On Mar 25, 2008, at 8:03 AM, Marco Stornelli wrote:
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.
The issue may be related to the PCIe link training. Are you able to
access the FPGA in u-boot? Can you try reseting the PCIe controller
after you've loaded up the FPGA (see u-boot code in drivers/pci/
fsl_pci_init.c and look for CONFIG_FSL_PCIE_RESET)
- k
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