Messages in this thread |  | | Date | Sat, 05 Jan 2002 12:20:40 -0700 | From | Dmitri Pogosyan <> | Subject | Re: ASUS KT266A/VT8233 board and UDMA setting |
| |
Alan Cox wrote:
> > Some RH kernels (may include yours) deliberately disable UDMA3, 4 and 5 > > on any VIA IDE controller. I don't know why. Unpatch your kernel and > > it'll likely work. > > RH 2.4.2-x. That was before we had the official VIA solution to the chipset > bug. It was better to be safe than sorry for an end user distro. >
Yes, indeed. Seems RH-2.4.16-0.13 kernel still enforces disabling UDMA>2 for VIA, by means of setting cable type to 40w, even if 80w is present
#cat /proc/ide/via
------------ ---Primary IDE-----Secondary IDE------ Read DMA FIFO flush: yes yes End Sector FIFO flush: no no Prefetch Buffer: yes no Post Write Buffer: yes no Enabled: yes yes Simplex only: no no Cable Type: 40w 40w
If I force higher UDMA by ide0=ata66 kernel option, as discussed in RH bug 35274, ide0 zero is set to UDMA5 (not the cable though) and everything is working.
I'll file a bug against RH kernel.
Thanks everybody, Dmitri
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |