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This patch series adds support for ZFS listing and load to u-boot.

To Enable zfs ls and load commands, modify the board specific config file with
#define CONFIG_CMD_ZFS

Steps to test:

1. After applying the patch, zfs specific commands can be seen
   in the boot loader prompt using
        UBOOT #help

        zfsload- load binary file from a ZFS file system
        zfsls  - list files in a directory (default /)

2. To list the files in zfs pool, device or partition, execute
        zfsls <interface> <dev[:part]> [POOL/@/dir/file]
        For example:
        UBOOT #zfsls mmc 0:5 /rpool/@/usr/bin/

3. To read and load a file from an ZFS formatted partition to RAM, execute
        zfsload <interface> <dev[:part]> [addr] [filename] [bytes]
        For example:
        UBOOT #zfsload mmc 2:2 0x30007fc0 /rpool/@/boot/uImage

References :
	-- ZFS GRUB sources from Solaris GRUB-0.97
	-- GRUB Bazaar repository

Jorgen Lundman <lundman at lundman.net> 2012.
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