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doc: Updated README.ext4 

Clean up the ext4 README file.

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
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Robert P. J. Day 2016-04-13 18:30:16 -04:00 committed by Tom Rini
parent 3349ed3faa
commit 28983f4b1a
1 changed files with 51 additions and 27 deletions
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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:
#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:
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 /)
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)