Red Hat Bugzilla – Bug 208708
xen host kernel makes host serial ports unusable
Last modified: 2007-11-30 17:11:44 EST
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):
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
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.
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
*** This bug has been marked as a duplicate of 204825 ***