update for CrayL1 board

* Patch by Pantelis Antoniou, 21 Apr 2003:
  add boot support for ARTOS (a proprietary OS)

* Patch by Steven Scholz, 11 Apr 2003:
  Add support for RTC DS1338

* Patch by Rod Boyce, 24 Jan 2003:
  Fix counting of extended partitions in diskboot command

  Add code for AmigaOne board
  (preliminary merge to U-Boot, still WIP)

* Patch by Jon Diekema, 12 Nov 2002:
  - Adding URL for IEEE OUI lookup
  - Making the autoboot #defines dependent on CONFIG_AUTOBOOT_KEYED
    being defined.
  - In the CONFIG_EXTRA_ENV_SETTINGS #define, the root-on-initrd and
    root-on-nfs macros are designed to switch how the default boot
    method gets defined.