Re: DMA mode locked off when via82cxxx ide driver built as module in 2.6.14

[Vojtech Pavlik <vojtech@suse.cz>]

On Sat, Nov 19, 2005 at 07:23:43PM +0000, Larry.Finger@lwfinger.net wrote:
> 
>  -------------- Original message ----------------------
> From: Vojtech Pavlik <vojtech@suse.cz>
> > On Sat, Nov 19, 2005 at 06:59:37PM +0000, Larry.Finger@lwfinger.net wrote:
> > > My HP ze1115 notebook uses the via82cxxx ide driver. If I configure the kernel 
> > build to make that driver as a module, the driver is correctly added to initrd 
> > and is loaded at boot time; however, DMA mode is turned off. It cannot be turned 
> > on even if I use an 'hdparm -d1 /dev/hda' command.
> > > 
> > > Is this a bug, or do I need some kind of IDE=XXX boot command? As expected, 
> > system performance in this mode is horrible.
> >  
> > What chipset does your notebook use? 'lspci -vv' should give a good
> > answer.
> 
> Portion of output of lspci -vv:
>  
> 00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
>         Subsystem: Hewlett-Packard Company: Unknown device 0022
>         Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
>         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
>         Latency: 64
>         Region 4: I/O ports at 1100 [size=16]
>         Capabilities: [c0] Power Management version 2
>                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
>                 Status: D0 PME-Enable- DSel=0 DScale=0 PME-
 
I need the portion for the ISA bridge, surprisingly, to know.

-- 
Vojtech Pavlik
SuSE Labs, SuSE CR