Hi Axel! Could you please retest with the latest ISO image for sparc64 [1] and check whether this issue has been resolved for you now?
We have fixed a lot of issues around GRUB on sparc64, both upstream and in Debian and I'm confident that GRUB should work now out of the box even on your UltraSPARC 10. FWIW, there are currently some issues with 5.x on older UltraSPARC machines but these should not affect this bug report. If GRUB works for you on sparc64 after testing the image, please consider closing this bug report. Adrian > [1] > https://cdimage.debian.org/cdimage/ports/2020-04-19/debian-10.0-sparc64-NETINST-1.iso -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaub...@debian.org `. `' Freie Universitaet Berlin - glaub...@physik.fu-berlin.de `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913