Entering kdb in early boot

[Thomas Skibo]

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 

——
Thomas Skibo
ThomasSkibo at yahoo.com