The bootloader is a small program to load kernel and pass kernel command line to kernel. The NanoNote use U-Boot as bootloaders.
More information on u-boot can be found at
in openwrt run:
$make package/uboot-xburst/compile V=99
it's will generate two files in bin/xburst :
 is for the NanoNote nand flash. to reflash the uboot to nanonote, first boot nanonote to usbboot mode by
$sudo usbboot -c "boot;nprog 0 openwrt-xburst-qi_lb60-u-boot.bin 0 0 -n
 is for the NanoNote ram. we can use xbboot to upload this image to nanonote. first boot nanonote to usbboot mode then run:
$sudo xbboot -u 0x80100000 /PATH/TO/openwrt-xburst-qi_lb60-u-boot-for-xbboot.bin
 Boot Mode
- [POWER] + [U] goto USB BOOT mode
- [POWER] + [S] enable serial console. bootloader wait input from Serial Console for 3 secs.
- [POWER] + [M] boot from SD card. load the kernel form sd card partitions 1 with kernel name uImage. boot the ROOTFS at SD card second partition and this partition must be ext2, after this commit, 2010-05-30 16:15:38. boot from sd card will load kernel from first ext2 partition with /boot/uImage.