This patch series adds support for ext4 ls,load and write features in uboot Journaling is supported for write feature. To enable support for the ext4 (and ext2) filesystem implementation, #define CONFIG_FS_EXT4 If you want write support, #define CONFIG_EXT4_WRITE To Enable ext2 ls and load commands, modify the board specific config file with #define CONFIG_CMD_EXT2 This automatically defines CONFIG_FS_EXT4 for you. To Enable ext4 ls and load commands, modify the board specific config file with #define CONFIG_CMD_EXT4 This automatically defines CONFIG_FS_EXT4 for you. To enable ext4 write command, modify the board specific config file with #define CONFIG_CMD_EXT4 #define CONFIG_CMD_EXT4_WRITE These automatically define CONFIG_FS_EXT4 and CONFIG_EXT4_WRITE for you. Also relevant are the generic filesystem commands, #define CONFIG_CMD_FS_GENERIC This does not automatically enable EXT4 support for you. Steps to test: 1. After applying the patch, ext4 specific commands can be seen in the boot loader prompt using UBOOT #help ext4load- load binary file from a Ext4 file system ext4ls - list files in a directory (default /) ext4write- create a file in ext4 formatted partition 2. To list the files in ext4 formatted partition, execute ext4ls [directory] For example: UBOOT #ext4ls mmc 0:5 /usr/lib 3. To read and load a file from an ext4 formatted partition to RAM, execute ext4load [addr] [filename] [bytes] For example: UBOOT #ext4load mmc 2:2 0x30007fc0 uImage 4. To write a file to a ext4 formatted partition. a) First load a file to RAM at a particular address for example 0x30007fc0. Now execute ext4write command ext4write [filename] [Address] [sizebytes] For example: UBOOT #ext4write mmc 2:2 /boot/uImage 0x30007fc0 6183120 (here 6183120 is the size of the file to be written) Note: Absolute path is required for the file to be written References : -- ext4 implementation in Linux Kernel -- Uboot existing ext2 load and ls implementation -- Journaling block device JBD2 implementation in linux Kernel