• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 99 subscribers
  • Views 475 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Original question:

AM4377: DDR Pin swap

[FAQ] AM625: How to change device tree to incorporate DDR4 Data pin swaps

Mitesh Hiran
Mastermind 6235 points

Part Number: AM625
Other Parts Discussed in Thread: SK-AM62

Hello, I am using AM625 SoC and we have swapped some of the data pins within a byte for the DDR0_DQ* for the DDR4. 

Could you please give us an example on how to change these in the device tree for U-boot / Linux. 

I am currently using SDK 08.06.00.42.

During boot with default settings same as Eval board SK-AM62 booting is stuck at PSCI when it is trying to read version information.

Thanks 

  • +1
    TI__Guru* 92751 points

    It should not be necessary to make any device tree changes on DDR4 to accommodate data bit swizzling.  What are you trying to read from DDR4?  What is PSCI?

    Regards,

    James

  • 0 in reply to JJD
    Mastermind 6235 points

    Hi James, thanks for your reply.

    Good to know we don't need to change anything in device tree for DDR4 data pin swaps. 

    We are having issues with booting and I am trying to see what are the differences in our custom hardware when compare to eval board SK-AM62 and the Power State Coordination Interface (PSCI) is an ARM standard that describes a software interface for power management between an operating system is getting stuck when it tries to read the version number of the firmware.

    I wanted to rule out that this has nothing to do with DDR4.

    Thanks