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Altera_Forum
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9 years ago

Unable to access fpga regs from arm

Hi, i Compiled my own Linux Kernel using the Tutorial from the eekwiki ( https://eewiki.net/display/linuxonarm/de0-nano-soc+kit ). However when I try to access the fpga space i get a bus error....
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

You may want to try to mmap space from 0xFF200000 through /dev/mem. That gives you a neatly mapped address in user space that allows you to write to a peripheral through a pointer dereference. Try connecting a PIO to the hps lw-bridge in Qsys and assign some leds to it's output. That's the easiest way of testing I think.