I can address only the part about the Windows line endings. U-boot only
works with Unix line endings.
I had edited my uEnv.txt file on my Windows box and couldn't understand why
it was complaining
about a variable; eventually I guessed that it was because of the carriage
return. As soon as I opened
the file with vi on linux I could see them. The u-boot documentation does
caution the reader about
its fussiness.
On Monday, February 17, 2014 10:17:22 PM UTC-8, Loren Amelang wrote:
>
> 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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