Linux/DRA744: RGMII-ID ( Internal delay) setting....

shawn lin

Genius 3450 points

Part Number: DRA744
Other Parts Discussed in Thread: TDA2

Tool/software: Linux

Hi ,

I use the RGMII interface connect with Marvell Ethernet SW (88E6390).

I set RGMII delay setting enable ( rgmii-id ) but it seems not work.

Below is my device setting...

&cpsw_emac0 {
phy_id = <&davinci_mdio>, <0>;
phy-mode = "rgmii-id";
dual_emac_res_vlan = <1>;
fixed-link = <1 1000 0 0>;
};

How to ensure the RGMII-ID enable setting is correct?

over 8 years ago

0 Yordan Kamenov over 8 years ago

TI__Mastermind 42515 points

Hi Shawn,

which is the version of your SDK/Linux kernel?

Regards,
Yordan

0 shawn lin over 8 years ago in reply to Yordan Kamenov

Genius 3450 points

GLSDK 7.04.03.
Linux dra7xx-evm 3.14.63

0 Yordan Kamenov over 8 years ago in reply to shawn lin

TI__Mastermind 42515 points

Hi Shawn,

I have forwarded your question to an ethernet expert.

Regards,
Yordan

0 Prasad Jondhale over 8 years ago in reply to Yordan Kamenov

TI__Mastermind 27743 points

Shawn,

Till Linux Ethernet expert helps you, can you please refer to http://www.ti.com/lit/an/snla243/snla243.pdf for RGMII delay settings?

0 shawn lin over 8 years ago in reply to Prasad Jondhale

Genius 3450 points

I find the RGMII features that only SR2.0 can enable or disable internal TXC delay.

and I got the Chip Revision by dev2mem command

0x1B99002F --> SR 1.1

Is that mean i can not use RGMII-ID setting????

0 Prasad Jondhale over 8 years ago in reply to shawn lin

TI__Mastermind 27743 points

The RGMII-ID is not supported on SR1.1. The internal TXC delays are always enabled on this and remote side/PHY needs to take care of not reapplying the delay for Rx lines as TDA2 has already applied it.

0 shawn lin over 8 years ago in reply to Prasad Jondhale

Genius 3450 points

TXC delay is always enable..but it still have no delay on by board

Below image is J6 RGMII TXC and TXD0 and do not connect anything.

0 Prasad Jondhale over 8 years ago in reply to shawn lin

TI__Mastermind 27743 points

Could you check DRA7x Ethernet statistics registers? Is there any error bits set?

Also check on PHY side too if any align/CRC issues.

Processors

Processors forum

Linux/DRA744: RGMII-ID ( Internal delay) setting....