Re: MPC8641D PCI-Express problem
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 Ok I can try but I'm using the U-Boot 1.3.0 provided by Freescale with the board, so I have to change the firmware, updating the U-Boot to the version 1.3.2 to use CONFIG_FSL_PCIE_RESET. However, I've had the same idea, but I check (with a warning) this case in the kernel function fsl_check_pcie_link() (where the kernel check the value of LTSSM) but I've never seen the warning during the start-up. ___ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
Re: MPC8641D PCI-Express problem
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 ___ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
MPC8641D PCI-Express problem
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. Marco ___ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
Re: MPC8641D PCI-Express problem
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 ___ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
Re: MPC8641D PCI-Express problem
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. \Marco ___ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
