[PATCH v2 04/14] spl: ufs: add SPL_UFS_FS Kconfig and filesystem boot stub

[Varadarajan Narayanan]

On Sat, Jun 06, 2026 at 03:48:35PM +0530, Balaji Selvanathan wrote:
> Add a new SPL_UFS_FS Kconfig option to enable filesystem-based boot
> from UFS (FAT or EXT4). When selected, a UFS_MODE_FS case is added
> to the boot-mode switch in spl_ufs_load() raw mode on failure.
>
> The filesystem path is currently a stub that
> returns -ENOSYS, serving as a placeholder for future implementation.

Is this really needed? Can't this be added along with the actual support.

-Varada

>
> Signed-off-by: Balaji Selvanathan <balaji.selvanathan at oss.qualcomm.com>
> ---
> Changes in v2:
> - Added the filesystem support in SPL UFS as a seperate patch
> ---
> ---
>  common/spl/Kconfig   | 10 ++++++++++
>  common/spl/spl_ufs.c |  9 +++++++++
>  2 files changed, 19 insertions(+)
>
> diff --git a/common/spl/Kconfig b/common/spl/Kconfig
> index 82b757d1efa..8609f08413b 100644
> --- a/common/spl/Kconfig
> +++ b/common/spl/Kconfig
> @@ -1682,6 +1682,16 @@ config SPL_UFS_RAW_U_BOOT_PARTITION_NUM
>  	  with partition support. This is used if partition name is not
>  	  specified or not found.
>
> +config SPL_UFS_FS
> +	bool "Enable UFS filesystem boot mode"
> +	depends on SPL_UFS
> +	help
> +	  Enable filesystem-based boot from UFS. This allows loading
> +	  U-Boot from FAT or EXT4 filesystems on UFS partitions.
> +	  This is tried as a fallback if raw mode loading fails.
> +
> +	  Note: Filesystem support is not yet fully implemented.
> +
>  config SPL_WATCHDOG
>  	bool "Support watchdog drivers"
>  	imply SPL_WDT if !HW_WATCHDOG
> diff --git a/common/spl/spl_ufs.c b/common/spl/spl_ufs.c
> index 0590b796267..8a60948a304 100644
> --- a/common/spl/spl_ufs.c
> +++ b/common/spl/spl_ufs.c
> @@ -142,6 +142,15 @@ int spl_ufs_load(struct spl_image_info *spl_image,
>  			return 0;
>  #endif
>  		break;
> +#ifdef CONFIG_SPL_UFS_FS
> +	case UFS_MODE_FS:
> +		debug("spl: ufs: boot mode: fs\n");
> +
> +		/* TODO: Implement filesystem support */
> +		printf("spl: ufs: filesystem boot not implemented\n");
> +		ret = -ENOSYS;
> +		break;
> +#endif
>  	default:
>  		puts("spl: ufs: wrong boot mode\n");
>  	}
>
> --
> 2.34.1
>