My pre-1.0 wishlist

Gary E. Miller gem at
Sun Jun 5 20:57:42 UTC 2016

Yo Eric!

On Sun, 5 Jun 2016 09:50:15 -0400
"Eric S. Raymond" <esr at> wrote:

> Gary E. Miller <gem at>:
> > On Sun, 5 Jun 2016 01:02:08 -0400  
> > > > Use the console serial port.  Then you can see bootup even
> > > > before video init.    
> > > 
> > > Er, how? I don't see RS232 on that thing and don't know how the
> > > USB ports map to serial devices.  
> > 
> > There is a little white 4 pin male connector.  On the short end
> > opposite the ethernet connector.  If you have serial to USB
> > converter laying around you can plug it in there.  Otherwise you
> > need to buy their adaptor for $13:
> > 
> >
> > 
> > A much eassier way to get console than HDMI, etc.  
> Only as a last resort.  This strikes me as a "now you have *two*
> probems" kind of answer.

On the serial port I just need to get the speed right (hint: 115200).
Then I can use minicom to put the console on my desktop.

On the HDMI I need a dedicated screen, or switch back and forth from my
desk top to the Pi on the same monitor.  Also, if my edid is not 100%
correct I need to get right the aspect ration, refresh rate, height, width,
overscan, pixel encoding, etc.

Now add in that HDMI only works AFTER uboot is done.  So you can not
debug or twiddle with the boot process until it is too late to
set any kernel params.

With the serial port I can go to the uboot command line, then set variables,
etc.  With HDMI, it is try, wait awhile until nothing happens, pull
the SD card,  mount SD card on laptop, tweak a setting, replace SD card
in Odroid, repeat.  Way too much work.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at  Tel:+1 541 382 8588
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