Hi Sebastian,


2016-07-27 11:17 GMT+09:00 Sebastian Reichel [off-list ref]:

Hi,

On Wed, Jul 27, 2016 at 10:23:09AM +0900, Masahiro Yamada wrote:

quoted

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