Console Redirection After Boot
Brian A. Seklecki
bseklecki at collaborativefusion.com
Fri Nov 3 18:27:59 UTC 2006
On Wed, 2006-11-01 at 09:08 -0600, Matt Domsch wrote:
> On Wed, Nov 01, 2006 at 10:37:01AM -0400, eclark wrote:
> > there any way to force serial console redirection in the kernel, so I can log
> > boot sequences? It gets a bit old having to continuously reboot to stare at
> > scrolling messages when you are trying to do kernel testing.
Just for the record, I just tested:
- An Intel Server Motherboard SE7520*
- A Dell PE2950
- An Axiomtek SBC83672
All have Phoenix BIOS. All exhibit the same behavior. I/O to the
console does not get redirected to serial _unless_ it was sent there via
a BIOS call. Ah la, DOS.
The only options are:
- Write a framebuffer driver for the kernel that uses BIOS calls (_not
likely_, and for which there would most presumably be no terminal
disciplines capable of running sysint/sysinstall)
- Convince hardware vendors like Dell/Intel to implement a more Real
Weasel-like console redirection system (not likely)
- Convince Dell not to re-write the ActiveX applet that is the DRAC5
interface in something slight more portable, such as...oh, Java.
- During emergency scenarios like DRP deployment, have a Windows system
- Buy an OpenBoot enabled platform. =p J/K
#3 seems most logical. Well at least now I understand the problem in
its entirely. Thanks all.
> That's easy.
> 1) Disable (or really, don't enable) console redirection in BIOS SETUP.
> 2) Put on the kernel command line: console=ttyS0,115200 console=tty0
> We do 99% of our kernel debugging this way.
Brian A. Seklecki <bseklecki at collaborativefusion.com>
Collaborative Fusion, Inc.
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