いじってたらu-boot プロンプトに来れた。

• タクトスイッチを押しながら電源ON
  
• スイッチを押し続けている間は、Please choose ... 1:〜 2:〜 3:〜 の所で止まるので、押し続けたまま、コンソールから 「3」を押す
  
• タクトスイッチを離す
  
• u-bootのプロンプトに入れた
  

遊べそう。ヮーィ

U-Boot 1.1.3 (Jan  6 2010 - 07:10:30)

Board: Fonera
DRAM:  32 MB
relocate_code Pointer at: 81fac000
spi_wait_nsec: 3e 
spi deice id: c2 20 15 c2 20 (2015c220)
find flash: mx25l1605d
raspi_read: from:41030000 len:1000 
Using default environment


 ##### The CPU freq = 320 MHZ #### 

SDRAM bus set to 16 bit 
 SDRAM size =32 Mbytes

Please choose the operation: 
   1: Boot system code via Flash (default).
   2: Load system code then write to Flash via TFTP. 
   3: Entr boot command line interface.
reset pressed for 2 seconds

You selected 3
                                                                                                                                                                                                                                             0 


   
3: System Enter Boot Command Line Interface.

U-Boot 1.1.3 (Jan  6 2010 - 07:10:30)
RT3052 # 
RT3052 # 
RT3052 # ?
erase   - erase SPI FLASH memory
?       - alias for 'help'
bootm   - boot application image from memory
cp      - memory copy
go      - start application at address 'addr'
help    - print online help
httpd   - start webserver
md      - memory display
mm      - memory modify (auto-incrementing)
mw      - memory write (fill)
nm      - memory modify (constant address)
printenv- print environment variables
reset   - Perform RESET of the CPU
setenv  - set environment variables
tftpboot- boot image via network using TFTP protocol
version - print monitor version
RT3052 # help set
setenv name value ...
    - set environment variable 'name' to 'value ...'
setenv name
    - delete environment variable 'name'

RT3052 # printenv
bootcmd=httpd
bootdelay=2
baudrate=57600
ethaddr="00:AA:BB:CC:DD:10"
ipaddr=10.10.10.200
serverip=10.10.10.3
ramargs=setenv bootargs root=/dev/ram rw
addip=setenv bootargs $(bootargs) ip=$(ipaddr):$(serverip):$(gatewayip):$(netmask):$(hostname):$(netdev):off
addmisc=setenv bootargs $(bootargs) console=ttyS0,$(baudrate) ethaddr=$(ethaddr) panic=1
flash_self=run ramargs addip addmisc;bootm $(kernel_addr) $(ramdisk_addr)
kernel_addr=BFC20000
bootfile=fonita.img
u-boot=u-boot.bin
load=tftp 8A100000 $(u-boot)
u_b=protect off 1:0-1;era 1:0-1;cp.b 8A100000 BC400000 $(filesize)
loadfs=tftp 8A100000 root.cramfs
u_fs=era bc540000 bc83ffff;cp.b 8A100000 BC540000 $(filesize)
test_tftp=tftp 8A100000 root.cramfs;run test_tftp
stdin=serial
stdout=serial
stderr=serial
ethact=Eth0 (10/100-M)

Environment size: 786/4092 bytes
RT3052 # version

U-Boot 1.1.3 (Jan  6 2010 - 07:10:30)