PCI hotplug supported on ARM (Kirkwood)? - fakephp?

[dk-arm-linux@gmx.de (Dieter Kiermaier)]

Am Freitag 13 November 2009 12:21:43 schrieb Dieter Kiermaier:
> Am Donnerstag 12 November 2009 20:01:32 schrieb Alexander Clouter:
> 
> > Dieter Kiermaier <dk-arm-linux@gmx.de> wrote:
> > > 
> > > is it possible to boot a FPGA which is connected to an PCI bus on a 
> > > kirkwood cpu (via a pcie->pci bridge) at runtime (I call it hotplug)?
> > > 
> > > And after booting the FPGA e.g. via slave serial protocol loading the 
> > > pci driver and access the device? This would be much easier to handle 
> > > than flashing the fpga using u-boot.
> > > 
> > > Is there any special framework I have to use? How can I tell the 
> > > kernel to reenumerate the bus and reasign the pci resources?
> > > 
> > > I have googled a lot and also tried to find something at newsgroups or 
> > > mailinglists but I haven't found some valuable information - at least 
> > > not for me ;). Is this possible?
> > > 
> > I tried tackling this on my board by creating a new 'bus' and trying to 
> > work around making the FPGA 'hotplugable' that way.  As the bus would 
> > know about the process of reprogramming the FPGA, it could cleanly 
> > unload and reload everything.
> > 
> > http://marc.info/?l=linux-kernel&m=124441477117607&w=2

Hm, your link seems to be down. Do you have a newer version of your code
somewhere?

> > 
> > Never did get it to work and no one expressed any real interest in it 
> > for the platform sadly; so I drifted off looking for other geeky things 
> > to do.
> > 
> > I am still personally keener on the bus model, but Geert suggested I 
> > lump for a MFD.
> 
> Hm, it looks like fakephp is what I was looking for but I see no way to compile
> this module on my arm (kirkwood).
> 

fakephp seems to be integrated / ported into the pci layer?
I have a /sys/bus/pci interface:

It is possible to deactivate devices by doing:
echo 1 > /sys/bus/pci/devices/0000\:01\:08.0/remove

But it looks like  there is no way of reactivating /rescanning it?

I've tried
echo 1 > /sys/bus/pci/rescan
but without any success.

Does anybody have an idea?

Many thanks,
Dieter





> Does anybody know a way to compile it?
> 
> Many thanks,
> Dieter
> 
> 
> 
> > 
> > Whatever you do, if you can keep me in the loop then I can nick your 
> > ideas/code and maybe get back into tinkering with my ARM board, that's 
> > if I stop bricking my MIPS boards :-/
> > 
> > Cheers
> > 
> 
> 
> 
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