u-boot/board/technexion/pico-imx7d
Vanessa Maegima 0bfd4f81ae pico-imx7d: Add "how to boot with NXP 4.1 Kernel"
The NXP 4.1 kernel needs to boot with secure boot.

Add information on how to enable secure boot mode.

Signed-off-by: Vanessa Maegima <vanessa.maegima@nxp.com>
2017-09-18 17:15:28 +02:00
..
imximage.cfg pico-imx7d: Add initial support 2017-05-31 09:58:40 +02:00
Kconfig pico-imx7d: Add initial support 2017-05-31 09:58:40 +02:00
MAINTAINERS pico-imx7d: Remove bouncing email 2017-06-29 21:30:16 -04:00
Makefile pico-imx7d: Add initial support 2017-05-31 09:58:40 +02:00
pico-imx7d.c imx: imx7d: remove CamelCase from ENET_xMHz macros 2017-09-18 17:15:28 +02:00
README pico-imx7d: Add "how to boot with NXP 4.1 Kernel" 2017-09-18 17:15:28 +02:00

How to update U-Boot on pico-imx7d board
----------------------------------------

Required software on the host PC:

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

Build U-Boot for pico:

$ make mrproper
$ make pico-imx7d_defconfig
$ make

This generates the U-Boot binary called u-boot.imx.

Put pico board in USB download mode (refer to the PICO-iMX7D Quick Start Guide
page 3)

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 starts and its messages appear in the console program.

Use the default environment variables:

=> env default -f -a
=> saveenv

Run the UMS command:
=> ums 0 mmc 0

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

$ sudo dd if=u-boot.imx of=/dev/sdX bs=1K seek=1; sync

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.

Building U-Boot to boot with NXP 4.1 kernel:

The NXP 4.1 kernel boots only in secure boot mode on mx7.

Follow the next steps to enable secure boot:

$ make mrproper
$ make pico-imx7d_defconfig
$ make menuconfig
	-> ARM architecture
	-> [*] Enable support for booting in non-secure mode
	-> [*]   Boot in secure mode by default
	-> Exit
$ make

Flash u-boot.imx using the imx_usb_loader tool.