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Peter Hardman wrote:
> On 13 Sep 2006 at 21:08, David Laight wrote:
> 
>> On Wed, Sep 13, 2006 at 05:17:01PM +0100, Peter Hardman wrote:
>>> NetBSD appears to install OK, but when I try to boot (pointing the BIOS
>>> to the correct drive with the BIOS boot menu) I get:
>>>  
>>> NetBSD MBR boot
>>> Error no operating system
>> That error message is output after the mbr code (ie the code in sector
>> 0 of the disk) has read the first sector of the partition (sector 63),
>> and discovered that either:
>> - the first byte read is a zero
>> or
>> - the last two bytes aren't 0x55,0xaa
>> which usually mean that there isn't any code there.
>>
>> Geometry issues are unlikely to be an issue (the BIOS can't be THAT broken!).
>> However if 'hexdump -C -n512 -s63b /dev/rwd1d' reports valid code, maybe
>> the BIOS is broken!
> 
> The cd doesn't have hexdump, and mounting the /usr slice and running from 
> there, (or from hexdump on a floppy)  hexdump fails with a syntax error - I guess it 
> must need something else beside the executable. I'll look into it later.
>> You might find that the mbr_ext bootcode (which always does LBA reads)
>> avoids any issued with the bios reading the wrong sector with CHS reads.
>> OTOH the mbr code you are using verifies that the geometry reported by
>> the bios converts the CHS value to in the mbr entry to the LBA value.
>>
> mbr_ext can't find the OS either...
> 
> I need to get hexdump working. I'll have to put the IDE drive back tomorrow and 
> run hexdump from there. I've not got into that level of detail yet. Its a nifty tool- you 
> can read the all the gory details in the mbr (or I could if my brain could dig out it's 
> 386 machine code reference :)

I experienced the same problem several months ago with a Supermicro 
P8SGA motherboard and SATA drive using the built-in ICH6 SATA 
Controller. I never resolved the problem.


-- 
John R. Shannon

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