Re: [Gumstix-users] Garbage console using Robostix FFUART

[rlboyd <rl...@gm...>]

Not sure if this is dead or not but I am seeing the same garbage. Trying to
apply the patch now to see if it also fixes my problem.


Dave Hylands wrote:
> 
> HI Dave,
> 
>> Turns out if you use an rs232 converter attached to the robostix, and a
>> later version of the buildroot, you get garbage on the console for a few
>> minutes, before it clears up. The solution is attached... Any one want to
>> hazard a guess as to what's going on? And have I done anything terrible
>> removing CONSOLE_VT ?
> 
> Hmmm. It's probably been changed related to the LCD stuff, but I don't
> understand why this would only affect the robostix.
> 
> Are you using a verdex or connex? And can you give me a version of
> buildroot where you definitely saw the problem?
> 
> One possibility relates to the way the system starts up with the
> verdex. There is a few seconds after power is applied before the
> SYS_EN signal is asserted. On the newer boards, like the console-vx,
> the SYS_EN signal ties into the voltage regulator enable.
> 
> The robostix doesn't have this circuitry, so it would be powering up
> the voltage converters right away, and they might be seeing garbage,
> which then gets transmitted to the serial adapter.
> 
> Some types of garbage can cause the terminal emulator to change fonts.
> The one I see most often has got lots of lines and stuff. Normally, if
> I reset the terminal, then things are fine.
> 
> At work I see this type of behaviour because we use power management
> and we haven't synchronized the power management with there being data
> in the uart fifos, so we often see this transition when entering low
> power modes.
> 
> -- 
> Dave Hylands
> Vancouver, BC, Canada
> http://www.DaveHylands.com/
> 
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems?  Stop.
> Now Search log events and configuration files using AJAX and a browser.
> Download your FREE copy of Splunk now >> http://get.splunk.com/
> _______________________________________________
> gumstix-users mailing list
> gum...@li...
> https://lists.sourceforge.net/lists/listinfo/gumstix-users
> 
> 

-- 
View this message in context: http://www.nabble.com/Garbage-console-using-Robostix-FFUART-tp13056350p15056503.html
Sent from the Gumstix mailing list archive at Nabble.com.