U-Boot# 
U-Boot# loady 0x88000000
## Ready for binary (ymodem) download to 0x88000000 at 115200 bps...
CCCC
Starting ymodem transfer.  Press Ctrl+C to cancel.
Transferring am335x-boneblack.dtb...
  100%      24 KB       3 KB/sec    00:00:08       1 Errors  

## Total Size      = 0x00006134 = 24884 Bytes
U-Boot# loady 0x82000000
## Ready for binary (ymodem) download to 0x82000000 at 115200 bps...
CC
Starting ymodem transfer.  Press Ctrl+C to cancel.
Transferring uImage...
  100%    4267 KB       9 KB/sec    00:07:12       1 Errors  

## Total Size      = 0x0042adf8 = 4369912 Bytes
U-Boot# bootm 0x80008000
Wrong Image Format for bootm command
ERROR: can't get kernel image!
U-Boot# bootm
Wrong Image Format for bootm command
ERROR: can't get kernel image!
U-Boot# bootm 0x82000000
## Booting kernel from Legacy Image at 82000000 ...
   Image Name:   Linux-3.8.13
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    4369848 Bytes = 4.2 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.

Error: unrecognized/unsupported machine ID (r1 = 0x00000e05).

Available machine support:

ID (hex)        NAME
ffffffff        Generic OMAP4 (Flattened Device Tree)
ffffffff        Generic AM33XX (Flattened Device Tree)
ffffffff        Generic OMAP3-GP (Flattened Device Tree)
ffffffff        Generic OMAP3 (Flattened Device Tree)
0000060a        OMAP3 Beagle Board
00000a9d        IGEP OMAP3 module
00000928        IGEP v2 board
00000ae7        OMAP4 Panda board

Please check your kernel config and/or bootloader.