How to solve the problem of U-boot stopping at starting kernel by USING DDR3 K4B4G1646D 1600MHZ

Hi,

Which Linux version are you running? Can you post the log file to see where kernel boot stops?

Hi,

Linux version： 3.2.0-gc4a6536-dirty
message stop at：  Starting kernel ...

u-boot file：arch\arm\lib\bootm.c   ---->    int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)   ---> boot_jump_linux(images);    stop at  these function.

we have already done some test：no matter in u-boot or kernel , once do "dcache on", will crash

HI, Dear Biser,

        Do you see my reply?For this question,I have lasted for about one week.Could you give me some suggestion?Look forward to your reply.

     Best regards.

Have you verified the timing settings for the two types of memory you are using (the "AM335x_DDR_register_calc_tool" Excel table)?

Dear Sir，

             Yes，we have checked  timing settings for many times.There are a little difference for two types.And I used the "AM335x_DDR_register_calc_tool" Excel table)tool which Ti provide for us.Using CCS software,both settings are ok.Do you have the same sample for 1600M DDR3 ?Is it ok for running on 303M ?

Thanks.

_{Yes,right.So I use 3.3ns memory CK for DDR3.Can I give you my two types SAMSUNG DDR3 data sheet and also the time setting table?Could you help me to check wether it is ok?}

_{Thank you very much.}

7028.two types of samsung DDR3 on two board.rar

Can you post the two Excel tables too?

7610.AM335X_excel.zip

Are you using the same timing for both memories?

I'm attaching the timing settings for both types of memories as I took them from the datasheets.

6765.AM335x_DDR_register_calc_tool_DDR3-1600.xlsx

3007.AM335x_DDR_register_calc_tool_DDR3-1066.xlsx

 Dear Biser,

      You are so kind that you give me help.I will try to test your two types of  timing settings.Thank you very much.

Any result,I will tell you ASAP.

     By the way,I want to know which timing configuration is the most important,SDRAM_TIM_1,SDRAM_TIM_2,or SDRAM_TIM_3?0777.RatioSeed_AM335x_boards.xls

    Finally,please see my another doc,"RatioSeed_AM335x_boards.xls"in attchment.Is it right?Thank you.

Best regards.

HI,BIser,

      OK,I got it.Good morning on your time.I will test your files tomorrow.Thanks

The GEL file should be used as is, it should not be modified.

HI，Biser，

       I am sorry to tell you that we have tested the settings "AM335x_DDR_register_calc_tool_DDR3-1600.xlsx" you  gave me.But the error is the same on the board of 1600MHZ memory.The info as following:

     But on the old board using 1066MHZ memory,it is ok as usual.

     So I think that maybe we can not focus on the memory parameters.Is that right?

I'm sorry to hear this. I'm out of ideas, I'm afraid.

Dear Biser，

         Thank you.Through tracing the code,I found the reason of DCache on error is that: enable MMU failed.

You can see that it stops at two yellow lines above"Set_cr(reg|CR_M) ".Do you have any idea about that?Why?

Sorry, I'm not a Linux expert and cannot help on this.

Ok,you are welcome ,Biser,Thank you very much!