[coreboot-gerrit] Patch merged into coreboot/master: 37a1d6c AMD Hudson/Yangtze: Enable support for SATA port multipliers
gerrit at coreboot.org
gerrit at coreboot.org
Mon Aug 5 22:08:26 CEST 2013
the following patch was just integrated into master:
commit 37a1d6c9552b267c06c471cced5928d2385767e2
Author: Bruce Griffith <bruce.griffith at se-eng.com>
Date: Tue Jul 23 11:50:12 2013 -0600
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 at se-eng.com>
Reviewed-by: Martin Roth <martin.roth at se-eng.com>
Reviewed-by: Dave Frodin <dave.frodin at se-eng.com>
Reviewed-on: http://review.coreboot.org/3808
Tested-by: build bot (Jenkins)
See http://review.coreboot.org/3808 for details.
-gerrit
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