Yeah, you're modifying the wrong file.
debian@beaglebone:~/nfs$ cat /boot/uEnv.txt
#Docs: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0
uname_r=4.4.12-ti-r31
#uuid=
#dtb=
##BeagleBone Black/Green dtb's for v4.1.x (BeagleBone White just works..)
*##BeagleBone Black: HDMI (Audio/Video)
disabled:dtb=am335x-boneblack-emmc-overlay.dtb*
. . .
*dtb=am335x-boneblack-emmc-overlay.dtb *is the line you're after, and it
probably is proceeded by a pound( # ) symbol. So it's commented out. SImply
remove the # to uncomment, and then reboot the board.
On Mon, Jun 27, 2016 at 1:20 PM, richatnstar via BeagleBoard <
beagleboard@googlegroups.com> wrote:
> Hi,
>
> My BBB stack has a 4.3" LCD cape -- powerup diagnostics (dmesg) indicated
> the cape was found OK & brightness worked Ok. I was unable to view
> (startup) text on the display. (Ver 4.4.1-bone11). After a few days of
> debug, I found that the MuxPins were not properly updated and were still
> accessing HDMI (not modified as expected). I added an 'echo' into /uEnv.txt
> & discovered that the 'overlay file' was not right - it was the default
> chosen at power-up.
>
> /boot/uEnv.txt has the lines (amongst others)
>
> dtb=am335x-boneblack-overlay.dtb
> Disable: HDMI
>
> /uEnv.txt was modified - *fdtfile* was replaced by *dtb*
>
> #loadxfdt=load mmc 0:1 ${fdtaddr} /boot/dtbs/${uname_r}/${fdtfile}
> loadxfdt=load mmc 0:1 ${fdtaddr} /boot/dtbs/${uname_r}/*${dtb}*
>
> Possibly modifying fdtfile is the appropriate method -- Is there a better
> solution?
>
> thx
>
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