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Subject: Re: 4.9, 5.1 boot failure after install
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danl@solvnet.net writes:

> 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?

Sounds more like you're not using the option to actually write out the
results to disk.  (W)rite, maybe?