Upgrading firmware using only UART

WARNING !
You can brick your Carambola. There is no way out. Ensure power is rock solid and don't breath while not finished :)

See here for recommended serial port programs and settings for Carambola.

Please choose the operation:  
  1: Load system code to SDRAM via TFTP.  
  2: Load system code t hen write to Flash via TFTP. 
  3: Boot system code via Flash (default). 
  4: Entr boot command line interface. 
  7: Load Boot Loader code then write to Flash via Serial.  
  9: Load Boot Loader code then write to Flash via TFTP. 
erase 0xbf050000 0xbf7fffff
loadb
cp.b 0x80100000 0xbf050000 0x600000