topic Re: iMX8QM Yocto boot in i.MX Processors

iMX8QM Yocto boot

jishin42 — Fri, 09 Oct 2020 21:15:05 GMT

Hello,

I've bought an iMX8QuadMax and I try to recompile the kernel following : https://www.nxp.com/docs/en/user-guide/IMX_YOCTO_PROJECT_USERS_GUIDE.pdf

I tried to follow the most standard configuration (DISTRO=fsl-imx-xwayland, bitbake imx-image-multimedia), it compiles till the end without any errors.

However, once I 'dd' the wic file from the deploy directory to the SD card, there is nothing showing up on the console nor on the HDMI output. With the linux binary from NXP, uboot and linux boot perfectly, so I know my setup is correct (uart drivers, boot switches, cables...)

My questions are :

- do I miss a step to include u-boot or any secure boot in the bitbake process ?

- is there anyway to verify that the wic file embeds uboot ?

Thank you

Re: iMX8QM Yocto boot

Zhiming_Liu — Sat, 10 Oct 2020 01:45:59 GMT

Hi,

The correct configuration is DISTRO=fsl-imx-xwayland MACHINE=imx8qmevk source imx-setup-release.sh -b build-xwayland.

After you build success, the binary file is correct.

Best Regards,

Zhiming

Re: iMX8QM Yocto boot

jishin42 — Sun, 11 Oct 2020 21:12:31 GMT

Yes, I typed this exact line to prepare the build-xwayland directory, then I built with "bitbake imx-image-multimedia".

However, there is nothing coming from the console when I dd the wic file to the sd card.

How can I be sure that uboot is included in the wic file ?

Re: iMX8QM Yocto boot

Zhiming_Liu — Mon, 12 Oct 2020 01:34:32 GMT

Hi,

When you build image successfully,the uboot is contained in wic file.

1.Please put your dd command

2.Check if you set the correct boot mode(SD Boot Mode).

Re: iMX8QM Yocto boot

jishin42 — Mon, 12 Oct 2020 15:57:27 GMT

sudo dd if=./fsl-image-multimedia-imx8mqevk-20201009141009.rootfs.wic of=/dev/sdc bs=1M conv=fsync

The jumpers on the card are OK as the binary image provided by NXP boots fine (3=ON, 4=ON, other=OFF)

By the way, I found some command on Yocto website :

wic ls fsl-image-multimedia-imx8mqevk-20201009141009.rootfs.wic

It returns :
Num Start End Size Fstype
1 8388608 95629311 87240704 fat16
2 100663296 2300739583 2200076288 ext4

Is the first partition uboot ?

Re: iMX8QM Yocto boot

Zhiming_Liu — Tue, 13 Oct 2020 02:25:35 GMT

Hi,

Change SW801 to switch the board back to 1100 (SD boot mode),1=ON,2=ON,3=4=OFF

Re: iMX8QM Yocto boot

jishin42 — Tue, 13 Oct 2020 08:13:15 GMT

According to the picture, there is no reason to change the switches. Furthermore, the iMX boots correctly when I use the NXP binary file available on the MEK main page from the NXP website.

Never the less, I tried the proposed switch option, but it still does not boot...

Re: iMX8QM Yocto boot

Zhiming_Liu — Tue, 13 Oct 2020 08:36:56 GMT

OK,I will test this problem,please wait for a moment

Re: iMX8QM Yocto boot

Zhiming_Liu — Tue, 13 Oct 2020 08:43:03 GMT

I found that your board is 8QM,but the image you made is 8MQ,you check it

Re: iMX8QM Yocto boot

jishin42 — Tue, 13 Oct 2020 15:38:35 GMT

Thank you, that was my mistake.

For reference, the correct command lines are :

DISTRO=fsl-imx-xwayland MACHINE=imx8qmmek source imx-setup-release.sh -b build-xwayland

bitbake imx-image-multimedia