Linux DTB support to run Cortex A7 and Cortex M4 simultaneously on WaRP 7

vnr1992 over 9 years ago

Hi All,

On WaRP 7 board, I am trying to run Linux on Cortex A7 and RTOS based binary on Cortex M4.

I need to run both of these cores simultaneously.

While doing this, I followed below steps...

1) Run U-boot on A7

2) Load M4 binary in TCM attached to M4 using fatload command on Uboot.

3) Run M4 core by bootaux <image addr>

(At this stage M4 binary is successfully executed.)

4) run bootcmd on Uboot console to run Linux image.

At this stage, I am not able to run linux image and kernel is not be able to boot.

I looked in support for other NXP based boards. They are providing support for separate linux device tree blob (dtb) for this purpose with which it let M4 run simultaneous binary.

Does anyone aware about this kind support for WaRP7 board?

Thank you for your help in advance.

Regards,

Vivek

Top Replies

griff0417 over 9 years ago +1

I seem to be having a similar issue. I got FreeRTOS from https://github.com/WaRP7/FreeRTOS_WaRP7 and was able to build and boot the hello_world example on the M4 without any issues. However, after booting…

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0 texierp over 8 years ago

Hi All,

Just for your information, all the support for A7/M4 is now ok with the meta-warp7-distro (https://github.com/WaRP7/meta-warp7-distro/commit/ff8a2cfe7d902b1ed2155d1c28e82f2b99414b8c#diff-dfb22962245d7f5ae492b643… )

Do not hesitate to contact me if you have any questions

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Pierre-Jean
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0 hanooi over 8 years ago in reply to texierp

Would it work with Debian Linux? My customized Warp7 board now uses Debian.
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0 texierp over 8 years ago in reply to hanooi

I think, you just have to update your zImage to support RPMsg, see the following patches:

- https://github.com/WaRP7/meta-warp7-distro/blob/master/recipes-kernel/linux/linux-warp7/imx7s-warp/ARM-imx-Add-imx7s-war…
- https://github.com/WaRP7/meta-warp7-distro/blob/master/recipes-kernel/linux/linux-warp7/imx7s-warp/0005-Add-m4-support-a…
- https://github.com/WaRP7/meta-warp7-distro/blob/master/recipes-kernel/linux/linux-warp7/imx7s-warp/0004-Add-m4-support.p…

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Pierre-Jean
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0 mhanuel over 8 years ago in reply to hanooi

Hello hanooi,

I am looking to have debian on imx7, would you give me some advice of how it can be done using yocto? I know of a meta-debian layer but last time I document myself there was no bsp for imx7.

I will appreciate your comments,
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0 hanooi over 8 years ago in reply to mhanuel

The answer is you don't get Debian working with Yocto. Debian is a different Linux. Basically what happened is I formatted Debian over Yocto. Yocto is gone.

I paid a professional developer to have a Debian BSP made for my custom Warp7. Now things are so much better. Yocto is a total pain. With Debian, my Warp7 is like a Raspberry Pi or BeagleBone. I'm able to take a Pi book and do much of the same with my Warp7.

The books and documentation I found on Yocto are all really lame and I could barely do anything with it.
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0 mhanuel over 8 years ago in reply to hanooi

Hello Han Ooi,

Just to clarify, Yocto is not a Linux distribution, It's a platform that help you build Linux system for embedded devices. Yocto is a pain if you see it the way you looked at it, which I think was the wrong way because it need to be setup correctly, which was exactly what did the professional service company you use for having debian.

I agree with you about documentation, sometimes tend to be very obscure.

By the way you can create debian using Yocto, there is a layer meta-debian.

https://github.com/meta-debian/meta-debian
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0 hanooi over 8 years ago in reply to mhanuel

Ok, thanks for the correction! I never found any documentation on how I could create Debian using Yocto.
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0 hanooi over 8 years ago in reply to mhanuel

Ok, thanks for the correction! I never found any documentation on how I could create Debian using Yocto.
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