Hello.
Alan Cox wrote:
When IDE device works in legacy mode, the IRQ of IDE is fixed at 14/15
for the two channel. But IDE controller is a PCI device, OS will assign
an interrupt number for the PCI device in which IDE controller resides.
This is realized by calling ide_pci_enable, which will call
pcibios_enable_irq.
And pcibios_enable_irq should see interrupt in as 0 in that case. It also
Should doesn't mean it actually does. I've just looked at my 82801DB
configuration, see yourself:
[root@wasted etc]# lspci -x -s 0:1f.1
00:1f.1 IDE interface: Intel Corp. 82801DB ICH4 IDE (rev 02)
00: 86 80 cb 24 07 00 80 02 02 8a 01 01 00 00 00 00
10: 01 00 00 00 01 00 00 00 01 00 00 00 01 00 00 00
20: 01 f0 00 00 00 00 00 20 00 00 00 00 43 10 89 80
30: 00 00 00 00 00 00 00 00 00 00 00 00 09 01 00 00
The controller is in legacy mode (programming i/f is 0x8a), yet it
requests IRQ (interrupt pin = 1) and got assigned IRQ9.
MBR, Sergei
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