* Added support for "fast" (64-clock) refresh

* Added support for "fast" (64-clock) refresh
* Added code to support remap window for 3 - 4 GB systems
* Fixed premature configuration of true row boundaries that resulted in some sections of DRAM not receiving JEDEC commands (see http://openbios.org/pipermail/linuxbios/2005-June/011752.html).
* Redefined RCOMP_MMIO so that RCOMP registers can be configured on systems where A20M# is asserted.
* Disabled subsystem (vendor) ID configuration
* #ifdef'd out suspicious looking code (see http://openbios.org/pipermail/linuxbios/2005-June/011759.html)
* Added optional run-time checking of dual-channel compatibility of installed DIMMs
* Move JEDEC SPD and SDRAM definitions into reusable #include files

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2048 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1