Re: Can I hotplug any PCIE device (EP) directly to the RC once linux is alreday up?

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On Wed, May 12, 2010 at 10:40:00AM +0530, Pratyush Anand wrote:
> Hello All,
> 
> I have started to develop PCI express support in linux and u-boot for a new platform.
> I have some doubt about hotplug behaviour.
> 
> As I understand :
> 
>  PCIE link up (LTSSM) is enabled in boot loader(u-boot).
>  So link up and first device detection will happen there only.
> 
> Linux kernel does not do link up and expects all these enumerations to be done by boot-loader.
> 
> My system HW structure:
> 
> There is only a root-complex in my system (which supports hotplug )
> and no switch is connected downstream to this root complex's port.
> I connect my device(EP) directly to the root complex.
> 
> My quextion is 
> Can I connect any PCIE device (EP) directly to the RC once linux is alreday up?

If your hardware supports this, yes, you can.  Use the pci express
controller driver (hint, I think it only supports acpi at the moment...)

good luck,

greg k-h
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