mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-18 18:59:44 +00:00
83 lines
2.2 KiB
Text
83 lines
2.2 KiB
Text
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, use one of:
|
|
|
|
#define CONFIG_FS_EXT4 (for read-only)
|
|
#define 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:
|
|
|
|
#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:
|
|
|
|
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
|