diff options
| author | Kaustabh Chakraborty <[email protected]> | 2026-02-24 21:07:09 +0530 |
|---|---|---|
| committer | Minkyu Kang <[email protected]> | 2026-02-25 10:47:03 +0900 |
| commit | db0fe21bd38f27f570ce16670ccad567efd596f4 (patch) | |
| tree | 13f6d84ab4cf8ad4d3a554ec2d67028339118cc9 /board/samsung | |
| parent | e4001865ff387b928ea3d422d673dcc7389f8665 (diff) | |
board: samsung: exynos-mobile: use blkmap for booting from userdata subpartitions
Some distributions tend to provide a single combined image with EFS and
the system root filesystem. Flashing it as-is in a single partition
(usually done in userdata partition as it is the largest) is not
bootable as U-Boot does not understand subpartitions.
Use blkmap to map the userdata partition into its own block device.
Signed-off-by: Kaustabh Chakraborty <[email protected]>
Signed-off-by: Minkyu Kang <[email protected]>
Diffstat (limited to 'board/samsung')
| -rw-r--r-- | board/samsung/exynos-mobile/exynos-mobile.c | 45 | ||||
| -rw-r--r-- | board/samsung/exynos-mobile/exynos-mobile.env | 5 |
2 files changed, 50 insertions, 0 deletions
diff --git a/board/samsung/exynos-mobile/exynos-mobile.c b/board/samsung/exynos-mobile/exynos-mobile.c index 1f61f28de5f..c5e1b186ae3 100644 --- a/board/samsung/exynos-mobile/exynos-mobile.c +++ b/board/samsung/exynos-mobile/exynos-mobile.c @@ -184,6 +184,45 @@ static void exynos_env_setup(void) env_set("fdtfile", buf); } +static int exynos_blk_env_setup(void) +{ + const char *blk_ifname; + int blk_dev = 0; + struct blk_desc *blk_desc; + struct disk_partition info = {0}; + unsigned long largest_part_start = 0, largest_part_size = 0; + int i; + + blk_ifname = "mmc"; + blk_desc = blk_get_dev(blk_ifname, blk_dev); + if (!blk_desc) { + log_err("%s: required mmc device not available\n", __func__); + return -ENODEV; + } + + for (i = 1; i < CONFIG_EFI_PARTITION_ENTRIES_NUMBERS; i++) { + if (part_get_info(blk_desc, i, &info)) + continue; + + if (info.start > largest_part_size) { + largest_part_start = info.start; + largest_part_size = info.size; + } + } + + if (largest_part_size) { + env_set("blkmap_blk_ifname", blk_ifname); + env_set_ulong("blkmap_blk_dev", blk_dev); + env_set_ulong("blkmap_blk_nr", largest_part_start); + env_set_hex("blkmap_size_r", largest_part_size); + } else { + log_warning("%s: no qualified partition for blkmap, skipping\n", + __func__); + } + + return 0; +} + static int exynos_fastboot_setup(void) { struct blk_desc *blk_dev; @@ -297,7 +336,13 @@ int board_init(void) int misc_init_r(void) { + int ret; + exynos_env_setup(); + ret = exynos_blk_env_setup(); + if (ret) + return ret; + return exynos_fastboot_setup(); } diff --git a/board/samsung/exynos-mobile/exynos-mobile.env b/board/samsung/exynos-mobile/exynos-mobile.env index aa2e89afbac..33f767319b5 100644 --- a/board/samsung/exynos-mobile/exynos-mobile.env +++ b/board/samsung/exynos-mobile/exynos-mobile.env @@ -2,6 +2,11 @@ stdin=serial,button-kbd stdout=serial,vidconsole stderr=serial,vidconsole +blkmapcmd=blkmap create root; + blkmap map root 0 ${blkmap_size_r} linear ${blkmap_blk_ifname} ${blkmap_blk_dev} ${blkmap_blk_nr} + +preboot=run blkmapcmd + bootdelay=0 bootcmd=bootefi bootmgr; pause; bootmenu |