DMA problem

Amorphis · n00b Joined: 16 Jul 2002 Posts: 30

I have seen some ppl experiencing problems when trying to turn DMA support on using INTEL 845G boards.

When trying to set DMA using hdparm i get:

> HDIO_SET_DMA failed: Operation not permitted

and i also get this error on my dmesg:

> PCI: Device 00:1f.1 not available because of resource collisions
> PCI_IDE: (ide_setup_pci_device:) Could not enable device.

After looking around for a while i found a thread about this problem:

http://lists.insecure.org/linux-kernel/2002/Jun/0044.html

and the patch to solve it :-)

http://lists.insecure.org/linux-kernel/2002/Jun/att-0538/01-andre.patch

Didn't have the opportunity to test it yet, will do as soon as I get at home!

klieber · Posted: Wed Jul 17, 2002 11:42 am Post subject:

Please post the results here when you find out how it works. Also, can you post what kernel flavor you patched it against? (i.e. gentoo-sources or vanilla-sources?)

--kurt
_________________
The problem with political jokes is that they get elected

Amorphis · n00b Joined: 16 Jul 2002 Posts: 30

Ok

I'm going to patch it against gentoo-sources. Probbably it will work with any 2.4.19 kernel sources as it's only a matter of adding the board model to the list of supported models. Only 5-6 lines to be added.

Moon · n00b Joined: 14 Jul 2002 Posts: 5

The patch mentioned by Amorphis seems to require a vanilla-kernel 2.4.18 patched up to 2.4.19-pre9 with ac3 applied. I was not able to make it run with the gentoo-sources.
So the steps required are:
1. emerge vanilla-sources
2. patch these with 2.4.19-pre9
3. apply Alan Cox's third patch for 2.4.19-pre9(=2.4.19-pre9ac3)
4. apply the custom patch posted by Amorphis

Some of these didn't work for me without modifying the Kernelconfig but that maybe caused by my limited knowledge of Kernelpatching in general

In the end i got a system with working DMA(Chipset is i845E, Board is ABIT-BD7II-Raid). The Problem seems to effect most of the newer i845 Chipsets(D,G,E etc.).

Summary: at least a little understanding of Kernel-compiling required, some steps are rather tricky

P.S.: Problem is NOT solved in 2.4.19-rc1(even though Changelog mentions i8xx Chipset patches)

Amorphis · n00b Joined: 16 Jul 2002 Posts: 30

I noticed the patch was not for the gentoo-sources but I was planning on patching the file by hand. Anyway when I got home i realized I had a different problem as my IDE controller is already identified by the kernel (the patch was for a different controller not present in the kernel sources).

Anyway i think this patch can solve some people problems with DMA.

extort · n00b Joined: 07 Oct 2002 Posts: 2

I was wondering if you ever found a solution to the i845G chipset problem with DMA mode and the resource conflict? I've been looking but I can't seem to find anything.

I'd really appreciate it if you would help me! PIO mode is horrible :cry:

pilla · Posted: Tue Oct 08, 2002 1:04 am Post subject:

Maybe this applies.

extort · n00b Joined: 07 Oct 2002 Posts: 2

Amorphis's patch on commenting out the return statement in pci-i386.c seems to fix my Intel i845G problem -- I can now set DMA mode. I modified the file in the gentoo-sources kernel with no other modifications (didnt emerge vanilla-sources or apply any other patches).

Thanks Amorphis, and I suggest anyone else with the problem first try using what he posted :wink:

Darth_Daver · n00b Joined: 22 Sep 2002 Posts: 44

I have an ASUS P4PE, and I was also getting these errors: