U-Boot# setenv bootargs console=ttyO0,115200n8 quiet root=/dev/ram
U-Boot# bootm 0x80200000 0x80700000 0x80900000
## Booting kernel from Legacy Image at 80200000 ...
   Image Name:   Angstrom/3.8.13/beaglebone
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    4234376 Bytes = 4 MiB
   Load Address: 80008000
   Entry Point:  80008000
   Verifying Checksum ... OK
## Loading init Ramdisk from Legacy Image at 80700000 ...
   Image Name:   vvu
   Image Type:   ARM Linux RAMDisk Image (gzip compressed)
   Data Size:    1905664 Bytes = 1.8 MiB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
## Flattened Device Tree blob at 80900000
   Booting using the fdt blob at 0x80900000
   Loading Kernel Image ... OK
OK
   Loading Ramdisk to 9f061000, end 9f232400 ... OK
   Using Device Tree in place at 80900000, end 809087db

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.