Realtek RTL8102E registers

Realtek RTL8102E registers

[Ivan Frederiks]

Hello!

I met troubles with RTL8102E operation (you can find detailed
description below). I suppose that those troubles are related to chip
misconfiguration. Maybe you have access to RTL8102E register
description? If yes, would you be so kind to share it with me?

Thank you in advance,

Ivan Frederiks
Embedded developer
Speech Technology Center

Phone: +7-812-331-0665, ext. 6123, 6942
Fax: +7-812-327-9297

P.S.

Issue description:
I'm currently working with a custom motherboard equipped with 2 RTL8102E
ICs and an Intel x86 SOM. SOM runs 32-bit Linux (Arch or Ubuntu).
By default I use r8169 driver. I know that Ethernet link is up (I
checked it with an oscilloscope and I see that RTL8102E link LEDs are
on). In most cases everything works fine. But sometimes driver reports
that link is down. After a power cycle driver reports, that link is up.
When I replace driver with r8101, it always reports that link is up, but
I observe other issues.

Re: Realtek RTL8102E registers

[Francois Romieu]

Ivan Frederiks <frederiks@speechpro.com> :
[...]
> Maybe you have access to RTL8102E register description ?

No.

Realtek's hardware documentation policy isn't exactly opened. Your hardware
vendor may help.

[...]
> Issue description:
[snip]

kernel version and r81xx XID value as it should appear in dmesg would
be welcome.

-- 
Ueimor

Re: Realtek RTL8102E registers

[Ivan Frederiks]

Hello Francois,

I found solution for the issue that I described earlier: one has to set
correct MAC-address before bringing up the interface.

On my board RTL8102E works without EEPROM, so initial MAC-address value
is unpredictable. In many cases this value has multicast bit set to 1.
This fact breaks driver and (or) TCP stack operation:
* r8169 reports that link is down
* r8101 reports that link is OK, but Linux TCP stack ignores packets
with multicast destination MAC

Hope this info would be useful. BTW, I suppose that driver could have
some kind of protection against such situations.

On 30.10.2013 01:40, Francois Romieu wrote:
> Ivan Frederiks <frederiks@speechpro.com> :
> [...]
>> Maybe you have access to RTL8102E register description ?
> 
> No.
> 
> Realtek's hardware documentation policy isn't exactly opened. Your hardware
> vendor may help.
> 
> [...]
>> Issue description:
> [snip]
> 
> kernel version and r81xx XID value as it should appear in dmesg would
> be welcome.
> 

--
Best regards,

Ivan Frederiks
Embedded developer
Speech Technology Center

Phone: +7-812-331-0665, ext. 6123, 6942
Fax: +7-812-327-9297