doc/README.ext4

   1 This patch series adds support for ext4 ls,load and write features in uboot
   2 Journaling is supported for write feature.
   3
   4 To Enable ext2 ls and load commands, modify the board specific config file with
   5 #define CONFIG_CMD_EXT2
   6
   7 To Enable ext4 ls and load commands, modify the board specific config file with
   8 #define CONFIG_CMD_EXT4
   9
  10 To enable ext4 write command, modify the board specific config file with
  11 #define CONFIG_CMD_EXT4
  12 #define CONFIG_CMD_EXT4_WRITE
  13
  14 Steps to test:
  15
  16 1. 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
  24 2. 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
  29 3. 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
  34 4. 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
  43 References :
  44         -- ext4 implementation in Linux Kernel
  45         -- Uboot existing ext2 load and ls implementation
  46         -- Journaling block device JBD2 implementation in linux Kernel