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

From: Larry.Finger@xxxxxxxxxxxx
Date: Sat Nov 19 2005 - 14:27:33 EST

-------------- Original message ----------------------
From: Vojtech Pavlik <vojtech@xxxxxxx>
> On Sat, Nov 19, 2005 at 06:59:37PM +0000, Larry.Finger@xxxxxxxxxxxx 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-

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