[yocto] Support UBI u-boot

[JH]

Hi Gabriele,

On 2/6/20, Gabriele Zampieri <gabbla.malist at gmail.com> wrote:
> As far as I know uboot (usually virtual/bootloader) does not have a task to
> run menuconfig directly from bitbake.
> I usually have a local clone of uboot and I simply run `make [...]
> menuconfig|savedefconfig` , then I create a patch
> to add my defconfig (custom_defconfig) to configs/ and specify
> UBOOT_MACHINE = "custom_defconfig"

Are there any document to use cross compiler tools to build u-boot-imx
on Ubuntu 18 host machine? It seems that build environment will not be
the same as the Yocto build environment I am currently running on
Ubuntu 18 host.

Thank you Gabriele for great helps.

Kind regards,

- jh