Date: Wed, 21 Dec 2016 23:26:35 -0800 (PST) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: Mark Johnston <markj@freebsd.org> Cc: Alan Somers <asomers@freebsd.org>, "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: Setting a dump device from db> ? Message-ID: <201612220726.uBM7QZtJ071053@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <20161219213308.GA55919@wkstn-mjohnston.west.isilon.com>
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> On Mon, Dec 19, 2016 at 02:16:25PM -0700, Alan Somers wrote:
> > Is it possible to set a dump device from loader.conf or from the db>
> > prompt? I'm trying to investigate a panic in mpr(4), but I can only
> > reproduce it during the boot, before rc(8) has set my dump device. It
> > looks like ada(4) initializes before mpr(4), so I should be able to
> > dump to an ada device, if only I can figure out how. If not, I
> > suppose I'll have to try gdb over firewire.
>
> You can set "dumpdev=ada0p1" or so in loader.conf. See g_dev_init() and
> init_dumpdev(). This should probably be documented in loader.conf(5).
Please review and if OK commit
Index: sys/boot/forth/loader.conf
===================================================================
--- sys/boot/forth/loader.conf (revision 310132)
+++ sys/boot/forth/loader.conf (working copy)
@@ -101,6 +101,7 @@
#prompt="\\${interpret}" # Set the command prompt
#root_disk_unit="0" # Force the root disk unit number
#rootdev="disk1s1a" # Set the root filesystem
+#dumpdev="disk1s1b" # Set a dump device early on for crashes during boot
#tftp.blksize="1428" # Set the RFC 2348 TFTP block size.
# If the TFTP server does not support RFC 2348,
# the block size is set to 512. If the value
--
Rod Grimes rgrimes@freebsd.org
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