Re: latest current fails to mount root

["Steven M. Bellovin" <smb%cs.columbia.edu@localhost>]

On Tue, 01 Apr 2008 20:18:10 -0400
Greg Troxel <gdt%ir.bbn.com@localhost> wrote:

> I just rebuilt current for i386 and updated two notebooks.  One is
> fine, and the other won't boot, failing to find the root partition.
> (current from a week ok worked fine.)  It printed something about mbr
> partition extending beyond physical disk size after the kernel had
> probed devices, and was then in 'choose root device' mode.  I
> couldn't find the msg in the source so will boot it again and get the
> exact message.

Are you using SATA?  I had exactly that message until I switched my T61
to compatibility mode.  Manuel suspects a timing issue.

> 
> On this machine, I think the mbr is ok:
> 
> foobar gdt 11 /usr/home/gdt > dmesg|egrep wd0
> wd0 at atabus1 drive 0: <HTS541010G9SA00>
> wd0: drive supports 16-sector PIO transfers, LBA48 addressing
> wd0: 95396 MB, 193821 cyl, 16 head, 63 sec, 512 bytes/sect x
> 195371568 sectors wd0: drive supports PIO mode 4, DMA mode 2,
> Ultra-DMA mode 5 (Ultra/100) wd0(ahcisata0:0:0): using PIO mode 4,
> DMA mode 2, Ultra-DMA mode 5 (Ultra/100) (using DMA)
> 
> Disk: /dev/rwd0d
> NetBSD disklabel disk geometry:
> cylinders: 193821, heads: 16, sectors/track: 63 (1008
> sectors/cylinder) total sectors: 195371568
> 
> BIOS disk geometry:
> cylinders: 1023, heads: 240, sectors/track: 63 (15120
> sectors/cylinder) total sectors: 195371568
> 
> Partition table:
> 0: NetBSD (sysid 169)
>     bootmenu: foobar
>     start 63, size 195371505 (95396 MB, Cyls 0-12921/95/63), Active
> 1: <UNUSED>
> 2: <UNUSED>
> 3: <UNUSED>
> Bootselector enabled, timeout 10 seconds.
> 
> so that fits exactly.
> 
> foobar gdt 13 /usr/home/gdt > disklabel wd0d
> # /dev/rwd0d:
> type: unknown
> disk: HTS541010G9SA00
> label: 
> flags:
> bytes/sector: 512
> sectors/track: 63
> tracks/cylinder: 16
> sectors/cylinder: 1008
> cylinders: 193821
> total sectors: 195371568
> rpm: 3600
> interleave: 1
> trackskew: 0
> cylinderskew: 0
> headswitch: 0           # microseconds
> track-to-track seek: 0  # microseconds
> drivedata: 0 
> 
> 16 partitions:
> #        size    offset     fstype [fsize bsize cpg/sgs]
>  a:   1572801        63     4.2BSD   1024  8192 43768  # (Cyl.
> 0*-   1560*) b:   4718592   1572864       swap                     #
> (Cyl.   1560*-   6241*) c: 195371505        63     unused      0
> 0        # (Cyl.      0*- 193820) d: 195371568         0
> unused      0     0        # (Cyl.      0 - 193820) e: 189080112
> 6291456     4.2BSD   2048 16384 28952  # (Cyl.   6241*- 193820)
> 
> It's a thinkpad T60, but I don't think that matters.
> 


                --Steve Bellovin, http://www.cs.columbia.edu/~smb