Finally managed to replicate this and confirmed it also occurs on the Pi 4 8Gb, but *only when there's no monitor attached*. Stick a monitor on it, it works (which was the reason I having troubles reproducing this). Couldn't replicate it on the CM4, but did find another issue with the latest u-boot being unable to identify the eMMC device.
Anyway, this issue turns out to be caused by the addition of PCI support to the u-boot config; disable that and everything's fine again. I'm currently prepping a trivial patch to the hirsute version (and another one to fix the aforementioned CM4 issue), which we can then SRU if I haven't managed to break something *else* in the meantime :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1906552 Title: "Synchronous Abort" handler and reboot loop on rpi To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/u-boot/+bug/1906552/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs