topic Re: change DDR3 from UDIMM to Chip in T-Series

change DDR3 from UDIMM to Chip

mohamadahmadi — Sat, 23 Jul 2016 08:31:01 GMT

Hello everyone,

I am so happy to be here. I have several questions about T1040 processor. I design a board with T1040 but I do not use from the UDIMM memory like T1040RDB. I must use from T1040RDB SDK for U-Boot kernel and ... .

what changes should I set in SDK with new DDR3?

thanks.

Re: change DDR3 from UDIMM to Chip

Pavel — Mon, 25 Jul 2016 05:37:47 GMT

U-boot for the T1040 boards uses SPD for DDR configuring.

See the ddr.zip file in the attachment.

Find the following line in the ddr.h file:

static const struct board_specific_parameters udimm0[] = {

This structure contains the following parameters:

n_ranks, datarate_mhz_high, rank_gb, clk_adjust, wrlvl_start, wrlvl_ctl_2, wrlvl_ctl_3.

Look at the T1023RDB setting in the t102xrdb.h file. Find the CONFIG_SYS_DDR_RAW_TIMING in this file. This setting provides do not use SPD for DDR configuring. See the t102xrdb.h and ddr_t102xrdb.c files for the T102sRDB board from u-boot. See the ddr_raw_timing procedure in the ddr_t102xrdb.c file.

Use similar method for your T1040 board.

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Have a great day,
Pavel Chubakov

Re: change DDR3 from UDIMM to Chip

mohamadahmadi — Mon, 25 Jul 2016 10:03:47 GMT

Thanks Pavel,

Your answer was very helpful, I use the Linux kernel . After u-boot, what changes should I set in Linux kernel with new DDR3?

Thanks again.

Re: change DDR3 from UDIMM to Chip

Pavel — Wed, 03 Aug 2016 10:49:08 GMT

Sorry for delay.

Changes in Linux kernel are not needed.

Have a great day,
Pavel Chubakov

Re: change DDR3 from UDIMM to Chip

atrqua — Tue, 10 Nov 2020 12:32:57 GMT

Hi dear：

I have met a problem about DIMM。

When I boot 1046 ， A NOTICE comes out every seconds like "NOTICE: UDIMM M4DS-AGS1QC0J-BE82".

Have ever met this problem

or Could u plz give me some advances

Thanks

atrqua