Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Check FPGA / bridges before accessing them

I want to access the switches on the tersIC DE0-Naoo-SoC board from Linux. I load the appropriate FPGA and access the LW bridge (with a c program). Everything works fine. But if, due to eg. mis...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

Hi sunshine,

the bridges are enabled:

root@jwde0soc:~# cat /sys/class/fpga-bridge/lwhps2fpga/enable

1

root@jwde0soc:~# cat /sys/class/fpga-bridge/hps2fpga/enable

1

root@jwde0soc:~# cat /sys/class/fpga-bridge/fpga2hps/enable

1

Still the program hangs when reading from an lwhps2fpga-Address (mapped with /dev/mem).

Joachim