Implement a function to change margin parameters. Haswell provides a
register to apply an offset to margin parameters during training, so
make use of it. There are other margin parameters that have not been
implemented yet, as they are not needed for now and special handling
is needed to provide offset training functionality.
Change-Id: I5392380e13de3c44e77b7bc9f3b819e2661d1e2d
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64195
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>
47f31f24d4