Messages in this thread | | | Date | Sun, 7 Feb 1999 22:01:01 +0100 | From | Martin Mares <> | Subject | Re: UMC UM8886BF IDE DMA not usable |
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Hello,
> > > 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.
In this case, it's surely a hardware problem -- look at the /proc/pci entry above to see that the device is claiming these are _memory_ regions, not I/O regions (!!), so I completely understand that the kernel didn't assign any I/O addresses to it. :-|
Probably the only thing we can do is to add an exception to the PCI probing code to circumvent this bug. I'll look at it tomorrow.
Have a nice fortnight -- Martin `MJ' Mares <mj@ucw.cz> http://atrey.karlin.mff.cuni.cz/~mj/ Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth "Is there a life before death?"
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