1This patch series adds support for ext4 ls,load and write features in uboot 2Journaling is supported for write feature. 3 4To enable support for the ext4 (and ext2) filesystem implementation, 5#define CONFIG_FS_EXT4 6 7If you want write support, 8#define CONFIG_EXT4_WRITE 9 10To Enable ext2 ls and load commands, modify the board specific config file with 11#define CONFIG_CMD_EXT2 12This automatically defines CONFIG_FS_EXT4 for you. 13 14To Enable ext4 ls and load commands, modify the board specific config file with 15#define CONFIG_CMD_EXT4 16This automatically defines CONFIG_FS_EXT4 for you. 17 18To enable ext4 write command, modify the board specific config file with 19#define CONFIG_CMD_EXT4 20#define CONFIG_CMD_EXT4_WRITE 21These automatically define CONFIG_FS_EXT4 and CONFIG_EXT4_WRITE for you. 22 23Also relevant are the generic filesystem commands, 24#define CONFIG_CMD_FS_GENERIC 25This does not automatically enable EXT4 support for you. 26 27Steps to test: 28 291. After applying the patch, ext4 specific commands can be seen 30 in the boot loader prompt using 31 UBOOT #help 32 33 ext4load- load binary file from a Ext4 file system 34 ext4ls - list files in a directory (default /) 35 ext4write- create a file in ext4 formatted partition 36 372. To list the files in ext4 formatted partition, execute 38 ext4ls <interface> <dev[:part]> [directory] 39 For example: 40 UBOOT #ext4ls mmc 0:5 /usr/lib 41 423. To read and load a file from an ext4 formatted partition to RAM, execute 43 ext4load <interface> <dev[:part]> [addr] [filename] [bytes] 44 For example: 45 UBOOT #ext4load mmc 2:2 0x30007fc0 uImage 46 474. To write a file to a ext4 formatted partition. 48 a) First load a file to RAM at a particular address for example 0x30007fc0. 49 Now execute ext4write command 50 ext4write <interface> <dev[:part]> [filename] [Address] [sizebytes] 51 For example: 52 UBOOT #ext4write mmc 2:2 /boot/uImage 0x30007fc0 6183120 53 (here 6183120 is the size of the file to be written) 54 Note: Absolute path is required for the file to be written 55 56References : 57 -- ext4 implementation in Linux Kernel 58 -- Uboot existing ext2 load and ls implementation 59 -- Journaling block device JBD2 implementation in linux Kernel 60