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authorBruce Griffith <bruce.griffith@se-eng.com>2013-07-23 11:50:12 -0600
committerStefan Reinauer <stefan.reinauer@coreboot.org>2013-08-05 22:08:25 +0200
commit37a1d6c9552b267c06c471cced5928d2385767e2 (patch)
tree3552e2373ddc4a24eac247d283d3960ccef915ca /src/mainboard
parent915714501bc411f83717b41ebf269fc82a5e9657 (diff)
AMD Hudson/Yangtze: Enable support for SATA port multipliers
This patch sets a bit in the Yangtze southbridge to enable the extra protocol necessary to handle port multiplier chips. This has been turned on during most of Kabini development without any notable impact. Olive Hill has an optional daughter board that incorporates Silicon Image Steel Vines chips. This change has been tested with and without the daughter board. This change can be regression tested using any Hudson-based motherboard, although it has no impact on boards with discreet Hudson/Bolton southbridges. This was tested for impact on SATA performance in the absence of a port multiplier using the IOZone benchmarks within the Phoronix Test Suite. A SATA 3 hard drive (6.0 Gbps) and an SSD were connected to the ports on Olive Hill without using the port multiplier card. The test results contained more run-to-run variation within the same configuration than was seen in the aggregate results comparing the interface with and without the port multiplier protocol additions. In other words, the test had less accuracy than the impact caused by turning on port multiplier support. Change-Id: Ie87873b093f3e2a6a5c83b96ccb6c898d3e25f72 Signed-off-by: Bruce Griffith <bruce.griffith@se-eng.com> Reviewed-by: Martin Roth <martin.roth@se-eng.com> Reviewed-by: Dave Frodin <dave.frodin@se-eng.com> Reviewed-on: http://review.coreboot.org/3808 Tested-by: build bot (Jenkins)
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