Entering kdb in early boot

[Ian Lepore]

On Sat, 2018-02-17 at 15:50 -0800, Thomas Skibo via freebsd-arm wrote:
> Hello:
> 
> I noticed that ARM machdep.c doesn’t support entering kdb on boot
> (boot -d from the loader).  I looked to see how other architectures
> implement it and came up with an easy patch.
> 
> While trying to get this to work, I discovered that machdep_boot.c
> doesn’t include opt_ddb.h and so the kernel symbols weren’t getting
> loaded into the debugger early in the boot (see the call to
> db_fetch_ksymtab() in freebsd_parse_boot_param()).  I have never
> noticed any problems with symbols in kdb before.  I wonder how those
> symbols eventually get loaded and wonder if now I'm calling it twice.
> 
> In any case, I’d be happy to put this up on phabricator if you like.
> 
> —Thomas 
> 

Please do.

-- Ian