ar7100> loadb
## Ready for binary (kermit) download to 0x81F00000 at 115200 bps...
## Total Size = 0x00340000 = 3407872 Bytes
## Start Addr = 0x81F00000
ar7100> iminfo

## Checking Image at 81f00000 ...
Image Name: MIPS OpenWrt Linux-2.6.32.25
Created: 2010-11-20 4:31:08 UTC
Image Type: MIPS Linux Kernel Image (lzma compressed)
Data Size: 888608 Bytes = 867.8 kB
Load Address: 80060000
Entry Point: 80060000
Verifying Checksum ... OK
ar7100> erase BE060000 BFFDFFFF
Erase Flash from 0xbe060000 to 0xbffdffff in Bank # 1 First 0x3 last 0xfe
100%
Erased 252 sectors
ar7100> cp.b 81f00000 be060000 340000
Copy to Flash...
Copy 3407872 byte to Flash...
100%
done

tftpbootでもkermitでも転送後にiminfoを実行してverifuing checksumがokの場合は多分いいんじゃないかと思います。