RE: PCI interrupt queries

Welch, Martyn (GE EntSol, Intelligent Platforms)
2008-08-21T11:12:00Z

Rene Herman wrote:
> On 21-08-08 11:31, Welch, Martyn (GE EntSol, Intelligent Platforms)
> wrote:
>
>> Rajat Jain wrote:
>
>>> OK. But who does it in an embedded environment (PPC for eg) where
>>> there is no POST software. The first piece of code that gets
>>> executed is U-boot and then the kernel. So who writes the LINE
>>> value into the config space?
>>
>> U-boot does. There is a fairly standardised way to connect PCI
>> interrupt lines, especially for PCI slots where various cards can be
>> plugged in:
>
> How peculiar, a boot loader doing hardware programming...

On the PowerPC architecture u-boot acts as the equivalent of BIOS and a
bootloader on the x86 architecture.

Martyn

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