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| -rw-r--r-- | doc/README.ext4 | 78 |
1 files changed, 51 insertions, 27 deletions
diff --git a/doc/README.ext4 b/doc/README.ext4 index 9a2de50..2b0eab5 100644 --- a/doc/README.ext4 +++ b/doc/README.ext4 @@ -1,53 +1,77 @@ -This patch series adds support for ext4 ls,load and write features in uboot -Journaling is supported for write feature. +U-Boot supports access of both ext2 and ext4 filesystems, either in read-only +mode or in read-write mode. -To enable support for the ext4 (and ext2) filesystem implementation, -#define CONFIG_FS_EXT4 +First, to enable support for both ext4 (and, automatically, ext2 as well), +but without selecting the corresponding commands, use one of: -If you want write support, -#define CONFIG_EXT4_WRITE + #define CONFIG_FS_EXT4 (for read-only) + #define CONFIG_EXT4_WRITE (for read-write) -To Enable ext2 ls and load commands, modify the board specific config file with -#define CONFIG_CMD_EXT2 -This automatically defines CONFIG_FS_EXT4 for you. +Next, to select the ext2-related commands: -To Enable ext4 ls and load commands, modify the board specific config file with -#define CONFIG_CMD_EXT4 -This automatically defines CONFIG_FS_EXT4 for you. + * ext2ls + * ext2load -To enable ext4 write command, modify the board specific config file with -#define CONFIG_CMD_EXT4 -#define CONFIG_CMD_EXT4_WRITE -These automatically define CONFIG_FS_EXT4 and CONFIG_EXT4_WRITE for you. +or ext4-related commands: -Also relevant are the generic filesystem commands, -#define CONFIG_CMD_FS_GENERIC -This does not automatically enable EXT4 support for you. + * ext4size + * ext4ls + * ext4load -Steps to test: +use one or both of: -1. After applying the patch, ext4 specific commands can be seen - in the boot loader prompt using - UBOOT #help + #define CONFIG_CMD_EXT2 + #define CONFIG_CMD_EXT4 + +Selecting either of the above automatically defines CONFIG_FS_EXT4 if it +wasn't defined already. + +In addition, to get the write access command "ext4write", use: + + #define CONFIG_CMD_EXT4_WRITE + +which automatically defines CONFIG_EXT4_WRITE if it wasn't defined +already. + +Also relevant are the generic filesystem commands, selected by: + + #define 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: -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 +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 a ext4 formatted partition. +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 + 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) |