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Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.ext4 | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/doc/README.ext4 b/doc/README.ext4 new file mode 100644 index 000000000..b3ea8b776 --- /dev/null +++ b/doc/README.ext4 @@ -0,0 +1,46 @@ +This patch series adds support for ext4 ls,load and write features in uboot +Journaling is supported for write feature. + +To Enable ext2 ls and load commands, modify the board specific config file with +#define CONFIG_CMD_EXT2 + +To Enable ext4 ls and load commands, modify the board specific config file with +#define CONFIG_CMD_EXT4 + +To enable ext4 write command, modify the board specific config file with +#define CONFIG_CMD_EXT4 +#define CONFIG_CMD_EXT4_WRITE + +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 <interface> <dev[:part]> [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 <interface> <dev[:part]> [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 <interface> <dev[:part]> [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 |