2.c
index 43bc583378e629e99acbc77f93a5909fcb8f3336..5cbbbc322a3aa45648b4b48aa06d1c18447479e3 100644 (file)
--- a/board/st/stm32mp2/stm32mp2.c
+++ b/board/st/stm32mp2/stm32mp2.c
@@ -208,4 +208,36 @@ void fwu_plat_get_bootidx(uint *boot_idx)
        *boot_idx = (readl(TAMP_FWU_BOOT_INFO_REG) >>
                    TAMP_FWU_BOOT_IDX_OFFSET) & TAMP_FWU_BOOT_IDX_MASK;
 }
+
+int fwu_platform_hook(struct udevice *dev, struct fwu_data *data)
+{
+       uint boot_idx;
+       efi_guid_t boot_uuid, root_uuid;
+       const efi_guid_t boot_type_guid = PARTITION_XBOOTLDR;
+       const efi_guid_t root_type_guid =
+               PARTITION_LINUX_FILE_SYSTEM_DATA_GUID;
+       char uuidbuf[UUID_STR_LEN + 1];
+       int retb, retr;
+
+       fwu_plat_get_bootidx(&boot_idx);
+
+       retb = fwu_mdata_get_image_guid(&boot_uuid, &boot_type_guid, boot_idx);
+       retr = fwu_mdata_get_image_guid(&root_uuid, &root_type_guid, boot_idx);
+
+       if (!retb && !retr) {
+               uuid_bin_to_str(boot_uuid.b, uuidbuf, UUID_STR_FORMAT_GUID);
+               env_set("boot_partuuid", uuidbuf);
+
+               uuid_bin_to_str(root_uuid.b, uuidbuf, UUID_STR_FORMAT_GUID);
+               env_set("root_partuuid", uuidbuf);
+       } else if (!retb && retr) {
+               log_warning("%s: found boot GUID but missing root GUID (%d)\n",
+                           __func__, retr);
+       } else if (!retr && retb) {
+               log_warning("%s: found root GUID but missing boot GUID (%d)\n",
+                           __func__, retb);
+       }
+
+       return 0;
+}
 #endif /* CONFIG_FWU_MULTI_BANK_UPDATE */

diff --git a/include/configs/stm32mp25_st_common.h b/include/configs/stm32mp25_st_common.h
index cb679eb1be22ff382d14fddd07865965cb143b1b..0b0267ae99b03e434ed4226d87f5c3673e18472a 100644 (file)
--- a/include/configs/stm32mp25_st_common.h
+++ b/include/configs/stm32mp25_st_common.h
@@ -8,7 +8,22 @@
 #ifndef __CONFIG_STM32MP25_ST_COMMON_H__
 #define __CONFIG_STM32MP25_ST_COMMON_H__
 
+#ifdef CONFIG_FWU_MULTI_BANK_UPDATE
+#define SCAN_DEV_FOR_BOOT_PARTS \
+       "setenv devplist; " \
+       "env exists boot_partuuid && " \
+               "part number ${devtype} ${devnum} ${boot_partuuid} devplist; " \
+       "env exists devplist || " \
+               "part list ${devtype} ${devnum} -bootable devplist; "
+
+#define ST_STM32MP25_FWU_ENV \
+       "altbootcmd=${bootcmd}\0"
+#else
+#define ST_STM32MP25_FWU_ENV
+#endif
+
 #define STM32MP_BOARD_EXTRA_ENV \
+       ST_STM32MP25_FWU_ENV \
        "usb_pgood_delay=2000\0" \
        "console=ttySTM0\0"