===== Flash Bootloader =====
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ATTENTION! Bootloader upgrade is a risky operation and should not be performed unless absolutely necessary! If anything goes wrong
during this process (power shortage, mistype, etc.) the board will be BRICKED (broken). Keep in mind that warranty does not cover
Carambola 2 module if it is damaged due to user's fault.
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1. Install ''tftp'' server.
2. Copy ''u-boot'' binary to the ''tftp'' directory.
3. Set ''192.168.1.254'' IP address on your tftp server's ethernet interface.
4. Reboot Carambola and press ESC when prompted to enter bootloader then press a few times to clear console buffer.
5. Set local and server IP addresses:
setenv ipaddr 192.168.1.1
setenv serverip 192.168.1.254
6. Download u-boot binary into Carambola's RAM.
tftpboot 0x80060000 caraboot-carambola2-v2.3.bin
4. Write u-boot binary from RAM to FLASH memory. **Warning: do not proceed with this step if step 5 failed !!!**
erase 0x9f000000 +${filesize}; cp.b 0x80060000 0x9f000000 ${filesize}
5. Reset board:
reset