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

As already replied in your other thread, we are coming up with the support by Nov.

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 with bootaux, I try to boot Linux on the A7 ('run bootcmd' from uboot prompt) and it hangs at Starting Kernel...

Is running the A7 and M4 simultaneously currently supported?

I was able to get this working by adding imx7d-sdb-m4.dtb to KERNEL_DEVICETREE of the imx7s-warp.conf in source/meta-fsl-arm-extra/conf/machine

KERNEL_DEVICETREE = "imx7s-warp.dtb imx7d-sdb-m4.dtb"

Good to know.  What compiler are you running to program the board?  I'm also using the Warp7 reference for a commercial design.  It looks like support is very spotty so maybe we should collaborate and help each other out.

We are using gcc and g++ to compile freertos. I was able to setup eclipse (KDS) with some minor tweaking to this guide. I was able to get it working by adding __FPU_PRESENT=1 and ARM_MATH_M4 to the preprocessor defined symbols in eclipse. Then I just take the bin and copy to the fat partition containing the *.dtb's, zimage, etc and place it here. Here is our uboot variables which I copy and paste in manually at the moment for the M4.

setenv m4image 'hello_world.bin'

setenv m4loadaddr '0x7F8000'

setenv loadm4image 'fatload mmc ${mmcdev}:${mmcpart} ${m4loadaddr} ${m4image}'

setenv m4boot 'run loadm4image; dcache flush; bootaux ${m4loadaddr}'

saveenv

run m4boot

run bootcmd

If you would like uboot to boot the M4 auto then just add:

     setenv bootcmd 'run m4boot; '${bootcmd}

Save changes (type printenv to see changes):

     saveenv

You could also add the below line to <BUILD_DIR>/conf/local.conf if you are using yocto:

KERNEL_DEVICETREE_append =" imx7d-sdb-m4.dtb"

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

Would it work with Debian Linux?  My customized Warp7 board now uses Debian.

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

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,