topic Re: ddr3 initialization in i.MX Processors

ddr3 initialization

saida — Thu, 03 Dec 2015 04:50:12 GMT

Hi I.MX6 community

i am facing following problems

1. The PMIC is giving more problems , many of IC's in a lot are not working properly some of them giving 0.8 volts output only.

2. i am debugging with arm ds5, suppose in u-boot case, when i am trying to run a u-boot bin file from DDR3 it is hanging randomly.(output on hyper terminal)

in my board i am using mt41k256x16 ddr chip(2GB), i have sabresd board (1GB ram) ddr3 script file which is uing for my board.

is this script works for my board ? if not can any one send the script file for mt41k256x16ha ddr3 chip which is used in sabre ai board.

i am suspecting ddr init is the problem because one standalone uart application running from iram is working perfectly, when from ddr its not .

3.on sabresd board i want to run httpd server application which i found from sdk.its not working

i connected the board directly to pc using rj45 cable. than i made changes to source file http_main.c

a) ip address changed to 172.22.20.61 (my pc ip is 172.22.20.11)

b) i disabled obtaining of ip using dhcp and auto.

C) i selected static ip routine

finally compiled and booting from sd card (i went through readme file)

than for testing i am browsing from mozilla firefox web browser with http://172.22.20.61 but its not working

is any wrong in my procedure or code ?

plz any one can help to up my board

thanks and regards

Saida

Re: ddr3 initialization

igorpadykov — Thu, 03 Dec 2015 08:59:31 GMT

HI saida

this script may not work for your board even with the same ddrs, due to diffrencies

in board material and layout. Recommended to run ddr test

i.MX6/7 DDR Stress Test Tool V2.30

then modify script with calibration settings found from ddr test.

Best regards

igor

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Re: ddr3 initialization

saida — Thu, 03 Dec 2015 12:11:28 GMT

igorpady

thanks for you reply

i think the calibration data from ddr stress test is the reference for script file,board.cfg and mt41k256x16.cfg files.

what about other two problems

thanks and regards

saida

Re: ddr3 initialization

igorpadykov — Thu, 03 Dec 2015 13:38:28 GMT

you described many problems, which

"what about other two problems" are you refering ?

~igor

Re: ddr3 initialization

saida — Fri, 04 Dec 2015 09:16:12 GMT

yes 2 and 3

my ddr calibration is failed with ddr_stress_test_toolv2.30( error: ddr calibration failed)

through u-boot i am downloading file ddr_test_u-boot_jatag_mx6dl.bin to address 0x00907000 iram and running from it

i went through community posts, some of them mentioned that tool compatability issues

my cpu if dual lite

ddr: mt41k256m16

what could be the problem ?

thanks and regards

Saida

Re: ddr3 initialization

igorpadykov — Fri, 04 Dec 2015 09:59:50 GMT

what do you mean by "error: ddr calibration failed" ,

exactly what "calibration": DQS gating calibration, read, write ?

~igor

Re: ddr3 initialization

saida — Fri, 04 Dec 2015 23:31:15 GMT

DQS gating calibration failed

Re: ddr3 initialization

igorpadykov — Sat, 05 Dec 2015 01:57:05 GMT

you can ignore it, if all other tests passed.

Re: ddr3 initialization

saida — Mon, 07 Dec 2015 11:49:24 GMT

no even stress test also failed

error is "written and read data are not matched address failed"

Re: ddr3 initialization

igorpadykov — Mon, 07 Dec 2015 15:36:18 GMT

please check this specific bit (signal line) with oscilloscope

and try to change its drive strength (can be done both from i.MX6 and

ddr side).