[U-Boot] Support patches for the eXMeritus HWW-1U-1A system (v3)

[Kyle Moffett]

Hello again everyone!

After a relatively long hiatus working on other projects, I'm resubmitting
updated versions of our board-support patches for review and inclusion.

This patch series is based off the latest master branch as of Feb 11th,
specifically, commit d1a79b71f7c5fd9e277e0feb35f049289df1ed0e.

This patch series includes several generic cleanups, enhancements, and
bugfixes, but the vast majority of the code is board-specific.

See the specific patches for further details.

Overall diffstat below:

 MAINTAINERS                                     |    4 +
 arch/powerpc/cpu/mpc85xx/cpu.c                  |    7 +-
 arch/powerpc/cpu/mpc8xxx/ddr/ddr2_dimm_params.c |   34 +-
 arch/powerpc/cpu/mpc8xxx/ddr/ddr3_dimm_params.c |   37 +-
 arch/powerpc/cpu/mpc8xxx/ddr/util.c             |   58 ++-
 arch/powerpc/include/asm/mpc85xx_gpio.h         |  124 +++++
 arch/powerpc/lib/Makefile                       |   28 +-
 arch/powerpc/lib/_ashldi3.S                     |   45 ++
 arch/powerpc/lib/_ashrdi3.S                     |   47 ++
 arch/powerpc/lib/_lshrdi3.S                     |   45 ++
 board/exmeritus/hww1u1a/Makefile                |   54 ++
 board/exmeritus/hww1u1a/ddr.c                   |   51 ++
 board/exmeritus/hww1u1a/gpios.h                 |   81 +++
 board/exmeritus/hww1u1a/hww1u1a.c               |  629 +++++++++++++++++++++++
 board/exmeritus/hww1u1a/law.c                   |   34 ++
 board/exmeritus/hww1u1a/tlb.c                   |  106 ++++
 boards.cfg                                      |    2 +
 common/ddr_spd.c                                |    2 +-
 common/fdt_support.c                            |    2 +-
 include/configs/HWW1U1A.h                       |  470 +++++++++++++++++
 include/ddr_spd.h                               |   28 +-
 21 files changed, 1826 insertions(+), 62 deletions(-)