I don't have a floppy drive in laptop. I just use command " fixmbr " in windows xp rescue console mode, then boot from the OpenBSD 4.5 install CD, and run "fdisk -e /dev/rwd0c" in shell, then "flag " the OpenBSD partition bootable. but boot failed, "ERR M"
2009/5/9 Steve Williams <st...@williamsitconsulting.com> > Feifei (??) wrote: > >> Hi, Nick, >> >> Thanks for you advices, >> I clear Grub from my MBR, and flag the OpenBSD partition bootable , but I >> also got a "ERR M" error code. >> Yes, I read "man biosboot", but I don't know how to resolve it. >> I try to reinstall OpenBSD 4.5 again , but it is the same error :(. >> >> 2009/5/7 Nick Holland <n...@holland-consulting.net> >> >> >> >>> Feifei (7I7I) wrote: >>> >>> >>>> Hi, guys, >>>> >>>> I just install the OpenBSD 4.5, but my grub configuration can't boot it. >>>> Before that, I use OpenBSD 4.2, it is a new installation, not upgrade. >>>> >>>> >>> ... >>> >>> >>>> It works well with the OpenBSD 4.2, >>>> >>>> But , if I use it to boot 4.5, I only get a error : >>>> Starting up ... >>>> Loading ... >>>> ERR M >>>> >>>> >>> man biosboot >>> will tell you what the error means. >>> http://www.openbsd.org/faq/faq14.html will show you how >>> the boot process works. I'm going to assume you read that >>> before I expect you to understand this: >>> >>> short version: the PBR read something, but it wasn't /boot. >>> >>> I'm not a grub expert, but obviously the PBR you are running >>> isn't the one that OpenBSD put into place. Some boot loaders >>> do silly things like store a copy of the real PBR somewhere >>> they think is cool, and when you reinstall the OS, the stored >>> PBR doesn't get replaced when the real one is. So now you have >>> the old PBR reading ...something other than /boot >>> >>> If you replace your grub boot loader with a normal MBR and flag >>> the OpenBSD partition as active, I bet the system will boot just >>> fine. >>> >>> Alternatively, do whatever voodoo you need to do to tell grub >>> there is a new PBR for it to use. >>> >>> Nick. >>> >>> >> > In the good old days, boot a DOS floppy, do a FDISK /MBR. Voilla. no need > to reinstall OpenBSD. Not sure what the equivalent would be today. > > Good Luck. > > Cheers, > Steve
