[meta-freescale] [3rdparty][PATCH v2] imx7d-pico: Add machine configuration (booting)

[Takashi Matsuzawa]

Hello.
I am now trying this with my board and want to make sure if what I am doing is correct.

>Add machine definition for imx7d-pico board.
>
>For more information about this reference design, please visit:
>
>https://www.wandboard.org/products/android-things/PICO-PI-IMX7/

My local build creates wic.gz file (core-image-minimal-imx7d-pico.wic.gz).

1) This is expected to be a one-partition disk image with an ext4 partition in it?

(I can see no fat partition for #1, only one ext4 partition.  Is this expected?)

2) In serial download mode, I could boot the board using u-boot (using imx_usb loader tool, by pushing u-boot.imx data to the board).

3) However, I am failing to boot it from eMMC.

I have written u-boot data to 1K offset on the eMMC (/dev/sdc as it is mounted on the host).
So, at least it should boot into u-boot, but it does not.

Though looking into hardware manuals for PICP-PI-IMX7, I am seeing conflicing information on which is the eMMC boot mode setting on the J1/J2 jumpers,
I tried them but non worked.

The board as deliverd booted into the default Linux (provided by technexsion), so the problem is not hardware.
(Unfortunately, I did not take not of the default jumper setting or data of pre-installed boot loader)

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