Patch merged into coreboot/master: 563dc5e libpayload: New AHCI, ATA and ATAPI drivers

the following patch was just integrated into master:
commit 563dc5e980a6e9de9e55619932c96aac16c85632
Author: Nico Huber 
Date:   Thu Aug 30 15:36:57 2012 +0200

libpayload: New AHCI, ATA and ATAPI drivers

This adds a new interface for storage devices. A driver for ATA and
    ATAPI drives on AHCI host controllers comes along.

The interface is very simple and was designed to match FILO's needs.
    It consists of three functions:

void storage_initialize(void);
      Initializes controllers. Should be called once at startup.

storage_poll_t storage_probe(size_t dev_num);
         with typedef enum {
                POLL_NO_DEVICE      = -2,
                POLL_ERROR          = -1,
                POLL_NO_MEDIUM      =  0,
                POLL_MEDIUM_PRESENT =  1,
              } storage_poll_t;
      Looks for a drive with number dev_num (drives are counted from
      zero) and polls for a medium in the drive if appropriate.

int storage_read_blocks512(size_t dev_num,
                                 u64 start, size_t count,
                                 unsigned char *buf);
      Reads count blocks of 512 bytes from block start of drive dev_num
      into buf.

Change-Id: I1c85796b7f8e379ff3817a61b1837636b57e182b
    Signed-off-by: Nico Huber

Build-Tested: build bot (Jenkins) at Fri Oct 26 15:46:59 2012, giving +1
Reviewed-By: Stefan Reinauer  at Fri Oct 26 19:08:37 2012, giving +2
Reviewed-By: Peter Stuge  at Sat Oct 27 02:52:58 2012, giving +2
See http://review.coreboot.org/1622 for details.

-gerrit