Autodetect presence of serial flash and set up the board accordingly.

This enables us to have only one configuration and one set of code for
all revisions of the Gigabyte GA-M57SLI-S4.
Flash is now setup correctly for both SPI and LPC flash.

Detection of SPI flash in flashrom on rev. 2.x boards now hangs
instead of failing. However, that is just an effect of the combination
of incomplete initialization of the SPI controller and paranoid checks
in the flashrom SPI code.
If anyone wants to work on that, he needs a logic analyzer or creative
imagination. Hint: LPC-to-SPI read passthrough, clock signal.

Remaining issues for the M57SLI: Fan/environment control.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Harald Gutmann <harald.gutmann@gmx.net>


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2972 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

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