1This patch series adds support for ext4 ls,load and write features in uboot 2Journaling is supported for write feature. 3 4To Enable ext2 ls and load commands, modify the board specific config file with 5#define CONFIG_CMD_EXT2 6 7To Enable ext4 ls and load commands, modify the board specific config file with 8#define CONFIG_CMD_EXT4 9 10To enable ext4 write command, modify the board specific config file with 11#define CONFIG_CMD_EXT4 12#define CONFIG_CMD_EXT4_WRITE 13 14Steps to test: 15 161. After applying the patch, ext4 specific commands can be seen 17 in the boot loader prompt using 18 UBOOT #help 19 20 ext4load- load binary file from a Ext4 file system 21 ext4ls - list files in a directory (default /) 22 ext4write- create a file in ext4 formatted partition 23 242. To list the files in ext4 formatted partition, execute 25 ext4ls <interface> <dev[:part]> [directory] 26 For example: 27 UBOOT #ext4ls mmc 0:5 /usr/lib 28 293. To read and load a file from an ext4 formatted partition to RAM, execute 30 ext4load <interface> <dev[:part]> [addr] [filename] [bytes] 31 For example: 32 UBOOT #ext4load mmc 2:2 0x30007fc0 uImage 33 344. To write a file to a ext4 formatted partition. 35 a) First load a file to RAM at a particular address for example 0x30007fc0. 36 Now execute ext4write command 37 ext4write <interface> <dev[:part]> [filename] [Address] [sizebytes] 38 For example: 39 UBOOT #ext4write mmc 2:2 /boot/uImage 0x30007fc0 6183120 40 (here 6183120 is the size of the file to be written) 41 Note: Absolute path is required for the file to be written 42 43References : 44 -- ext4 implementation in Linux Kernel 45 -- Uboot existing ext2 load and ls implementation 46 -- Journaling block device JBD2 implementation in linux Kernel 47