Patch from Marc Singer

[if's replaced by ifdef's.]

While the BLOB boot loader doesn't support it, there are two others,
UBOOT and Logic's LOLO, that will initialize the SDRAM controller such
that the memory appears as a contiguous region.  This layout to be
required for WinCE and, thus, is the default for these loaders.  The
memory organization had been optimized for discontiguous blocks.  Now,
it supports a default mode that is compatible with all of the
bootloaders as well as options to optimize for either contiguous or
discontiguous models.

Withing, there is also a slight change to the way that the DEBUG_LL
macros select the UART address.  Now it uses immediate constants
exclusively.