From e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb Mon Sep 17 00:00:00 2001 From: Yang Zhang Date: Fri, 28 Aug 2015 09:58:54 +0800 Subject: Add qemu 2.4.0 Change-Id: Ic99cbad4b61f8b127b7dc74d04576c0bcbaaf4f5 Signed-off-by: Yang Zhang --- qemu/roms/u-boot/doc/README.ext4 | 59 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) create mode 100644 qemu/roms/u-boot/doc/README.ext4 (limited to 'qemu/roms/u-boot/doc/README.ext4') diff --git a/qemu/roms/u-boot/doc/README.ext4 b/qemu/roms/u-boot/doc/README.ext4 new file mode 100644 index 000000000..9a2de5088 --- /dev/null +++ b/qemu/roms/u-boot/doc/README.ext4 @@ -0,0 +1,59 @@ +This patch series adds support for ext4 ls,load and write features in uboot +Journaling is supported for write feature. + +To enable support for the ext4 (and ext2) filesystem implementation, +#define CONFIG_FS_EXT4 + +If you want write support, +#define CONFIG_EXT4_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. + +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. + +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. + +Also relevant are the generic filesystem commands, +#define CONFIG_CMD_FS_GENERIC +This does not automatically enable EXT4 support for you. + +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 [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 [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 [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 -- cgit 1.2.3-korg