4.9, 5.1 boot failure after install

[anubis]

On Sat, 27 Dec 2003 02:53 am, danl at solvnet.net wrote:
> Hello,
>
> I had 4.9 release working and did a clean install of 5.1 release over
> the 4.9 and ended up with boot failure after install. Using allBSD
> partition and standard MBR I get a missing operating system error. If I
> use the FreeBSD boot I just get "default F1" and a beep. Now trying to
> install the 4.9 gives the same results.
>
> I'm using a Mylex DAC960ptl (accelraid 250) with the primary disk
> setup as JBOD. I set the bootable disk as active but everytime I go
> back to config fdisk the flag is not set.
>
> I then upgraded and flashed the RAID card, reformatted the disks and
> tried a 4.9 install, again with the same results.
>
> Is there an issue with the DAC card geometry or BIOS? Or a subtle
> quirk that isn't documented yet?
>
> thanks,
> Dan
>
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I have had a similar problem.  I also couldnt get it to make the system 
bootable using the install cd.  I got around it by using the live filesystem 
cd.  I dont know how that they are different but it seemed to write out the 
changes when I asked not like as in the install disk.