Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1451022
| From | Masahiro Yamada <yamada.masahiro@socionext.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: debug tip after earlycon is closed? |
| Date | 2016-07-27 05:30 +0200 |
| Message-ID | <rZnHH-2rc-9@gated-at.bofh.it> (permalink) |
| References | <rZlPA-1a1-1@gated-at.bofh.it> <rZmBX-1Ls-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hi Sebastian, 2016-07-27 11:17 GMT+09:00 Sebastian Reichel <sre@kernel.org>: > Hi, > > On Wed, Jul 27, 2016 at 10:23:09AM +0900, Masahiro Yamada wrote: >> When the kernel fails to boot and its log console is silent, >> I use earlycon and I often find the cause of error with it. >> >> But, I have been wondering if there is an easy-to-use >> debug tip which is available after earlycon is disabled. >> >> I noticed the current mainline would not boot on my ARMv8 board. >> According to the following log, I am guessing something wrong >> is happening after the "bootconsole [uniphier0] disabled" log. >> >> Is there a good practice to see more log? > > Documentation/kernel-parameters.txt > keep_bootcon [KNL] > Do not unregister boot console at start. This is only > useful for debugging when something happens in the window > between unregistering the boot console and initializing > the real console. I did not know this kernel parameter, and it is exactly what I wanted. Thanks a lot! -- Best Regards Masahiro Yamada
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
debug tip after earlycon is closed? Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-07-27 03:30 +0200
Re: debug tip after earlycon is closed? Sebastian Reichel <sre@kernel.org> - 2016-07-27 04:20 +0200
Re: debug tip after earlycon is closed? Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-07-27 05:30 +0200
Re: debug tip after earlycon is closed? Arnd Bergmann <arnd@arndb.de> - 2016-07-27 09:40 +0200
Re: debug tip after earlycon is closed? Masahiro Yamada <yamada.masahiro@socionext.com> - 2016-07-28 04:10 +0200
Re: debug tip after earlycon is closed? Arnd Bergmann <arnd@arndb.de> - 2016-07-28 09:50 +0200
Re: debug tip after earlycon is closed? Russell King - ARM Linux <linux@armlinux.org.uk> - 2016-07-28 14:30 +0200
Re: debug tip after earlycon is closed? Rabin Vincent <rabin@rab.in> - 2016-08-08 11:10 +0200
csiph-web