Dragino PAB2, User Manual

Page: 27 / 39

Press the Failsafe button and power up Yun Shield; user will see all the LEDs blink together,
release the button after 10 seconds and there are some messages will pop up in the Hercules
panel, which means the Yun Shield has been in Failsafe Netconsole mode and ready to access
commands.
User can type the commands in Hercules to transfer and upgrade Yun Shield to the latest
firmware with factory settings.
The update commands are as below, replace the xxx with the actually version.
Note when typing command in Hercules : user must add <CR> at the end of each command; $ is
a special char in Hercules, user should double it (key two $$) when typing.
Upgrade Kernel
tftpboot 0x81000000 ms14 - arduino - yun - kernel - xxx . bin
erase 0x9fea0000 + 0x140000
cp. b 0x81000000 0x9fea0000 $filesize
Upgrade rootfs
tftpboot 0x81000000 ms14 - arduino - yun -- rootfs - squashfs - xxx . bin
erase 0x9f050000 + 0xe50000
cp. b 0x81000000 0x9f050000 $filesize
Reset to the new firmware
reset
Warning : User should use exactly address number in the erase and cp.b shows, wrong address
number may properly destroy the boot-loader of Yun Shield and the device won’t boot anymore.
Or destroy the radio data of Yun Shield which may lead to a poor wifi performance or incorrect
MAC addresses.
Recover in Linux is similar with Windows,
the mail different is that the tool use in Linux is
nc
and runs with
nc -kul 6666.
Below shows that the Yun Shield has been in Failsafe Netconsole
mode and detected by nc.
w w w . e k t
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