| How to use U-BOOT on SeeedStudio NPI-IMX6ULL Single Board Computer |
| ------------------------------------------------------------------ |
| - Configure and build U-Boot for NPI-IMX6ULL: |
| $ export CROSS_COMPILE=arm-none-linux-gnueabihf- |
| $ make seeed_npi_imx6ull_defconfig |
| This will generate SPL and u-boot-dtb.img images. |
| - The SPL and u-boot-dtb.img images need to be flashed into the micro SD card: |
| $ sudo dd if=SPL of=/dev/mmcblk0 bs=1k seek=1; sync |
| $ sudo dd if=u-boot-dtb.img of=/dev/mmcblk0 bs=1k seek=69; sync |
| Boot switch position: SW1 -> 0 |
| - Boot the board using SD/MMC or Serial download and load the SPL into memory |
| either from SD/MMC or TFTP. |
| Default MTD layout is 512k(spl),1m(uboot),1m(uboot-dup),-(ubi) |
| Flash SPL to NAND from SD/MMC, |
| $ ext4load mmc 0:2 $loadaddr SPL |
| $ nandbcb init $loadaddr 0x0 $filesize |
| Flash u-boot image to NAND from SD/MMC, |
| $ ext4load mmc 0:2 $loadaddr u-boot-dtb.img |
| $ nand write $loadaddr uboot $filesize |
| Boot switch position: SW1 -> 0 |
| - Connect the Serial cable to UART0 and the PC for the console. |
| - Reset the board using reset button and U-Boot should boot from NAND. |