Hello, Shane. Sorry about the delay. Got caught up in other stuff. Shane Huang wrote: > Quoting Tejun: >> Uh-oh, wait a bit. Nope. Until we figure out what the something >> else > is >> and positively verify 64bit DMA works fine, the quirk stays in. > > Our HW engineer has confirmed that our SB600 SATA controller indeed > has some MSI issue, and we do not have any workaround. > > The workaround "quirk_msi_intx_disable_bug" to SB700 SATA controller > can NOT work to SB600 SATA controller in my debug, while disablement > to RS690 MSI in kernel source can fix it. Hmmm... Okay. Is the SB600 SATA controller culprit or the north bridge - RS690? If the former is the case, proper way to work around it is to add AHCI_HFLAG_NO_MSI for SB600 AHCI. > As to the SB600 64 bit DMA capacity, do you have any methods to do > further verification? I do NOT find any problem in my debug after I > disabled RS690 MSI in kernel 2.6.24-rc7. The problem is that we didn't actually prove anything. In the tests you've done, pci=nomsi didn't fix the problem but disable_all_msi quirk did. pci=nomsi and disable_all_msi quirk are identical. Also, Srihari's problem was not reproduced, so currently we can't say much from the test results. Srihari, do you still have the system around? Thanks. -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
