Compiler/DRA750: Clock configuration of DRa7xx

Pawel Sawa

Part Number: DRA750

Tool/software: TI C/C++ Compiler

Hi,
I am developing the DR750 (exactly 5777g development board). I run the linux exmaple and checked the speeds of AES encryption and it gave results:

The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
aes-128-cbc 50543.57k 222789.33k 374471.68k 434548.36k 4665753.60k

command:
openssl speed -evp aes-128-cbc

When I run my simple project on BIOS and use ported OPenSSL AES I get results around 25MB/s (packets 1024 bytes). Linux is 8x time faster. could it be beacuse linux is running with higher clock speed? Is there a way to speed up the Cortex-A15 clock?

Regards,
Pawel

over 7 years ago

0 Yordan Kamenov over 7 years ago

TI__Mastermind 42515 points

Hi Pawel,

which are the SDK's you use in both cases?

Regards,
Yordan

0 Pawel Sawa over 7 years ago in reply to Yordan Kamenov

Prodigy 150 points

Hi Yordan,

For Linux I am using the:
http://downloads.ti.com/infotainment/esd/jacinto6/processor-sdk-linux-automotive/03_04_00_03/index_FDS.html

My implementation is using RTOS SDK:
processor_sdk_rtos_dra7xx_4_01_00_06
bios_6_46_05_55

All is running on cortex A15. My main question is it is possible that linux runs on cortex A15 but with higher clock rate than my RTOS? If it is true how can I change clock speed for RTOS?

Regards,
Pawel

0 Stephen Molfetta over 7 years ago in reply to Pawel Sawa

TI__Expert 5725 points

Hi Pawel,

Which OPP mode are you using the SBL? In this SDK version, the default sbl build will set to OPPMODE=opp_nom, which configures A15 frequency to 750 MHz. If you use opp_od or opp_high, A15 will run at 1.176 GHz.

Thanks,
Stephen

0 Pawel Sawa over 7 years ago in reply to Stephen Molfetta

Prodigy 150 points

Hi Stephen,

I was using opp_norm. I have switched to opp_high and Now the encryption speeds are a bit better.

Thanks,
Pawel

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Compiler/DRA750: Clock configuration of DRa7xx