Khadas VIM3/VIM3L contains a 16 MB SPI-Flash that’s used as boot storage; so you can boot from it. This guide is about how to boot from the on-board SPI-Flash.
The U-Boot for SPI-Flash is the same as eMMC U-Boot. We recommend using Fenix Script to build U-Boot, as it’s easy this way.
This guide assumes that you have already setup a basic build environment. If not, please refer to Fenix Usage.
- Setup Environment:
$ cd fenix
VIM3L board(This is according to your board).
- Build U-boot
$ make uboot
If successful, you will get a U-Boot for the SPI-Flash
u-boot.bin, in the directory
u-boot.bin to an SD-Card or Thumbdrive (U-Disk) and insert it into your board or load it via TFTP.
Setup serial debugging tool and boot to the U-Boot Command Line.
- Load U-Boot from SD-Card:
kvim3#load mmc 0 1080000 u-boot.bin
- Load U-Boot from Thumbdrive (U-Disk):
- Load U-boot via TFTP
Please refer here about how to setup the TFTP.
kvim3#tftp 1080000 u-boot.bin
Tip: This will take a few seconds, please be patient.
If you want to boot from SPI Flash, you have to setup the bootmode to SPI. The default bootmode is boot from eMMC.
- Check current bootmode:
kvim3#kbi bootmode r
Current bootmode is boot from eMMC.
- Setup bootmode to SPI:
kvim3#kbi bootmode w spi
Poweroff the system to make it available:
POWER key to bootup, you will boot from the SPI-Flash.
Bootmode is boot from SPI, but the u-boot in SPI flash is corrupted, can’t enter u-boot command line.
Don’t use your PC to supply the power, or you will enter usb burning mode!
U-boot in eMMC is also corrupted, you have to try TST mode to enter usb burning mode, and flash the image to emmc, then follow
You need to connect the board to your host PC!