On Feb 10, 2015 5:03 AM, "Robert P. J. Day" <[email protected]> wrote: > > > putting together a student lab for building u-boot for the BBB > (which i'll post shortly for anyone who's interested), and just > noticed that when i boot from a minimally-populated SD card (that is, > nothing but MLO and u-boot.ing and an empty uEnv.txt), u-boot still > insists on checking out possible partitions in eMMC, which i *don't* > want it to do. > > here's snippets of the output on the console. first, i can see where > it consults the uEnv.txt file in the VFAT partition, which is > deliberately empty: > > ... snip ... > mmc0 is current device > gpio: pin 54 (gpio 54) value is 1 > Checking for: /uEnv.txt ... > reading uEnv.txt <-- good > 0 bytes read in 3 ms (0 Bytes/s) > ... snip ... > > but further down, u-boot runs off to eMMC and pulls in uEnv.txt files > there as well: > > ... snip ... > switch to partitions #0, OK > mmc1(part 0) is current device > gpio: pin 54 (gpio 54) value is 1 > Checking for: /uEnv.txt ... > reading uEnv.txt > 26 bytes read in 3 ms (7.8 KiB/s) <-- there ... > gpio: pin 55 (gpio 55) value is 1 > Loaded environment from uEnv.txt > Importing environment from mmc ... > Checking if uenvcmd is set ...
Your answer is here: ^ Define uenvcmd to anything and it'll stop dead. > Checking if client_ip is set ... > Checking for: /boot.scr ... > Checking for: /boot/boot.scr ... > Checking for: /boot/uEnv.txt ... > gpio: pin 55 (gpio 55) value is 1 > 33 bytes read in 42 ms (0 Bytes/s) <-- ... and there > Loaded environment from /boot/uEnv.txt > ... snip ... > > for the purposes of simplicity, i would prefer that u-boot consult > nothing beyond the SD card ... without reconfiguring and rebuilding > u-boot, what is the easiest way to do that? thanks. Your best option is just to really rebuild mainline without my patch. Regards, -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
