Bug 208708

Summary:	xen host kernel makes host serial ports unusable
Product:	[Fedora] Fedora	Reporter:	Frank Ch. Eigler <fche>
Component:	kernel-xen	Assignee:	Markus Armbruster <armbru>
Status:	CLOSED DUPLICATE	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	low
Version:	6	CC:	bstein, wtogami, xen-maint
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-03-28 13:54:38 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Frank Ch. Eigler 2006-09-30 15:48:34 UTC

Description of problem:
A fc6xen host kernel hides the host ttyS0/ttyS1 ports from the 8250*
drivers.  This makes any devices connected there, like UPSs or whatnot,
unreachable to the host OS.

Version-Release number of selected component (if applicable):
2.6.17-1.2630.fc6

How reproducible:
always

Steps to Reproduce:
1. examine dmesg log
2. note how 8250 driver is not loaded, even for ttyS1 ...
3. try to load 8250 driver, note it fails

Comment 1 Frank Ch. Eigler 2006-10-05 20:16:09 UTC

This may be a duplicate of bug #180126.
I'll test some of the dom0 hacks suggested there ("xencons=off", "sync_console")
and report back.

Comment 2 Frank Ch. Eigler 2006-10-06 02:06:03 UTC

Booting the dom0 kernel with xencons=tty, then manually loading the 8250 driver
works: it restores access to the host serial ports.  Should this be documented
or automated?

Comment 4 Markus Armbruster 2007-03-28 13:54:38 UTC


*** This bug has been marked as a duplicate of 204825 ***