[CentOS-virt] What is the purpose setting console=hvc0 in the dom0 grub config?

Wed May 17 10:02:04 UTC 2017
Mark L Sung <xlord.sl at gmail.com>

Refer to console=hvc0 from (https://wiki.xen.org/wiki/Xen_FAQ_Console)which
is dedicated for domO after Xen kernel loaded, so if it hangs it means
somewhere the booting process with xen is not right.

Suggest you to close look at the dmsg or log for debugging. Hope that helps
and cheers.


On Wed, May 17, 2017 at 11:26 AM, Jerry <jerryubi at gmail.com> wrote:

> Howdy,
> I recently went through a frustrating experience trying to get Xen 4
> running on a CentOS 7 system.  After a fresh install, fully updating the
> system, rebooting, then trying to install Xen4CentOS it would fail to boot
> into the 4.9 kernel, sitting there with a blinking cursor indefinitely.
> I thought it was a failure with grub, but it turns out this was set in the
> grub config:
> So the kernel was loading successfully, but it was failing boot properly
> (hanging because it couldn't find the / file system, but that's a different
> story). Boot messages were not being displayed on my console because of the
> console=hvc0 setting, hampering the troubleshooting process.
> What is the purpose of setting console=hvc0?  I removed it so I could
> trouble shoot this problem, but I didn't re-add it and the system booted
> fine, Xen is working.  Is there something that depends on this?
> I always disable "rhgb quiet" on a fresh install because I don't like boot
> messages being hidden from me, and now this other thing does it.  I like
> details, I need the details, don't hide them from me.
> Thanks,
> Jerry
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