Single channel LPDDR4

[kayiyeh]

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

[kayiyeh]

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

[Yuri]

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.

[Yuri]

Hello,

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

Have a great day,
Yuri

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[sbmd_1234]

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 ?