Well yes, I can mount and edit. It didn't occur to me that a card inserted 
after boot would be detected. Thanks for that advice. Following up with 
more on the topic:

1) Is there a reason that the SD card isn't in /etc/fstab to make mounting 
simple for beginners - or auto-mounted? In other words, is that a bad idea 
to be avoided? Perhaps an issue with trying to share a single image for 
SDcard and eMMC boooting?
2) On the image I downloaded and put on the SD card there is both 
/boot/uEnv.txt and /uEnv.txt. What is the reason/purpose for the /uEnv.txt? 
I'm pretty sure I didn't create/copy it - it's totally different than 
/boot/uEnv.txt - from comments it looks like it aims to support older 
Angstrom/2014 Debian systems?
3) If I understand correctly there is another FAT volume on the eMMC as 
shipped, that is seen as a remote (FAT?) volume when the BBB is connected 
as a USB client. Is there any way to mount that for access from the bone 
directly?

Thanks for the earlier response.

On Monday, February 13, 2017 at 11:05:33 AM UTC-8, RobertCNelson wrote:
>
> On Mon, Feb 13, 2017 at 1:02 PM, ags <[email protected] <javascript:>> 
> wrote: 
> > I downloaded a new image onto an SD card and booted my BBB. I then 
> edited 
> > the /boot/uEnv.txt file to remove the comment from the last line to 
> enable 
> > flashing to the eMMC upon reboot. It worked as expected. 
> > 
> > Now I have an SD card with an image that I could use again as a backup 
> boot 
> > device - but I need to re-comment the flasher line. If I boot from the 
> SD 
> > card it will flash again (correct?). How can I get access to the 
> > /boot/uEnv.txt file on the SD card? Can I mount it somehow after booting 
> > from the eMMC? I tried to mount the SD card on a Mac to edit the file, 
> but 
> > only the FAT partition was accessible. 
>
>
> Just plug it in after it boots off the eMMC.. 
>
> Regards, 
>
> -- 
> Robert Nelson 
> https://rcn-ee.com/ 
>

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