u-boot 2017.03 on BeagleBone Black

resetting ...

U-Boot SPL 2017.03 (Apr 18 2017 - 23:36:24)
Trying to boot from MMC1
MMC partition switch failed
*** Warning - MMC partition switch failed, using default environment

reading u-boot.img
reading u-boot.img


U-Boot 2017.03 (Apr 18 2017 - 23:36:24 +0100)

CPU  : AM335X-GP rev 2.0
Model: TI AM335x BeagleBone Black
DRAM:  512 MiB
MMC:   OMAP SD/MMC: 0, OMAP SD/MMC: 1
** First descriptor is NOT a primary desc on 1:1 **
*** Warning - bad CRC, using default environment

<ethaddr> not set. Validating first E-fuse MAC
Net:   eth0: ethernet@4a100000
Press SPACE to abort autoboot in 2 seconds
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
reading boot.scr
** Unable to read file boot.scr **
reading uEnv.txt
654 bytes read in 8 ms (79.1 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc0 ...
Running uenvcmd ...
switch to partitions #0, OK
mmc0 is current device
reading zImage
** Unable to read file zImage **
Wrong Image Format for bootm command
ERROR: can't get kernel image!
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
reading /am335x-boneblack.dtb
31186 bytes read in 14 ms (2.1 MiB/s)
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
Failed to mount ext2 filesystem...
** Unrecognized filesystem type **
** 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 **
** 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 **
SD/MMC found on device 1
** No partition table - mmc 1 **
## Error: "bootcmd_nand0" not defined
starting USB...
USB0:   Port not available.
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
BOOTP broadcast 1