I want to change boot order of laptop.
There is no BIOS in FOSSEE Laptop.
However, if you are using a dual boot device, you may look into u-boot source code and modify it to obtain alternate boot order. You may also need support from vendor to re-flash u-boot to NAND. We haven't changed the u-boot at FOSSEE.
Optionally, you may also boot from 8GB sdcard, without worrying about NAND installation. In an GNU/Linux operating system, perform the following:
4) Insert the sdcard to FOSSEE-Laptop, and restart. FOSSEE-OS shall now boot from external SDCARD.