MicroVax II

On Sat, Jul 30, 2016 at 2:38 AM, Mouse <mouse at rodents-montreal.org> wrote: The Micro VAX II supports mop booting so you can boot NetBSD entirely diskless with an NFS from a BSD or Linux NFS server just fine. This is supported right up to current versions of NetBSD though I recommend NetBSD 6.1.5. Later versions have bugs GCC which cause massive headaches. Even the GCC in 6.1.5 is a bit buggy. I had to recompile awk with -O0 or else various I followed: http://www.netbsd.org/docs/network/netboot/ I forget where I diverged from it so if you run into any issues just ask and I'll check what I did. The hardest part was getting mopd on Linux to serve up the NetBSD boot loader properly. The mopd for Linux didn't support ELF images and the NetBSD boot loader isn't in mopd format in more recent versions of NetBSD like it was in older versions. Now it's just ELF. But it's finally working. If you use NetBSD to serve mopd this isn't an issue. If you want to use Linux I can send you an mopd format copy of the boot loader. There are lots of advantages of booting diskless but my main motivation was that older hard drives can be quite noisy. The Vaxstation without a drive is fairly quiet, the only noise is the power supply fan. Also they're moving parts that often fail and can be quite small. Having 20G of space for my root filesystem is quite handy too and now I can easily take lvm snapshots, backups, etc so if this Vaxstation dies I could perhaps find another and netboot it from the same root. I should be able to boot simh from the same root too though I haven't tried that. I'm not sure simh supports mopd so I might need to create a boot device that remounts NFS over it. -- greg