I've confirmed that 5.4 gives 'permission denied' and 5.3 seems to work fine. I suspect that this is due to the lockdown patches in 5.4.
** Changed in: linux-raspi (Ubuntu Focal) Status: Triaged => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1889926 Title: Can't access gpio mapped memory on focal armhf server on pi To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1889926/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs