Re: Can't enable DMA
Aaron wrote:
> On -4969-Fri, Jul 18, 2003 at 10:41:47PM -0500, Shyamal Prasad
<shyamal.prasad@sbcglobal.net> spake thus,
>
>> "Anthony" == Anthony Campbell <ac@acampbell.org.uk> writes:
>>
>> Anthony> On 18 Jul 2003, John Little wrote:
>> >> >I'm using 3.0r0 (2.4.18-bf2.4 kernel) with ASRock K7VT2
>> >> m/board and Maxtor >30GB ATA133 hard disk. >I tried switching
>> >> on DMA using hdparm -d1 /dev/hda but got the following >error
>> >> message:
>> >> >
>> >> >HDIO_SET_DMA failed: Operation not permitted
>> >> >
>>
>> Anthony> [snip]
>>
>> Anthony> Not sure if this will help, but with a VIA chipset I had
>> Anthony> to enable
>>
>> Anthony> CONFIG_BLK_DEV_VIA82CXXX=y
>>
>> Anthony> to get DMA to work.
>>
>>FYI to the original poster this option is set in 2.4.18-bf2.4.
>>
>>http://ftp.us.debian.org/debian/dists/woody/main/disks-i386/current/images-1.44/bf2.4/kernel-config
>>
>
>
> I've been having this same problem, but apparently my VIA version
> doesn't match 82CXXX, so I'm completely dead in the water for DMA (I
> know, VIA is bad). I want to buy a PCI IDE controller card that will
> support DMA, will this solve my problem? If so, what kind should I get
> so it will be Debian-compatible?
>
> Any suggestions? If someone out there is using Debian and a PCI IDE
> controller, I'd love to hear from you.
>
You need a newer kernel. Stock 2.4.18 wasn't up-to-date with VIA agp
chipsets -- Red Hat always patch their kernels with driver updates,
which is why your Red Hat system worked.
In fact there's a ton of VIA chipset updates between 2.4.20 and 2.4.21,
and more in 2.4.22pre. I am running 2.4.22pre5 on a KM266 chipset,
which is basically your KT266A with integrated video.
Your motherboard has the 8235 southbridge:
http://www.amptron.com/html/Motherboard_K7vt2_frame.html
It is working for me:
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 409M
agpgart: Detected Via Apollo Pro KM266 / KL266 chipset
agpgart: AGP aperture is 128M @ 0xd0000000
Uniform Multi-Platform E-IDE driver Revision: 7.00beta4-2.4
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller at PCI slot 00:11.1
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci00:11.1
ide0: BM-DMA at 0xac00-0xac07, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xac08-0xac0f, BIOS settings: hdc:DMA, hdd:pio
darjeeling:/data/debian/dists/extra# hdparm /dev/hda
/dev/hda:
multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 9964/255/63, sectors = 160086528, start = 0
busstate = 1 (on)
As you can see, my chipset is a KM266, not your KT266A, but the
southbridge chip that actually does the IDE is the same.
If upgrading to 2.4.21 doesn't work, come back to me. As a last resort,
contact Vojtech Pavlik <vojtech@suse.cz> as your syslog suggested -- I'm
looking at the source for 2.4.22pre5 and I'm a bit confused by the
KT266A detection; I wouldn't be amazed if there was a bug in there.
(I always build my own kernels with make-kpkg, so I don't know if .debs
are easily available for woody for the 2.4.21 kernel: can someone give
pointers if necessary? If not you'll have to do what I do: install
kernel-package and build from the kernel sources.)
Andrew McGuinness
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