[coreboot] [PATCH]compareboard utility

[Patrick Georgi]

Hi,

attached patch adds the compareboard utility, which compares a kbuildall
build's variables with those of an abuild build.

The previous version which I used so far only looked for existance of
variables (and had a bug for AMD boards, so some of them lack a bunch of
crucial values, sorry about that).
This version also tells you the values, but converts them from hex to
integer first. While this is not very helpful for vendor/device id pairs
and addresses, it helps because it eliminates "0xa" vs. "10" issues.

It hooks up to kbuildall, so just running it leads to abuild being
called (warning: large set of large trees around), and compares their
output.
The results are dumped to stdout and stored as
kbuildall.results/$boardname.variables.txt

Starting from these diffs, it should be easier to make board
configurations in kconfig more correct.

Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>

Patrick
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