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authorNico Huber <nico.h@gmx.de>2024-06-02 18:07:17 +0200
committerAngel Pons <th3fanbus@gmail.com>2024-11-21 09:25:04 +0000
commit60f388f9845afdf50eb51f5a06f03cd6d72988b1 (patch)
tree61beaa56c4ee41fb96d553c0aad361e035147deb /util/lint/lint-stable-022-clang-format
parentcae704d236f6c473f29e2f08ad4ce80628d38e5a (diff)
nb/via/cx700: Implement FSB tuning
This northbridge provides a lot of knobs for fine-grained tuning of the FSB drivers. The programming manual calls this "Host AGTL+ I/O Driving Control". We program the known good values for use with a VIA C7 CPU, and warn about use with different CPUs. The numbers were pulled out of raminit of the original CX700 port. Originally, there was a write to 0x83 as well, to set bit 1 which triggers a soft reset of the CPU. It was amidst a table, so it seems unclear if it was put there intentionally. Change-Id: I24ba6cfaab2ca3069952a6c399a065caea7b49f2 Signed-off-by: Nico Huber <nico.h@gmx.de> Reviewed-on: https://review.coreboot.org/c/coreboot/+/82769 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
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