u-boot/board/technexion/pico-imx6ul
Fabio Estevam 82a8a93327 pico-imx6ul: Convert to SPL
There are two versions of imx6ul pico SOMs: one with 256MB and another
one with 512MB of RAM.

Convert to SPL so that both versions can be supported. This patch
doesn't rework the clock initialization to avoid changing the behavior
in this same patch, so it will be cleaned up in future.

Currently only the 256MB is tested/supported.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Fabio Berton <fabio.berton@ossystems.com.br>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
2018-09-14 15:04:24 +02:00
..
imximage.cfg SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
Kconfig Add initial support for Technexion's PICO-IMX6UL-EMMC board 2016-04-19 16:37:36 +02:00
MAINTAINERS Add initial support for Technexion's PICO-IMX6UL-EMMC board 2016-04-19 16:37:36 +02:00
Makefile pico-imx6ul: Convert to SPL 2018-09-14 15:04:24 +02:00
pico-imx6ul.c SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00
README pico-imx6ul: Add a README file 2016-07-12 17:58:49 +02:00
spl.c pico-imx6ul: Convert to SPL 2018-09-14 15:04:24 +02:00

How to Update U-Boot on Pico-imx6ul board
-----------------------------------------

Required software on the host PC:

- imx_usb_loader: https://github.com/boundarydevices/imx_usb_loader

- dfu-util: http://dfu-util.sourceforge.net/releases/

Build U-Boot for Pico:

$ make mrproper
$ make pico-imx6ul_defconfig
$ make

This will generate the U-Boot binary called u-boot.imx.

Put pico board in USB download mode (refer to the document
http://www.wandboard.org/images/hobbit/hobbitboard-imx6ul-reva1.pdf page 15)

Connect a USB to serial adapter between the host PC and pico

Connect a USB cable between the OTG pico port and the host PC

Open a terminal program such as minicom

Copy u-boot.imx to the imx_usb_loader folder.

Load u-boot.imx via USB:

$ sudo ./imx_usb u-boot.imx

Then U-Boot should start and its messages will appear in the console program.

Use the default environment variables:

=> env default -f -a
=> saveenv

Run the DFU command:
=> dfu 0 mmc 0

Transfer u-boot.imx that will be flashed into the eMMC:

$ sudo dfu-util -D u-boot.imx -a boot

Then on the U-Boot prompt the following message should be seen after a
successful upgrade:

#DOWNLOAD ... OK
Ctrl+C to exit ...

Remove power from the pico board.

Put pico board into normal boot mode

Power up the board and the new updated U-Boot should boot from eMMC.