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

[Takashi Matsuzawa]

Hello.
By the way, I found I could boot successfully using this wic image (only one ext4 partition) by the following.
So, it might have to do something with the boot code  - but I still not sure what being wrong.

1) Connect power (USB-C cable)
2) sudo imx_usb u-boot.imx

Then, the linux successfull boot into the logon prompt.
This seems to work regardless of the J1 jumper setting (so eMMC boot setting is not working and always being serial download mode?)

________________________________
From: Takashi Matsuzawa
Sent: Tuesday, October 3, 2017 6:47 PM
To: Vanessa Maegima; meta-freescale at yoctoproject.org
Cc: desrochers.philippe at gmail.com; festevam at gmail.com; van.ayumi at gmail.com
Subject: Re: [3rdparty][PATCH v2] imx7d-pico: Add machine configuration (booting)


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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