Using AM3352 cpu with DDR3 300Mhz

Hi,

Imran Khan14 said:

 Particularly function read_eeprom() which try to read from eeprom chip which we have on our board board but seems to did not contain CPU ID, Magic num, Name, Version etc.

Have you tried programming your eeprom, using the following guide: processors.wiki.ti.com/.../AM335x_Starter_Kit_ID_Memory_Programming

Another option is to remove all EEPROM related code from u-boot.

Best Regards,
Yordan

Hi,

Did you tune your DDR3 following these guidelines:

http://processors.wiki.ti.com/index.php/AM335x_EMIF_Configuration_tips

http://processors.wiki.ti.com/index.php/AM335x_DDR_PHY_register_configuration_for_DDR3_using_Software_Leveling

You can find a step-by-step tutorial how to do this here: http://processors.wiki.ti.com/index.php/Sitara_Linux_Training:_Tuning_the_DDR3_Timings_on_BeagleBoneBlack

Hi Biser n Yordon,

Thank you very much for your response which propelled me bit further in my current problem but not fully.

However, I managed to tune my custom board which happened to be using DDR2 instead of DDR3 as completing following procedure prescribed.

1/ AM335x EMIF Configuration tips
processors.wiki.ti.com/.../AM335x_EMIF_Configuration_tips

AM335x DDR PHY register configuration for DDR3 using Software Leveling
processors.wiki.ti.com/.../Sitara_Linux_Training:_Tuning_the_DDR3_T

It revealed that the memory DDR running 266Mhz instead of 303Mhz and its rest of data provided by Alliance AS4C256M16D3 chipset.

STILL ISSUE and an OLD PROCEDURE IN WIKI
========================================
processors.wiki.ti.com/.../Sitara_Linux_Training:_Tuning_the_DDR3_T

The above wiki has Procedure "Updating SPL/U-Boot" procedure which did not conform according to TI's SDK as provided for U-boot; the Step no 2, looking for the function s_init did not exists in ...board/ti/am335x/board.c directory

The step 5 required to modify first parameter config_ddr function call from 266-400
the code snippet:

/* initilise theboard header */
enable_i2c_pin_mux(); /* this function does not exists in my board.c*/
config_ddr(400, MT47H128M16RT25E_IOCTRL_VALUE, &ddr2_data,
&ddr2_cmd_ctrl_data, &ddr2_emif_reg_data);
while(myVar);
#endif
}


IS THE ABOVE code require modification to the board.c of ..../am335x/
IN THIS SAME file cannot locate function s_init()

I will be grateful you please shed a light on this issue which is rather confusing.

Thank you,

IK

Hi Yordan,

Although there were quite lot function seems to call the function read_eeprom() before processing ie, ether net port, DDR init and rest.
I assume removing altogether read_eeprom will not affect the boot process? OR you thing programming Starter KIT info as your link suggest?
Thank you,

Imran,

For DDR2 the Software Leveling procedure is not required and will not work.

Hi Yordan,
The provided link with starter kit MLO file does not get loaded into the target board nor app file as the target board currently only able to load spl part of uboot, I hoped I may create magic num, board name serial num etc using the above link but board fail to load said files. IS there any other way to write eeprom on board?
Please advise, thank you.