AM62L: How to measure DDR throughput on AM62L

 Hi 

This is enabled through our K3conf tools

For AM62x, AM62P,

Please see the following link  https://git.ti.com/cgit/k3conf/k3conf/tree/README.md & https://texasinstruments.github.io/processor-sdk-doc/processor-sdk-linux-AM62X/esd/docs/11_00_09_04/linux/How_to_Guides/Target/How_to_Use_K3Conf_Tool.html

root@am62xx-evm:~# k3conf ddrbw

We also incorporate this in some of out demos example

QT OOB which uses perf_stats.cpp underneath - https://texasinstruments.github.io/processor-sdk-doc/processor-sdk-linux-AM62X/esd/docs/11_00_09_04/_images/ti-apps-launcher-home-am62x.png

Right now the same tooling is not enabled AM62L (it is in our roadmap)

We will try to provide you a stop gap solution for that in coming weeks.

Here info on the FIFO full counters in the DDR Subsystem (Please refer to TRM for register descriptions and addresses)

You can select up to four different counters at one time using EMIF_SSCFG_PERF_CNT_SEL_REG.  There are more than four FIFO full counters (selection numbers 0x1C thru 0x23, so you will have to setup a few test for full coverage, but there is most likely only a subset which are relevant.

The four different counts will end up in these registers: EMIF_SSCFG_PERF_CNT[3:0] REG

The counters are free running, so in order to get a true count, you have to take a snapshot of the registers at the beginning of your test, a snapshot at the end, and look at the difference.

As mentioned on the call, I think a good test would be to run your application with different DDR frequencies.  You can use the DDR Register Configuration Tool: https://dev.ti.com/sysconfig/?product=Processor_DDR_Config&device=AM62L to get configurations at different frequencies.  I would probably choose 800, 667, and 400MHz.

Regards,

James

Hi Rajeena

Sharing the readme file on DDR config on how to change / incorporate changes for 800 MHz or lower

dev.ti.com/tirex/content/Processor_DDR_Config_0.10.01.0000/docs/README.html