topic Re: DDR3 Custom Board Configuration in i.MX Processors

DDR3 Custom Board Configuration

sayi — Thu, 02 Jun 2016 21:25:41 GMT

Hello NXP Team,

I am trying to bring up a custom board which is using imx6 solo processor with different DDR3 SDRAM Configuration

I am trying to understand the following settings on SABRE solo board . Could you please explain

0x21b001c = 0x04008032

0x21b001c = 0x8033

0x21b001c = 0x48031:

Thanks,

Says

Re: DDR3 Custom Board Configuration

igorpadykov — Fri, 03 Jun 2016 01:12:18 GMT

Hi Says

these records performs programming DDR chips Mode registers,

description can be found in sect.45.12.8 MMDC Core Special Command

http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6SDLRM.pdf

and datasheets of used DDR parts.

Best regards

igor

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Re: DDR3 Custom Board Configuration

sayi — Fri, 03 Jun 2016 02:39:22 GMT

Thank you Igor.

I already saw the reference manual but I am a bit confused with mode register setting.

For Ex: 0x21b001c = 0x04008032

The mode register address is 0x0400 and I couldn't figure this address from the DRAM manufacturer data sheet.

Could you please help?

Re: DDR3 Custom Board Configuration

igorpadykov — Fri, 03 Jun 2016 02:57:44 GMT

Hi Says

one can find in comments attached file:

// Mode register writes

setmem /32 0x021b001c = 0x04008032 // MMDC0_MDSCR, MR2 write, CS0

~igor

Re: DDR3 Custom Board Configuration

sayi — Fri, 03 Jun 2016 14:20:28 GMT

Thanks. This was helpful.

- Can we use JTAG to initialize memory? Are there any scripts for JTAG and recommendations from freescale to bring up a custom board based on solo.?

I am looking at the uboot code board configuration files and they are *.cfg files with Device configuration Tables is this the only place to change the needed for custom board.

Appreciate your time!!

Re: DDR3 Custom Board Configuration

igorpadykov — Fri, 03 Jun 2016 15:06:52 GMT

please look at

https://community.freescale.com/docs/DOC-105652

~igor

Re: DDR3 Custom Board Configuration

sayi — Fri, 03 Jun 2016 20:05:53 GMT

Thanks Igor !! One final question before I close this topic.

- From BSP porting document for configuring DDR3 I see free-scale mentioned about changing the *.cfg file in boards/mx6solosabresd/*.cfg file but I also see Plugin.s file in the same folder that has the same DCD table as the cfg file and from make file I see we are using plugin.s object file.

For board mx6solosabresd:

Could you please clarify if we should change the DCD table in *.cfg or plugin.s it looks like plugin.s is the assembly version of the *.cfg file.

Thanks,

Swapna

Re: DDR3 Custom Board Configuration

igorpadykov — Tue, 07 Jun 2016 01:50:22 GMT

Hi Swapna

both options are equal, one can use them

on own choice.

Best regards

igor