MPC8641D PCI-Express problem

Marco Stornelli marco.stornelli at
Wed Mar 26 00:03:50 EST 2008

Kumar Gala ha scritto:
> 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
I load the FPGA with JTAG and with a Xilinx program without a specific 
linux driver or u-boot. Yes, it is the only device connected over PCIe.


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