Re: PCI hotplug question: resources

["Chris Brand" <Chris_Brand@spectrumsignal.com>]

>> But I have developed a PCI-card which is "not present" at boot time
>> because there is no firmware in the FPGA which is responsible for PCI
>> communication.
>
>So the question is valid: Is there a way under Linux to grab a bunch
>of PCI resources after the system is already running? Detach them
>again?

Well, I haven't done this under linux of PCI, but I have done it under
VxWorks and Windows2000 and CompactPCI. As I understand it, the PCI
configuration algorithm is the same for both PCI and CompactPCI, so it
should be do-able.

Essentially, what you're trying to do is to hotplug-insert the board,
but without physically inserting it. So the board won't be detected
automatically by the system, but you should be able to use the same
code hotplug uses to do the actual PCI configuration (I'm going to make the
assumption that your FPGA implements the necessary parts of PCI config
space correctly, per the spec). You just need some way of invoking that
code on demand, presumably from a user-space program of some kind.
Unfortunately, it's been a while since I looked at the linux hotplug code,
so I can't be more specific than that, but hopefully somebody else on
the list can...

Chris


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