Date: Sat, 22 Apr 2017 12:21:00 -0700 From: Mark Millard <markmi@dsl-only.net> To: zaphod@berentweb.com, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Several minor questions (12.0-amd64) Message-ID: <D950AE01-4574-43E6-838F-2641ED3C1135@dsl-only.net>
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Beeblebrox zaphod at berentweb.com wrote on Sat Apr 22 06:04:01 UTC 2017 : > 3. Under one scenario, I'm getting a kernel panic but I cannot dump because > busybox states "no dumpdev specified" which means rc.conf (where I have > dumpdev set) has not been read yet. How can I pass dumpdev wile in busybox > command line so that ">dump" does its job? /boot/loader.conf allows for an earlier time frame for having dumpdev. For example I have: # more /boot/loader.conf geom_label_load="YES" # File system labels (see glabel(8)) kern.cam.boot_delay="10000" dumpdev="/dev/label/BPIM3swap" Supporting documentation is from: https://www.freebsd.org/cgi/man.cgi?query=loader&sektion=8&apropos=0&manpath=FreeBSD+11.0-RELEASE+and+Ports and includes the following about dumpdev: LOADER(8) FreeBSD System Manager's Manual LOADER(8) NAME loader -- kernel bootstrapping final stage . . . BUILTIN ENVIRONMENT VARIABLES The loader has actually two different kinds of `environment' variables. There are ANS Forth's environmental queries, and a separate space of environment variables used by builtins, which are not directly available to Forth words. It is the latter type that this section covers. . . . dumpdev Sets the device for kernel dumps. This can be used to ensure that a device is configured before the corresponding dumpdev directive from rc.conf(5) has been processed, allowing kernel panics that happen during the early stages of boot to be cap- tured. === Mark Millard markmi at dsl-only.nethelp
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