Robert,
My BBB absolutely must default to booting from the uSD. I know I
could short the boot switch, or move pull-up/down resistors, or create a
hardware switch gated from reset, but I don't want to lose hardware
compatibility with other BBB boards, or give up the option of manually
booting from eMMC occasionally. The code you suggest here sounds perfect -
but I'm not positive what to do with it. From the formatting of the text, I
suspect it is intended to be compiled into a new u-boot.img and MLO image,
but I'm not sure how to do that.
Before I spend hours learning how, is there a chance I could just insert
the basic ideas into my uEnv.txt as "mmcboot=mmc dev 0; if mmc rescan ;
then ..."? It does look like uEnv.txt is read before the mmcboot command
runs...
If so, does it have to be run together into a single ';' separated line, or
can I leave the '\' line continuations in to make it more readable?
I suspect uEnv.txt would not want the double-quotes? Or Windows <CRLF> line
endings...
If that is totally hopeless, can you suggest a tutorial on building a new
u-boot.img and MLO with this code?
Thank you for any clues,
Loren
On Thursday, January 2, 2014 2:16:47 PM UTC-8, RobertCNelson wrote:
>
> I have mine setup as the following..
>
> + "mmc dev 0; if mmc rescan ; then " \
> + "gpio set 54; " \
> + "setenv mmcdev 0; " \
> + "echo SD/MMC found on device ${mmcdev}; " \
> + "if run loadbootenv; then " \
> + "run importbootenv; " \
> + "fi; " \
> + "gpio set 55; " \
> + "echo Checking if uenvcmd is set ...;" \
> + "if test -n $uenvcmd; then " \
> + "gpio set 56; " \
> + "echo Running uenvcmd ...; " \
> + "run uenvcmd;" \
> + "fi; " \
> + "echo; echo uenvcmd was not defined in uEnv.txt ...;
> echo trying eMMC (BeagleBone Black) ...; echo;" \
> + "fi;" \
> + "mmc dev 1; if mmc rescan ; then " \
> + "gpio set 54; " \
> + "setenv mmcdev 1; " \
> + "echo SD/MMC found on device ${mmcdev}; " \
> + "if run loadbootenv; then " \
> + "run importbootenv; " \
> + "fi; " \
> + "gpio set 55; " \
> + "echo Checking if uenvcmd is set ...;" \
> + "if test -n $uenvcmd; then " \
> + "gpio set 56; " \
> + "echo Running uenvcmd ...; " \
> + "run uenvcmd;" \
> + "fi; " \
> + "echo; echo uenvcmd was not defined in uEnv.txt ...;
> echo halting ...; echo;" \
> + "fi;" \
>
>
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