Implement boot device r/w functions for vboot

Implement boot device r/w functions for vboot

BUG=None
TEST=Manual

Test procedure:
1. Compile with VBOOT_DEBUG flag on successfully
2. Run u-boot on dev board as follows:
(Assume you have mmc device on dev board)
CrOS> mmc init
CrOS> cros bootdev set mmc 1
CrOS> cros bootdev
(info of mmc1)
CrOS> read mmc 1 0x20000000 1 2
CrOS> md.b 0x20000000
(mmc1 content)
CrOS> cros bootdev read 0x20001000 1 2
CrOS> md.b 0x20001000
(mmc1 content)
CrOS> cmp.b 0x20000000 0x20001000 0x400
(compare the blocks, should be identical)

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=edbc535

[robotboy, 2010-10-25 16:40:48]

LGTM, with the one change below.

http://codereview.chromium.org/4001006/diff/1/6
File include/config_cmd_all.h (right):

http://codereview.chromium.org/4001006/diff/1/6#newcode26
include/config_cmd_all.h:26: #define CONFIG_CMD_CROS		/* Chrome OS verify boot
support*/
I think it makes more sense for this to be in include/configs/chromeos/common.h

[Che-Liang Chiou, 2010-10-26 00:39:34]

http://codereview.chromium.org/4001006/diff/1/6
File include/config_cmd_all.h (right):

http://codereview.chromium.org/4001006/diff/1/6#newcode26
include/config_cmd_all.h:26: #define CONFIG_CMD_CROS		/* Chrome OS verify boot
support*/
On 2010/10/25 16:40:48, robotboy wrote:
> I think it makes more sense for this to be in
include/configs/chromeos/common.h

Yes, it is.  Thanks.

[Randall Spangler, 2010-10-26 20:27:46]

LGTM