We're using 82576 on a main board(ARM with PCIe x1) using 3.0.x kernel. I
can probe the device at the moment.
I'm connecting the 82576 to a SFP which has an I2C for the external
PHY(RJ45), I also have EEPROM and SPI-Flash connected via SPI to 82576
based on Intel's reference schematics.
I have a list of questions:
1. We're using SerDes to connect with the SFP, it's unclear to me per the
Datasheet that, should we use SGMII instead? what's the key difference
here? We're using RJ45/SFP but we may need use fiber/SFP later, which is
the reason we're not using the internal PHY. I saw there are some code for
SFP inside the igb driver.
2. On the EEPROM, do we have to use it? I think igb is getting deviceID
from the EEPROM, as 'lspci -v' showed 10c9:0000 now, the EEPROM is blank at
the moment, and I modified the code to bypass the MAC-address-reading from
EEPROM(providing some fake MACs for now) so I can run 'ifconfig eth0 up'
against it though I can never send out packets.
2.1 Is it possible at all the get this working without using EEPROM?
3. How to program the blank EEPROM, can I use ethtool do that? or do I have
to take it out and program it before solder it down?
4. When do I need SPI-Flash? do I need it at all? The datasheet says it can
hold some firmware but I'm not sure what it means.
5. From e1000_hw.h, 0x10C9 is for 82576 itself, the rest is for the
specific products, but what's the difference between Fiber, Serdes, copper?
In my case I use SFP/RJ45, is it more like Serdes or Copper or even
RGMII(there is aE1000_DEV_ID_I350_SGMII) , very confused.
#define E1000_DEV_ID_82576 0x10C9
#define E1000_DEV_ID_82576_FIBER 0x10E6
#define E1000_DEV_ID_82576_SERDES 0x10E7
#define E1000_DEV_ID_82576_QUAD_COPPER 0x10E8
#define E1000_DEV_ID_82576_QUAD_COPPER_ET2 0x1526
#define E1000_DEV_ID_82576_SERDES_QUAD 0x150D
6. I don't see MACSEC code in the driver, is it implemented at Intel but
just not open sourced? The Intel representative is unclear on that either.
Basically I need confirm SerDes or RGMII for SFP, then learn how to modify
the driver and program EEPROM to get 82576 working on the custom design.
Any tips/suggestions are great appreciated!
Thanks a lot.
Joe
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