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The first steps to bring C7 and CX700 support back mainline. Most is
skeleton copied from the `min86' example.
The romstage entry is placed in the northbridge code, as that's where
we'll perform raminit. Support to read the FSB frequency is added right
away, same for a reset function (using CF9 reset), as both are required
for a minimal build test.
A mainboard VIA EPIA-EX is also introduced for build testing, and in
later stages boot testing as well.
Links:
DS: https://theretroweb.com/chip/documentation/via-cx700-datasheet-feb06-666c8b172d347554179891.pdf
PM: https://web.archive.org/web/20180616220857/http://linux.via.com.tw/support/beginDownload.action?eleid=141&fid=221
Change-Id: I66f678fae0d5a27bb09c0c6c702440900998e574
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82765
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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