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Altera_Forum's avatar
Altera_Forum
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8 years ago

Kernel Panic programing fpga from Linux

Hello Community,

I receive the following error when I want to program the fpga from Linux: 


fpga_manager fpga0: writing fpga.rbf to Altera SOCFPGA FPGA Manager
Unable to handle kernel NULL pointer dereference at virtual address 00000008

The full kernel log is in attachment: kernel-log.txt

The device tree is in attachment: device-tree.txt

The kernel defconfig is in attachment: kernel-deconfig.txt

Device-tree overlay file is in attachment: dtso.txt

I hope u can help me. Thanks in advance.

I use buildroot 2018.05 to build the device-tree, the kernel and all the rest for a Linux Embedded device.

I tried the following kernel versions: rel_socfpga-4.9.78-ltsi_18.07.01_pr and rel_socfpga-4.16_18.06.02_pr from https://github.com/altera-opensource/linux-socfpga but both have the same error.

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    8 years ago

    I think I found a workaround.

    This error is caused by 

    dtc -O dtb -o /tmp/dtbo -@ "$DTSO_FILE"
cat /tmp/dtbo > /sys/kernel/config/device-tree/overlays/default/dtbo

    Piping the content of the dtbo seems not to work anymore.

    The solution is to pipe the name of the dtbo file to the path argument of device-tree overlay. 

    dtc -O dtb -o /lib/firmware/dtbo -@ "$DTSO_FILE"
echo dtbo > /sys/kernel/config/device-tree/overlays/default/path