Red Hat Bugzilla – Bug 208648
Kernel does not support VIA VT8251 Southbridge
Last modified: 2007-11-16 20:14:54 EST
On ASUS K8V-XE board I have got this message: VP_IDE: Unknown VIA SouthBridge, disabling DMA. The kernel does not allow DMA on IDE disks then: # hdparm -d1 /dev/hda HDIO_SET_DMA failed: Operation not permitted This seems that this southbridge is unsupported (is not on the list) and this simple patch should help: http://marc.theaimsgroup.com/?l=linux-ide&m=113269890009593&w=2
Created attachment 137440 [details] lspci on this system
Created attachment 137441 [details] lspci -n on this system
Created attachment 137444 [details] dmesg To get the working onboard LAN, I have to use acpi=off but then I'm getting a lot of messages: Losing some ticks... checking if CPU frequency changed. cpuspeed is not running, AMD K8 Coll'n'Quiet is disabled in the BIOS. The BIOS is the latest from the ASUS, kernel is 2.6.9-42.0.2.EL, CPU is Sempron 3100+ (this is not AM2 system).
Created attachment 142399 [details] Patch for 2.6.9-42.0.3.EL to enable VIA VT8251 Southbridge This is just adding another PCI ID to the kernel list for VIA VT8251 Southbridge.
Created attachment 142400 [details] Patch for 2.6.9-42.0.3.EL to enable VIA VT8251 Southbridge DMA This is just adding another PCI ID to the kernel list for VIA VT8251 Southbridge.
I've just fixed this in libata for the current kernel. I can confirm this patch is correct for the 8251 and the old IDE. Milan - if it isn't upstream yet care to post it to linux-ide/linux-kernel as well ?
Alan, it's upstream: ceef833bae05e393859f1946a9802fb61f0febdf Milan, Alan, did you performed tests on this hardware with this patch?
I'm running pretty bussy mailserver on this machine. Three IDE disks, all of them with DMA auto-on after the boot, hdparm shows over 50MB/sec, now 9 days uptime. This is the same machine as I opened the bug for (ASUS K8V-XE).
Comment on attachment 142399 [details] Patch for 2.6.9-42.0.3.EL to enable VIA VT8251 Southbridge Obsolete duplicate entry (FF2 hang/restart IIRC).
committed in stream U5 build 42.31. A test kernel with this patch is available from http://people.redhat.com/~jbaron/rhel4/
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
QE ack for RHEL4.5.
The kernel from http://people.redhat.com/jbaron/rhel4/ works OK (kernel-2.6.9-46.EL).
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2007-0304.html