svn commit: r297190 - head/sys/kern

[Jean-Sébastien Pédron]

On 22/03/2016 16:55, Ian Lepore wrote:
> On Tue, 2016-03-22 at 13:46 +0000, Edward Tomasz Napierala wrote:
>> Author: trasz
>> Date: Tue Mar 22 13:46:01 2016
>> New Revision: 297190
>> URL: https://svnweb.freebsd.org/changeset/base/297190
>>
>> Log:
>>   Wait for root mount tokens before showing the root mount prompt.
>>   This restores the pre-r290196 behaviour, eliminating the need to manually
>>   press '.' a couple of times to get USB to finish probing.
>>   
>>   Note that there's still something wrong with the console (character
>>   echoing doesn't quite work), and there's also a reported problem with
>>   BHyVe, but those two don't seem related to the problem above.
> 
> Just a datapoint on the echoing... it works fine on a serial console,
> it's been years since I've seen glitches at the mountroot prompt.  So
> the problem may be in vt or kbdmux.

I confirm this is a known issue with vt(4): it uses a callout to refresh
the screen, but for reasons unknown to me, the callout is not called
anymore on mountroot prompt. I tried to debug this but failed. Since
then, I didn't have time to work on this again.

So maybe callouts are disabled in this situation. If there is a way to
detect that, then vt(4) can go back to a "synchronous mode" where it
refreshes the screen after each typed character, like it does when ddb
is active.

I will repeat this in the bug report.

-- 
Jean-Sébastien Pédron

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