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Diffstat (limited to 'doc/README.ext4')
| -rw-r--r-- | doc/README.ext4 | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/doc/README.ext4 b/doc/README.ext4 deleted file mode 100644 index 8ecd21eee3b..00000000000 --- a/doc/README.ext4 +++ /dev/null @@ -1,83 +0,0 @@ -U-Boot supports access of both ext2 and ext4 filesystems, either in read-only -mode or in read-write mode. - -First, to enable support for both ext4 (and, automatically, ext2 as well), -but without selecting the corresponding commands, enable one of the following: - - CONFIG_FS_EXT4 (for read-only) - CONFIG_EXT4_WRITE (for read-write) - -Next, to select the ext2-related commands: - - * ext2ls - * ext2load - -or ext4-related commands: - - * ext4size - * ext4ls - * ext4load - -use one or both of: - - CONFIG_CMD_EXT2 - CONFIG_CMD_EXT4 - -Selecting either of the above automatically selects CONFIG_FS_EXT4 if it -wasn't enabled already. - -In addition, to get the write access command "ext4write", enable: - - CONFIG_CMD_EXT4_WRITE - -which automatically selects CONFIG_EXT4_WRITE if it wasn't defined -already. - -Also relevant are the generic filesystem commands, selected by: - - CONFIG_CMD_FS_GENERIC - -This does not automatically enable EXT4 support for you, you still need -to do that yourself. - -Some sample commands to test ext4 support: - -1. Check that the commands can be seen in the output of U-Boot help: - - UBOOT #help - ... - ext4load- load binary file from a Ext4 file system - ext4ls - list files in a directory (default /) - ext4size - determine a file's size - ext4write- create a file in ext4 formatted partition - ... - -2. To list the files in an ext4-formatted partition, run: - - 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, run: - - ext4load <interface> <dev[:part]> [addr] [filename] [bytes] - - For example: - UBOOT #ext4load mmc 2:2 0x30007fc0 uImage - -4. To write a file to an 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 |