1. SATA usage in U-boot

  	There are two ways to operate the hard disk

  	* Read/write raw blocks from/to SATA hard disk
  	* ext2load to read a file from ext2 file system

  1.0 How to read the SATA hard disk's information?

  
  	=> 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 raw write the kernel, file system, dtb to a SATA hard disk?

  	Notes: Hard disk sectors are normally 512 bytes, so
  		0x1000 sectors = 2 MBytes

  	write 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 raw read the kernel, file system, dtb from a SATA hard disk?

  
  	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 an image from an ext2 file system in U-boot?

  	U-boot doesn't support writing to an ext2 file system, so the
  	files must be written by other means (e.g. linux).

  
  	=> 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