MCP55 SATA solution to test

Pascal Hofstee caelian at
Mon Oct 26 14:41:59 UTC 2009

2009/10/25 Alexander Motin <mav at>:
> Hi.
> Thanks to one man who provided access to his machine, I seem to found
> how to fix device detection on nVidia MCP55 SATA controller on amd64
> 8.0. Looks like this controller need some time (very short) to enable
> BAR(5) memory access after PCI configuration register written. Probably
> some changes in PCI code exposed this issue. Also it explains why
> setting hw.pci.mcfg to 0 helps.
> Attached patch solves problem for that machine. Testers are welcome.

Confirmed this also fixes the SATA detection on my MSI K9N Neo on 9.0-CURRENT.
Please commit :)

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