i.MX ProcessorsのトピックRe: iMX8MP + DDR4 : Why or why not?

iMX8MP + DDR4 : Why or why not?

khang_letruong — Mon, 30 Jan 2023 16:43:38 GMT

Dear Experts,

While being stuck with the booting up from SD card of own custom board based on iMX8MP + DDR4, I would like to have your opinion about why there seems to be only iMX8MP + LPDDR4 from NXP partners and SOM makers? And for iMX8MP + DDR4 combination, there's only internal boards such as imx8mp-ddr4-evk or the iMX8M Plus AI Robot which are only for internal use?

Anyway, the DDR4 training and initialization are successfully passed on our custom board. But u-Boot SPL is stuck at loading the ATF/BL31 as this later could not be found (magic word is incorrect).

Thanks in advance and best regards,
Khang

Re: iMX8MP + DDR4 : Why or why not?

Tperman_msi — Tue, 07 Feb 2023 12:10:37 GMT

Hi,

I am in the process of defining the architecture of a new PCB using the iMX8MP.

I have had the same observation as you regarding the lack of iMX8MP + DDR4 designs from NXP and SoM designers. I also note that there is less detail in the application notes regarding a DDR4 based design. For example, the routing recommendations in the Hardware Design Guide appear to cover LPDDR4 only.

I also notice the following note in the HDG Table 3. "It is strongly suggested to use LPDDR4 if lower power consumption is required since DLL-off mode is not supported". This may help explain why there is a preference for LPDDR4.

Did you manage to resolve the issues you have faced?

Thanks,

Tom

Re: iMX8MP + DDR4 : Why or why not?

khang_letruong — Tue, 07 Feb 2023 12:36:56 GMT

Hi @Tperman_msi ,

I am in the process of bringing up a custom iMX8MP + DDR4 based board, inspired from imx8mp-ddr4-evk. Currently we are receiving the help from NXP technical support but there's not been important progress in resolving the issue yet.

Regards,
K.

Re: iMX8MP + DDR4 : Why or why not?

Rita_Wang — Wed, 15 Feb 2023 07:56:31 GMT

@khang_letruong How is the status in your side?

Re: iMX8MP + DDR4 : Why or why not?

khang_letruong — Wed, 15 Feb 2023 11:16:37 GMT

Dear @Rita_Wang ,

Unfortunately we are still being blocked due to ATF (BL31) not found. We are also being supported by NXP Technical Support but nothing special has been found yet.

Regards,
Khang

Re: iMX8MP + DDR4 : Why or why not?

Rita_Wang — Thu, 16 Feb 2023 04:53:36 GMT

Dear @khang_letruong,

Our another engineer is dealing it for you. Any question you can contact him freely.

Wish you have a nice day

Best Regards

Rita