PPC4xx: Add support for Korat PPC440EPx board

Hi Stefan and group,

These patches add support for the PPC440EPx-based "Korat" board to U-Boot. They are based primarily on the Sequoia board support.

I'm not expecting any action before the 1.3 release, but this is to give you a chance to look at the proposed changes and make suggestions and comments.

The list of changes below show the 28 files that I've patched for Korat. However, the 14 files marked with asterisks (*) are those that I have recently submitted, so I won't repeat them here.

 MAINTAINERS                  |    4 +
 MAKEALL                      |    1 +
 Makefile                     |    3 +
*board/amcc/sequoia/sdram.h   |    4 +-
 board/korat/Makefile         |   51 ++
 board/korat/config.mk        |   37 ++
 board/korat/init.S           |  123 ++++
 board/korat/korat.c          |  762 +++++++++++++++++++++++++
 board/korat/u-boot.lds       |  145 +++++
*board/lwmon5/sdram.h         |    4 +-
*common/cmd_mii.c             |    8 +-
*common/miiphyutil.c          |  282 +++++-----
*cpu/ppc4xx/Makefile          |   31 +-
*cpu/ppc4xx/denali_data_eye.c |  396 +++++++++++++
*cpu/ppc4xx/denali_spd_ddr2.c | 1276 ++++++++++++++++++++++++++++++++++++++++++
*cpu/ppc4xx/miiphy.c          |  143 ++++--
 dtt/Makefile                 |    2 +-
 dtt/lm73.c                   |  186 ++++++
 include/configs/korat.h      |  385 +++++++++++++
 include/dtt.h                |   12 +-
*include/miiphy.h             |  114 +++--
*include/ppc440.h             |  514 +++++++++++++++--
*post/board/lwmon5/Makefile   |   29 -
*post/board/lwmon5/ecc.c      |  267 ---------
*post/cpu/ppc4xx/Makefile     |    2 +-
*post/cpu/ppc4xx/denali_ecc.c |  266 +++++++++
 rtc/Makefile                 |    2 +-
 rtc/m41t60.c                 |  262 +++++++++
 28 files changed, 4732 insertions(+), 579 deletions(-)

Best regards,
Larry