spl: allow boot from first bootable partition

This was implemented in order to get dual-slot bootloader
partitions on the BeagleBone Black, whose MLO boots from
the first bootable partition: MLO chainloads u-boot in the
same way.

Signed-off-by: Jérôme Carretero <cJ-uboot@zougloub.eu>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index a3a6f31..ac61b25 100644 (file)
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -668,7 +668,8 @@ config SYS_MMCSD_FS_BOOT_PARTITION
        default 1
        help
          Partition on the MMC to load U-Boot from when the MMC is being
-         used in fs mode
+         used in fs mode.
+         Use -1 as a special value to use the first bootable partition.
 
 config SPL_MMC_TINY
        bool "Tiny MMC framework in SPL"

diff --git a/common/spl/spl_mmc.c b/common/spl/spl_mmc.c
index 1bb785a..6116a68 100644 (file)
--- a/common/spl/spl_mmc.c
+++ b/common/spl/spl_mmc.c
@@ -280,16 +280,40 @@ static int spl_mmc_do_fs_boot(struct spl_image_info *spl_image,
 {
        int err = -ENOSYS;
 
+       __maybe_unused int partition = CONFIG_SYS_MMCSD_FS_BOOT_PARTITION;
+
+#if CONFIG_SYS_MMCSD_FS_BOOT_PARTITION == -1
+       {
+               struct disk_partition info;
+               debug("Checking for the first MBR bootable partition\n");
+               for (int type_part = 1; type_part <= DOS_ENTRY_NUMBERS; type_part++) {
+                       err = part_get_info(mmc_get_blk_desc(mmc), type_part, &info);
+                       if (err)
+                               continue;
+                       debug("Partition %d is of type %d and bootable=%d\n", type_part, info.sys_ind, info.bootable);
+                       if (info.bootable != 0) {
+                               debug("Partition %d is bootable, using it\n", type_part);
+                               partition = type_part;
+                               break;
+                       }
+               }
+               printf("Using first bootable partition: %d\n", partition);
+               if (partition == CONFIG_SYS_MMCSD_FS_BOOT_PARTITION) {
+                       return -ENOSYS;
+               }
+       }
+#endif
+
 #ifdef CONFIG_SPL_FS_FAT
        if (!spl_start_uboot()) {
                err = spl_load_image_fat_os(spl_image, bootdev, mmc_get_blk_desc(mmc),
-                       CONFIG_SYS_MMCSD_FS_BOOT_PARTITION);
+                       partition);
                if (!err)
                        return err;
        }
 #ifdef CONFIG_SPL_FS_LOAD_PAYLOAD_NAME
        err = spl_load_image_fat(spl_image, bootdev, mmc_get_blk_desc(mmc),
-                                CONFIG_SYS_MMCSD_FS_BOOT_PARTITION,
+                                partition,
                                 filename);
        if (!err)
                return err;
@@ -298,13 +322,13 @@ static int spl_mmc_do_fs_boot(struct spl_image_info *spl_image,
 #ifdef CONFIG_SPL_FS_EXT4
        if (!spl_start_uboot()) {
                err = spl_load_image_ext_os(spl_image, bootdev, mmc_get_blk_desc(mmc),
-                       CONFIG_SYS_MMCSD_FS_BOOT_PARTITION);
+                       partition);
                if (!err)
                        return err;
        }
 #ifdef CONFIG_SPL_FS_LOAD_PAYLOAD_NAME
        err = spl_load_image_ext(spl_image, bootdev, mmc_get_blk_desc(mmc),
-                                CONFIG_SYS_MMCSD_FS_BOOT_PARTITION,
+                                partition,
                                 filename);
        if (!err)
                return err;