через нуль-модемный кабель по RS-232 при загрузке получил лог
OK

U-Boot 2010.03 (сен 07 2017 - 15:34:43) (OWEN-20170907-5482)


CPU: S3C2416@400MHz Fclk = 800MHz, Hclk = 133MHz, Pclk = 66MHz
Board: SPK105 DDR2
DRAM: 64 MB
NAND: 128 MiB

NAND read: device 0 offset 0xe0000, size 0x20000
131072 bytes read: OK
In: serial
Out: serial
Err: serial
Hit any key to stop autoboot: 0

NAND read: device 0 offset 0x120000, size 0x1c0000
1835008 bytes read: OK
## Booting kernel from Legacy Image at 30000000 ...
Image Name: Linux-3.0.18-rt34
Created: 2017-09-07 12:36:28 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 1787752 Bytes = 1.7 MB
Load Address: 30008000
Entry Point: 30008000
Verifying Checksum ... OK
Loading Kernel Image ... OK
OK

Starting kernel ...

Uncompressing Linux... done, booting the kernel.