1. SATA usage in U-boot

	Two ways to operate the hard disk

	* Raw read/write block from/to SATA hard disk;
	* ext2load read file from ext2 filesytem in hard disk

1.0 How to know the information of SATA hard disk?

	=> sata info

SATA device 0: Model: ST3320620AS Firm: 3.AAD Ser#:		4QF01ZTN
	    Type: Hard Disk
	    Supports 48-bit addressing
	    Capacity: 305245.3 MB = 298.0 GB (625142448 x 512)

1.1 How to save the kernel, filesystem, dtb to SATA hard disk with raw?

	Notes: 0x1000 sectors = 2 MBytes

	wirte kernel
	=> tftp 40000 /tftpboot/uImage.837x
	=> sata write 40000 0 2000

	write ramdisk
	=> tftp 40000 /tftpboot/ramdisk.837x
	=> sata write 40000 2000 8000

	write dtb
	=> tftp 40000 /tftpboot/mpc837xemds.dtb
	=> sata write 40000 a000 1000

1.2 How to read the kernel, filesystem, dtb from SATA hard disk with raw?

	load kernel
	=> sata read 200000 0 2000

	load ramdisk
	=> sata read 1000000 2000 8000

	load dtb
	=> sata read 2000000 a000 1000

	boot
	=> bootm 200000 1000000 2000000

1.3 How to load image from ext2 filesystem in U-boot?

	U-boot doesn't support ext2 write to hard disk, so
	you have to write the image to hard disk under Linux env,
	before you load image from ext2 filesystem.

	=> ext2ls sata 0:1 /
	<DIR>	    4096 .
	<DIR>	    4096 ..
	<DIR>	   16384 lost+found
		 1352023 uImage.837x
		 3646377 ramdisk.837x
		   12288 mpc837xemds.dtb
		      12 hello.txt

	=> ext2load sata 0:1 200000 /uImage.837x

	=> ext2load sata 0:1 1000000 /ramdisk.837x

	=> ext2load sata 0:1 2000000 /mpc837xemds.dtb

	=> bootm 200000 1000000 2000000