So on my A5A...
U-Boot SPL 2016.09-rc2-00001-g2e7c9a7 (Sep 09 2016 - 14:20:16)
Trying to boot from MMC2
Expected Linux image is not found. Trying to start U-boot
U-Boot 2016.09-rc2-00001-g2e7c9a7 (Sep 09 2016 - 14:20:16 -0500),
Build: jenkins-github_Bootloader-Builder-446
DRAM: 512 MiB
Reset Source: Power-on reset has occurred.
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
Using default environment
Board: BeagleBone Black
Net:
Warning: ethernet@4a100000 using MAC address from ROM
eth0: ethernet@4a100000
Press SPACE to abort autoboot in 2 seconds
board_name=[A335BNLT] ...
board_rev=[0A5A] ...
Card did not respond to voltage select!
Card did not respond to voltage select!
Card did not respond to voltage select!
gpio: pin 56 (gpio 56) value is 0
gpio: pin 55 (gpio 55) value is 0
gpio: pin 54 (gpio 54) value is 0
gpio: pin 53 (gpio 53) value is 1
Card did not respond to voltage select!
Card did not respond to voltage select!
** First descriptor is NOT a primary desc on 1:1 **
switch to partitions #0, OK
mmc1(part 0) is current device
** No partition table - mmc 1 **
gpio: pin 56 (gpio 56) value is 0
gpio: pin 55 (gpio 55) value is 0
gpio: pin 54 (gpio 54) value is 0
gpio: pin 53 (gpio 53) value is 1
** First descriptor is NOT a primary desc on 1:1 **
switch to partitions #0, OK
mmc1(part 0) is current device
** First descriptor is NOT a primary desc on 1:1 **
gpio: pin 54 (gpio 54) value is 1
** No partition table - mmc 1 **
Checking for: /uEnv.txt ...
** No partition table - mmc 1 **
Checking for: /boot.scr ...
** No partition table - mmc 1 **
Checking for: /boot/boot.scr ...
** No partition table - mmc 1 **
Checking for: /boot/uEnv.txt ...
** No partition table - mmc 1 **
** No partition table - mmc 1 **
** No partition table - mmc 1 **
** No partition table - mmc 1 **
** No partition table - mmc 1 **
** No partition table - mmc 1 **
** No partition table - mmc 1 **
starting USB...
USB0: Port not available.
ethernet@4a100000 Waiting for PHY auto negotiation to complete
Crap!