On Fri, Feb 17, 2017 at 10:49:17AM -0600, Graham Allan wrote:
>
> I think that's a linux message.
>


Confirmed.

It is the linux kernel sources file arch/x86/boot/edd.c

After printing "Probing EDD", it issues BIOS int13 calls
getting some kind of disk information. Good place to be stuck
with funky bioses.

You can turn it all off by kernel command line "edd=off", the "Probing EDD" message
should go away. Leaving you with whatever previous message while the kernel
is stuck somewhere else (or not). Worth a try anyway.


K.O.


> I've seen this before when output
> starts getting redirected to the serial port (or ipmi/iDRAC/iLO
> virtual serial port). Maybe check if there is some type of console
> redirection set up in the BIOS? It seems to me that when redirection
> is set up, the BIOS itself and GRUB can output to both serial and
> regular console; once the kernel boots, messages only go to one or
> the other.
> 
> The "hang" (or rather change in output) doesn't have anything to do
> with the EDD message itself - it just happens that this is the last
> message printed during that particular phase of booting.
> 
> G.
> 
> On 2/17/2017 10:33 AM, Konstantin Olchanski wrote:
> >On Thu, Feb 16, 2017 at 10:07:55PM -0600, ~Stack~ wrote:
> >>I have a bunch of new SuperMicro servers. Installed 7.3 on it. Reboot and it hangs at:
> >>"Probing EDD (edd=off to disable)...ok"
> >
> >That's a BIOS message, not a linux or grub message, yes?
> >
> >(I do not see any EDD messages in the linux log files)
> >
> >Anyhow, *which* SuperMicro servers? (so I do not buy the same)
> >
> >>However, if I let it sit long enough it will boot (once one sat for an
> >>hour before it continued on, most of the time it is closer to 30-40
> >>minutes).
> >
> >The SuperMicro mobo/bios is notorious for slow booting, takes a good few minutes
> >from powerup to grub menu. But 30 min is extreme, yes.
> >
> >>If I boot into rescue kernel, it instantly boots. Every time. This is so
> >>puzzling to me.
> >
> >How do you mean? The "EDD" message is before grub menu or after grub menu?
> 
> -- 
> Graham Allan
> Minnesota Supercomputing Institute - [log in to unmask]

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada