topic Re: Single channel LPDDR4 in i.MX Processors

Single channel LPDDR4

kayiyeh — Fri, 09 Nov 2018 03:09:20 GMT

Can i.MX8 support single channel LPDDR4? If can, how?

Re: Single channel LPDDR4

Yuri — Mon, 12 Nov 2018 09:58:00 GMT

Hello,

LPDDR4 is essentially dual channeled; using single channel means
half of memory is lost.

Have a great day,
Yuri

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Re: Single channel LPDDR4

kayiyeh — Wed, 14 Nov 2018 00:15:58 GMT

Dear Yuri,

Yes I understand the impact of the single channel to dual channel. However, what if I under some special condition and have to do that (single channel)? The special condition may mean a downgrade memory chip was mounted to board and it happens to have one bit data bus stuck at zero. So back to my original question, can I use single channel LPDDR4? If I use Linux to boot up, do I need to rebuild the kernel or just change some configurations in uboot?

Kayi

Re: Single channel LPDDR4

Yuri — Thu, 15 Nov 2018 05:25:14 GMT

Hello,

Since LPDDR4 device consists of two identical channels operating independently, it is possible to

configure single channel x16 mode. But we do not have tested example for it. Customers can try

i.MX 8M DDR Tool Release

As for Linux - refer to chapter "Porting U-Boot" in "i.MX_BSP_Porting_Guide.pdf" in NXP Linux doc

package.

Regards,

Yuri.

Re: Single channel LPDDR4

sbmd_1234 — Wed, 14 Feb 2024 10:44:55 GMT

Hi
How can we check the lpddr is used whether it is single channel or dual channel in the SW configurations in my yocto project ?