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This patch series adds support for ext4 ls,load and write features in uboot
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Journaling is supported for write feature.
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To enable support for the ext4 (and ext2) filesystem implementation,
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#define CONFIG_FS_EXT4
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If you want write support,
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#define CONFIG_EXT4_WRITE
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To Enable ext2 ls and load commands, modify the board specific config file with
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#define CONFIG_CMD_EXT2
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This automatically defines CONFIG_FS_EXT4 for you.
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To Enable ext4 ls and load commands, modify the board specific config file with
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#define CONFIG_CMD_EXT4
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This automatically defines CONFIG_FS_EXT4 for you.
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To enable ext4 write command, modify the board specific config file with
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#define CONFIG_CMD_EXT4
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#define CONFIG_CMD_EXT4_WRITE
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These automatically define CONFIG_FS_EXT4 and CONFIG_EXT4_WRITE for you.
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Also relevant are the generic filesystem commands,
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#define CONFIG_CMD_FS_GENERIC
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This does not automatically enable EXT4 support for you.
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Steps to test:
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1. After applying the patch, ext4 specific commands can be seen
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in the boot loader prompt using
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UBOOT #help
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ext4load- load binary file from a Ext4 file system
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ext4ls - list files in a directory (default /)
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ext4write- create a file in ext4 formatted partition
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2. To list the files in ext4 formatted partition, execute
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ext4ls <interface> <dev[:part]> [directory]
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For example:
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UBOOT #ext4ls mmc 0:5 /usr/lib
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3. To read and load a file from an ext4 formatted partition to RAM, execute
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ext4load <interface> <dev[:part]> [addr] [filename] [bytes]
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For example:
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UBOOT #ext4load mmc 2:2 0x30007fc0 uImage
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4. To write a file to a ext4 formatted partition.
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a) First load a file to RAM at a particular address for example 0x30007fc0.
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Now execute ext4write command
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ext4write <interface> <dev[:part]> [filename] [Address] [sizebytes]
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For example:
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UBOOT #ext4write mmc 2:2 /boot/uImage 0x30007fc0 6183120
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(here 6183120 is the size of the file to be written)
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Note: Absolute path is required for the file to be written
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References :
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-- ext4 implementation in Linux Kernel
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-- Uboot existing ext2 load and ls implementation
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-- Journaling block device JBD2 implementation in linux Kernel
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