U-Boot env save error

[r4ms]

I did find the problem and made a PR request to the main repository

https://github.com/m-weigand/u-boot-pinenote

After patching we get

> env save
Saving Environment to FAT...
writing uboot.env
FAT: Misaligned buffer address (00000000eb9eed70)
done

Despite the error, saving the environment and restoring on boot seems to work.