MPC8641D PCI-Express problem

Kumar Gala galak at
Tue Mar 25 23:55:52 EST 2008

On Mar 25, 2008, at 3:02 AM, Marco Stornelli wrote:
> Hi,
> do you remember my problem with the pci-express? I have an  
> mpc8641d_hpcn (rev. 2.0) board connected via pci-express with the  
> Xilinx ML555 evaluation board. I'm using the 2.6.24 kernel. I'm  
> observing this strange behavior:
> 1) I turn on the board and I stop the U-boot
> 2) I load the FPGA microcode
> 3) I start the system
> 4) I load the driver module and I read a version register in the FPGA
> 5) The system crashes with a "machine check exception: transfer  
> error ack signal"
> 6) reboot
> 7) same procedure (without load the FPGA again)
> 8) now I can read the registers!
> If I repeat the procedure again it doesn't work anymore. I think  
> it's a problem with pci-express controller. Have you got any  
> suggestions?
> Thanks.

Where are you loading the FPGA microcode (linux, u-boot)?  Also, is  
the FPGA the only device connected over PCIe?

- k

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