Ctrl-Alt-ESC during boot
chuck_tuffli at agilent.com
Wed Jan 26 14:58:38 PST 2005
On Wed, Jan 26, 2005 at 01:57:20PM -0800, Matthew Dillon wrote:
> :On Wed, 26 Jan 2005, Chuck Tuffli wrote:
> :> boot -d does drop the OS into ddb, but after continuing, ctrl-alt-esc
> :> doesn't break into ddb.
> :I discovered (the hard way) that there is a kernel config option
> :SC_DISABLE_DDBKEY which has that effect. Is there any chance that
> :the kernel on the CD was compiled with that option? I suppose only(?)
> :Matt would know. The option is not in the GENERIC kernel but is
> :in LINT.
> I'm a bit confused. SC_DISABLE_DDBKEY disables your ability to
> enter the debugger through ctl-alt-esc. Why would you want to have
> that option on by default?
I don't have this set ...
> ctl-alt-esc does eventually work if I boot -d and then 'cont', but
> you have to realize that the system disables interrupts during early boot
> so it won't see a ctl-alt-esc that early in the boot sequence.
This might explain what is going on. The hang occurs in
autoconf.c/configure() inside the call to spl0().
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