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qwitza's avatar
qwitza
Icon for Occasional Contributor rankOccasional Contributor
9 months ago

Cyclone 5 first boot linux crashes, howto debug?

Hello, We have a design with a Cyclone V FPGA. Some boards only boot after a reset following power-on. Problem: The Debian Linux with U-Boot boots from the SD card, but after approximately 10 seco...
Board Debug
Fpga Devkit
qwitza's avatar
qwitza
Icon for Occasional Contributor rankOccasional Contributor
4 months ago

Hello,

I've done some additional testing and wanted to share the current state:

  • The firmware is only written during U-Boot.

  • Occasionally, after powering on, I cannot access the bridge.

  • I'm using the devmem2 program with the following command:
    ./devmem2 0xff200000 w

  • Sometimes it works, but other times Linux crashes.

  • The last output I get is:

./devmem2 0xff200000 w
/dev/mem opened.

Any help would be greatly appreciated.