SRIO Different Result From C6670 and C6678

I cannot tell the difference in your code that runs on C6670 v/s C6678.

One key difference to keep in mind is the SRIO Serdes PLL configuration might be different. The C6678 EVM has a 312.5Mhz refclk and the C6670 EVM has a 250Mhz clock.  

You can refer section 2.3.1.1. (Enabling PLL) :  

http://www.ti.com/lit/ug/sprugw1a/sprugw1a.pdf

Hope this helps.

Hi,

Thank you for your reply.

I want to change SRIO_SGMII_CLKP/N frequency to 312.5MHZ.

I rewite below register value:

CSL_BootCfgSetSRIOSERDESConfigPLL (0x229); 

CSL_BootCfgSetSRIOSERDESRxConfig (0, 0x00440495); 

CSL_BootCfgSetSRIOSERDESTxConfig (0, 0x00180795);

But SRIO connect have problem.

Is this correct?

Have any solution for this?

Thank You.

Best Regards.

Hello,

Can you please confirm which EVM/board you are using for C6670 and C6678. 

Assuming you are using Advantech EVMs,

Please see the code snippet below for C6678. This is from MCSDK package :

..\pdk_C6678_1_1_0_0\packages\ti\transport\ipc\examples\srioIpcBenchmark\device_srio.c

    /* Assuming the ref_clock of 312.5 MHz and link rate is 5Gbps; program the PLL accordingly. */

    CSL_BootCfgSetSRIOSERDESConfigPLL (0x241);

Our suggestion would be to first ensure the simple examples that come with MCSDK work fine. Then use them as reference for your customized application.

Also - please give more details about what errors you are seeing.

Hope this helps.

Hi,

Thanks for your reply.

I'm sure used C6670 and C6678 EVM plateform.

When I initially C6670 and C6678 platforms SRIO interface switch can find C6678 device, but can't understand C6670 device.

Switch SRIO reference frequence is 312.5MHZ,

How can I change C6670 EVM SRIO reference frequence?

Thank You

best Regards,

Hi,

The EVM reference clock cannot be changed.

For 6670 ref clock is 250Mhz. So for SRIO rate of 5GBps, PLL setting is 

    CSL_BootCfgSetSRIOSERDESConfigPLL (0x251);

My reference is : MCSDK package file name :

\pdk_C6670_1_1_0_0\packages\ti\transport\ipc\examples\srioIpcBenchmark\device_srio.c

FYI :

New MCSDK , version 2.0.5 is out. It maybe a good idea to download and use this.

http://software-dl.ti.com/sdoemb/sdoemb_public_sw/bios_mcsdk/latest/index_FDS.html

Hope this helps.

Hi,

Can you please help us for the below queries ?

I gone through the C6670 SRIO User guide and Example program " MulticoreLoopbackExample Project" .

I have read in the user guide that we can control how Hardware segments the packet . (i.e) 8 Bytes to 256 Bytes. I hope it means that SRIO driver is capable segment the packet that that will be sent out.

However I do not find any information in the example code or user guide about this segmentation information fields. Instead I saw the SRIO_MAX_MTU which was set as 256 Bytes in  ex program. This information was passed in CPPI Rx config , CPPI Tx config.

Can you please tell us where to pass segment info in order to make driver to do the packet segmentation ?

Thanks & Regards

Rajkumar