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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 Maca and press ESC when prompted to enter bootloader then press <Ctrl+C> 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 Lima's RAM.

tftp 80060000 caraboot-maca-v2.8.bin

7. Write u-boot binary from RAM to FLASH memory. Warning: do not proceed with this step if step 5 failed !!!

sf erase 0x0 +${filesize}; sf write 0x80060000 0x0 ${filesize}

8. Set environment to correct defaults:

sf erase 0x40000 +0x40000

9. Reset board:

reset

10. Press ESC when prompted to enter bootloader then press <Ctrl+C> a few times to clear console buffer.

Issue save environment command:

saveenv

11. Reset board:

reset