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Altera_Forum's avatar
Altera_Forum
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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

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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

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Looks like checking the bridge status may not be a viable option... since the hang happen if the FPGA is misconfigured, perhaps another way is to use the HPS FPGA manager to ensure that the configuration is executed successfully?