When I boot Red Hat 7.2 with the normal BIOS of the Elite P6VEM3 mother board, the BIOS will set the irqs into the multimedia card and the card can work. I think the BIOS has no knowledge about the PCI-PCI bridge specs.
When I boot from linuxbios, if I don't set the irq_tables.c , nobody will set the irqs into the multimedia card. I will get the message: No IRQ Known for interrupt pin A of device 02:04.0. Please try using pci=biosirq
So I added that two lines into irq_tables.c blindly. And it works on Elite K7SEM. Now I want to use Elite P6VEM3, this time it does not work. The chipset of K7SEM is SiS730 and one of P6VEM3 is SiS630E. Is there some diffrent between the two southbridge of them?
Will working on the irq_tables.c solve the problem or I am on the wrong way ? Can you tell me what shall I do?
Thanks for your help. David Xiong
-----原始邮件----- 发件人: ollie lho [mailto:ollie@sis.com.tw] 发送时间: 2002年10月28日 17:35 收件人: David Xiong 抄送: 'David Xiong'; linuxbios@clustermatic.org 主题: Re: 答复: How to set irq_tables.c if apci-to-pci bridge needed
On Mon, 2002-10-28 at 17:14, David Xiong wrote:
Did you recalculate the checksum ??
Yes, the checksum has been recalculated.
Where did you get the idea to set the the table like this?
I do not know how the irqs routed. So I guess I can set the irq table. It is intresting that this way work on Elite K7SEM. So I take it for granted it will work on the new mother board. Am I wrong? Sorry for newbie questions like this.
Do you have any documentation about your bridge ?? How did you know if your bridge does not re-route IRQs in some other ways ??
I do not have any documentation. Can you tell me where can I start?
The way a PCI-PCI bridge should route the IRQs behind is defined in the PCI-PCI bridge spec. For you case, it IRQs are re-routed twice, one is by the bridge, the other is the southbridge IRQ router.
Ollie