topic Re: Custom IMX8MM board with DDR4 + Yocto in i.MX Processors

Custom IMX8MM board with DDR4 + Yocto

AlekseyM — Mon, 08 May 2023 08:24:48 GMT

Hi! I created a my custom IMX8MM board with DDR4. All DDR4 tests passed successfully in Configuration tools for IMX.
I am trying to make a u-boot for my board by Yocto. I take an IMX8MM_DDR4_EVK as starting point. But it is my first experience with Yocto.
Which files and where should I change or/and add to layers? It looks like I should change the Device Tree and config file for DDR4.
Can anyone give me a hint?

Re: Custom IMX8MM board with DDR4 + Yocto

joanxie — Mon, 08 May 2023 09:16:19 GMT

pls refer to the enclosed file

Re: Custom IMX8MM board with DDR4 + Yocto

AlekseyM — Mon, 08 May 2023 15:05:59 GMT

Okay. When I do step 5:
Edit the machine configuration file with device trees listed in the KERNEL_DEVICETREE.

Below code from evk board:

KERNEL_DEVICETREE_BASENAME = "${MACHINE}"

KERNEL_DEVICETREE:append:use-nxp-bsp = " \

freescale/${KERNEL_DEVICETREE_BASENAME}-revb.dtb \

freescale/${KERNEL_DEVICETREE_BASENAME}-revb-rm67191.dtb \

freescale/${KERNEL_DEVICETREE_BASENAME}-revb-rm67191-cmd-ram.dtb \

freescale/${KERNEL_DEVICETREE_BASENAME}-revb-rm67199.dtb \

freescale/${KERNEL_DEVICETREE_BASENAME}-revb-rm67199-cmd-ram.dtb \

"
Where I can find this files? Search in dir imx-yocto-bsp doesn't help

Re: Custom IMX8MM board with DDR4 + Yocto

AlekseyM — Mon, 08 May 2023 13:27:54 GMT

The same question for 3.2.1 Changing the DCD table for i.MX DDR initialization
I try to find mx6q.cfg
Also, step 6 says, what I should change SPL. Where I can find a guide?

Re: Custom IMX8MM board with DDR4 + Yocto

joanxie — Tue, 09 May 2023 04:54:05 GMT

pls download yocto bsp according to the enclosed file, you can find all of source code there

Re: Custom IMX8MM board with DDR4 + Yocto

AlekseyM — Tue, 09 May 2023 12:03:26 GMT

Thanks. What do I need to change the device tree? Do you have some guides for this or tools? Appnote AN5125 acceptable for IMX8MM?

Re: Custom IMX8MM board with DDR4 + Yocto

joanxie — Wed, 10 May 2023 08:53:51 GMT

yes, this AN is available for imx8mm, what kind of DDR4 do you use?

Re: Custom IMX8MM board with DDR4 + Yocto

AlekseyM — Thu, 01 Jun 2023 09:57:36 GMT

AS4C512M16D4-75BCN