Re: DSM-G600 block issue

Dear Frank,

your suggestion is working, thanks a lot.
I will wait for netbsd 6 release~ ^^

2012/2/9 Frank Wille <[email protected]>

> On Thu, 9 Feb 2012 15:02:48 +0900
> "Toru Nishimura" <[email protected]> wrote:
>
> > > wd0 at atabus0 drive 0
> > > wd0: <WDC AC28400R>
> > > wd0: 8063 MB, 16383 cyl, 16 head, 63 sec, 512 bytes/sect x 16514064
> > > sectors boot device: wd0
> > > root on wd0a dumps on wd0b
> > > root file system type: msdos
> > >
> > > Then I always block here, no success boot my dsmg600.
> >
> > It seems the kernel misunderstands the disk has FAT filesyste
> > inside, with unknown reason.
>
> When mounting a generic root filesystem the kernel will check for a valid
> msdos filesystem before it checks for ffs.
>
> Your wd0a partition starts at block 63 and newfs(8) doesn't seem to
> overwrite the first block. So the kernel is confused when it still finds
> an MSDOS boot sector in block 63.
>
> Just a few days ago I had the same problem with a disk which was previously
> Linux ext2fs formatted. The ext2fs signature was still present after newfs,
> so the kernel tried to mount an ext2fs file system.
>
> Izumi Tsutsui committed a patch for it:
> http://mail-index.netbsd.org/source-changes/2012/02/07/msg031583.html
>
> Maybe we need a similar patch for an msdos boot sector?
>
>
> For testing, you can select the filesystem manually. Enter the interactive
> mode in altboot, then type:
>
> bootargs> askroot wd0:
>
> The kernel will stop and ask you for the root filesystem type. Then
> enter "ffs". The system will boot.
>
>
> To be on the safe side you should follow Toru's instructions and reinstall
> the system. Alternatively you might try to overwrite block 63 only, which
> would save you from reinstalling:
>
> # dd if=/dev/zero of=/dev/rwd0c bs=512 seek=63 count=1
> (untested!)
>
> --
> Frank Wille
>