Re: IDEDMA problems.

[Rogier Wolff]

Gabriel Paubert wrote:
> 
> 
> 
> On Wed, 3 Dec 1997, C. Scott Ananian wrote:
> 
> > > The 'unable to get irq 255' message is very suspicious -- I suspect that
> > > something is putting -1 into a byte somewhere...
> > 
> > I've narrowed this down to the function ide_setup_pci_device in the file
> > ide-dma.c (kernel 2.1.70):
> > --------
> > __initfunc(static void ide_setup_pci_device (byte bus, byte fn, unsigned
> > int bmiba, ide_pci_device_t *d))
> > {
> > 	unsigned int port, at_least_one_hwif_enabled = 0;
> > 	unsigned short base = 0, ctl = 0;
> > 	byte tmp = 0, pciirq = 0;
> > 	ide_hwif_t *hwif;
> > 
> > 	if (pcibios_read_config_byte(bus, fn, 0x3c, &pciirq))
> > 		pciirq = 0;	/* probe later if not set */
Add:
        /* This is for x86. Do other architectures use this device? */
	#define MAX_IRQ 15
	if (pciirq > MAX_IRQ) {
		printk ("Warning: Your bios gave your IDE chip IRQ%d which is invalid.\n", pciirq);
		pciirq = 0;
	}

(Untested code, use at your own risk.)

					Roger. 

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