On 3 May 2014 06:27, Martijn Rijkeboer <mart...@bunix.org> wrote: >> So marking a partition as 'Active/Bootable', (the 00 -> 80 change) >> causes your system to hang. Apparently Linux does this when you >> 'Label' it. The OpenBSD installer does it for you when you >> select 'Whole disk'. Nothing obviously to do with the disklabel. You >> could test this by manually >> setting the 'Active' flag on the working Linux MBR. Or, conversely >> unsetting the flag with fdisk >> after the OpenBSD install but before rebooting. In either case does it >> get further before noticing that it can't boot? > > > I did some testing with the following results: > > 1. Partition disk with Linux gparted and use cfdisk to set partition > type to A6 and OpenBSD disklabel to set disklabel. > (partition: 0; start: 2048; size: 1953519616) > - Bootflag off, no disklabel -> boot > - Bootflag on, no disklabel -> boot > - Bootflag off, with disklabel -> freeze > - Bootflag on, with disklabel -> freeze > > 2. Partition disk with OpenBSD fdisk + disklabel (installer start + size). > (partition: 3, start: 64; size: 1953520001) > - Bootflag off, no disklabel -> freeze > - Bootflag on, no disklabel -> freeze > - Bootflag off, with disklabel -> freeze > - Bootflag on, with diskalbel -> freeze > > 3. Partition disk with OpenBSD fdisk + disklabel (linux start + size). > (partition: 3: start: 2048; size: 1953519616) > - Bootflag off, no disklabel -> boot > - Bootflag on, no disklabel -> boot > - Bootflag off, with disklabel -> freeze > - Bootflag on, with disklabel -> freeze > > 4. Partition disk with OpenBSD fdisk with type 83 (installer start + size). > (partition: 3, start: 64; size: 1953520001) > - Bootflag off -> freeze > - Bootflag on -> freeze > > It looks like the motherboard doesn't like the partition to start at 64 and > it also doesn't like disklabels. > > Any suggestions on what to try next or should I just buy a different > motherboard? > > Kind regards, > > > Martijn Rijkeboer >
Looking around I found that one of my machines has a gigabyte GA-Z87-D3HP board, and I scrounged up a 1TB WD 10EARS disk. The disk was from another machine and had a working OpenBSD system. Lo and behold, plugged it into the GA-Z87-D3HP board and the system hung in the POST. Put the disk back on the other system, dd'ed /dev/zero over the disklabel, moved it back and the system booted. How extremely interesting. And weird. .... Ken
