Re: UMC UM8886BF IDE DMA not usable
Mark Lord (mlord@pobox.com)
Sun, 07 Feb 1999 10:54:52 -0500
"Andre M. Hedrick" wrote:
>
> On Sun, 7 Feb 1999, David Monniaux wrote:
>
> > I've tried to have 2.2.1, with or without the IDE-UDMA patches, to use my
> > busmaster-capable IDE chipset.
> >
> > It refuses:
> >
> > Uniform Multi-Platform E-IDE driver Revision: 6.19
> > UM8886BF: IDE controller on PCI bus 00 dev 91
> > UM8886BF: not 100% native mode: will probe irqs later
> > UM8886BF: dma_base is invalid (0x0000, BIOS problem), please report to
> > <mj@ucw.cz>
> > ide0: UM8886BF Bus-Master DMA disabled (BIOS)
> > UM8886BF: dma_base is invalid (0x0000, BIOS problem), please report to
> > <mj@ucw.cz>
> > ide1: UM8886BF Bus-Master DMA disabled (BIOS)
> >
> > Now, there's NO switch in the BIOS that deals with UDMA. So there's no use
> > telling me "just fiddle with the BIOS settings". :-)
>
> I know there is not, so don't worry.
>
> > The /proc/pci entry for the IDE chipset is the following:
> > Bus 0, device 18, function 1:
> > IDE interface: UMC UM8886BF (rev 16).
> > Fast devsel. Master Capable. No bursts.
> > Non-prefetchable 32 bit memory at 0x1f0 [0x1f0].
> > Non-prefetchable unknown memory at 0x3f0 [0x3f6].
> > Non-prefetchable 32 bit memory at 0x170 [0x170].
> > Non-prefetchable unknown memory at 0x370 [0x376].
>
> There is no address space for DMA-Busmaster.
Therefore it is a problem in the Linux PCI support,
since this case should never happen nowadays.
I have copied Martin (PCI guy) on this, so he can have a look.
--
mlord@pobox.com
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