thank you! Marc what is the scheme of of the pci scanning? when a new pci device is detected, all the pci device are re-scanned? for example,bridge 00:14.4 is scanned two times. there is a vga device connected to this bridge and the vga is allocted different bus number in the scanning. so I don't think it is resonable.
Thank youi!
On Thu, Sep 27, 2012 at 1:15 AM, Marc Jones marcj303@gmail.com wrote:
On Wed, Sep 26, 2012 at 4:14 AM, 王思源 wangsiyuanbuaa@gmail.com wrote:
it seems that the pci devices are scanned two rounds in our mainboard. first round: bus 0 -> bridge 00:14.4 -> bus 1 (this is the vga device under the bridge 00:14.4) second round: bus 0 -> bridge 00:02.0 -> bridge 00:04.0 -> bridge 00:05.0. this bridges are all pcie bridges.
I want to know whether the two rounds scanning style is right. if it is designed to scan two rounds, why? any reply is helpful to me. thank you!
Yes, there are multiple steps in device tress and pci resource discovery and allocation.
WANG Siyuan
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王思源