6.4 RC1 locks up solid on first reboot

John Baldwin jhb at freebsd.org
Mon Oct 27 09:02:58 PDT 2008

On Friday 24 October 2008 02:48:13 pm Jo Rhett wrote:
> So I booted up by CD and used Fixit mode to switch the system to boot  
> via serial (keyboard detached), but this gathered me even less.
> /boot.config: -Dh
> Consoles: internal video/keyboard  serial port
> BIOS drive A: is disk0
> BIOS drive C: is disk1
> BIOS drive D: is disk2
> BIOS 639kB/4062144kB available memory
> FreeBSD/i386 bootstrap loader, Revision 1.1
> (root at dessler.cse.b
> Plugging back in the monitor after lockup showed only a single char  
> more:
> (root at dessler.cse.bu

This confirms it is hanging in one of the two BIOS routines to output a 
character.  One thing you can do would be to boot up and do the following:

dd if=/dev/mem bs=0x400 count=1 of=idt.out
dd if=/dev/mem bs=64k iseek=15 count=1 of=bios.out

Then place those files some place I can fetch them.  You might also play with 
any BIOS settings you have for serial console redirection to see if they make 
a difference.

John Baldwin

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