On Debian, you only have to hold the boot button down for the first
boot. Files get moved around so that the boot button is not required.
Then, run the script "/opt/scripts/tools/grow_partition.sh" to make the
whole uSD card available.
Chad
On 2/19/2015 1:59 AM, Daniel Simmons wrote:
I'm working on an application where I need access to a great many GPIO
pins, so it's my plan to disable both the HDMI and eMMC virtual capes
to free up those pins. This means, of course, that I'll need to boot
from the micro SD card.
So actually my first question is: While I know that I can boot from
the micro SD card by holding down the button on the board while
applying power, how do I go about configuring the board so that it
will boot from the micro SD card without holding down the button?
What happens if I edit uenv.txt on the eMMC to disable the eMCC and
then try to boot without holding down the button? That seems like it
could be bad.
Next, I'm wondering if it's possible to enable and disable the eMCC at
runtime. What I'd like to do is boot from the micro SD card and most
of the time use all of the GPIO pins because the eMCC is disabled, but
at startup and shutdown I'd like to enable the eMCC and use it as a
persistent storage for a few configuration values that need to survive
having the micro SD card replaced for a software upgrade. So at
startup I would enable the eMCC long enough to mount it and read a
file, then unmount it at disable the eMCC. Then at shutdown I would
enable it again and mount it long enough to write new values to that file.
Am I crazy to think about this? Or is there some way I can use
capemgr or the like to accomplish it? Worst case scenario maybe I
could write a system which would edit uenv.txt and a startup script
and then trigger a reboot in order to enable/disable, but that seems
potentially slow and fragile...
Thanks,
Danny
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Chad Baker, Memphis, TN 38104
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