AM2434: MCU-PLUS-SDK-AM243X: Can AM243X use OSPI PSRAM as memory extention for CODE

Hi Winson,

Yes, most of the code can be kept in OSPI PSRAM.

We have a custom working example using SD Card Boot wherein the following steps are performed:

1. During SD Card bootup, Application code contents is copied to MSRAM.

2. Inside MSRAM, we initialize PSRAM and OSPI drivers.

3. The code part to be transferred to PSRAM is then written to the PSRAM memory.

4. After which, the CPU can execute the code contents directly from PSRAM.

Would this workflow work in your usecase?

Regards,

Aryamaan Chaurasia

Hi Aryamaan, thanks so much for quick reply do you have bootcode in gpmc nor flash then in that bootcode we do steps 2-4 in your workflow?  

Hi Winson,

We do not support Booting from GPMC in the MCU+ SDK for AM243x/AM64x devices, since the boot time takes a very long time and is not optimal.

Regards,

Aryamaan Chaurasia

I dont know whether i should open another ticket or can we just continue from here. Due to some technical limitation we need to use GPMC NOR Flash for booting.  Are you able to quantify what very long time means in terms of MB/s?  our previous design not sitara boots using spi or qspi @ 15Mhz spi clock using spinorflash , binary size is ~2 -3MB probably under 1 second but more than but maybe more than 300ms...  for us this is good enough.    Please tell us if you see any technical issue with this.

Hi Winson,

For AM243x/AM64x, the ROM itself does not support the GPMC Bootmode. Can you please create a new thread for GPMC issues and questions? The GPMC expert will then be assigned to it. 

We can use this thread for any OSPI PSRAM questions or issues.

Regards,

Aryamaan Chaurasia

Hi Winson,

Please find the attached code and examples.

PSRAM.zip

Regards,

Aryamaan Chaurasia

Hi Aryamaan,

currently our side is using AM64x evm which we have plenty off. is it okay if you guide us how to import the project you gave us to am64x evm /sdk? We tried to import it but no success

Hi Winson,

Directly importing the example wont work as the example is from the AM243x MCU+ SDK. To use the same example with AM64x, some changes would have to be made.

Can you please let me know if you a custom AM243x board with a PSRAM attached to it or a custom AM64x board with a PSRAM attached to it?

And can you also let me know the SDK and its version your team would be using for testing?

Regards,

Aryamaan Chaurasia

We are using AM64x with daughter board there is mention PROC101E1 but definitely the chip is AM6442 that is mounted.  Thanks in Advance apologize that i was asking for AM2432 that is the final product wwe want to use but over our side all developer using AM64x-EVM. 

Hi Winson,

Thanks for the update. We can discuss about the code and the questions on the call scheduled today at 2pm IST.

Regards,

Aryamaan Chaurasia