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Message-ID: <874j0kvqs3.fsf@miraculix.mork.no>
Date: Sun, 23 Feb 2025 12:34:04 +0100
From: Bjørn Mork <bjorn@...k.no>
To: netdev@...r.kernel.org
Subject: Phy access methods for copper SFP+ disguised as SR
Got myself a couple of cheap 10GBase-T SFP+s and am struggling to figure
out how to talk to the phy. The phy does not appear to be directly
accessible on 0x56, and it does not respond using the Rollball protocol
either.
Are there any other well known methods out there, or am I stuck with
whatever SR emulation the SFP vendor implemented?
This is all it shows, and 0x56 just reads zeroes no matter what I do:
root@...8cl:~# i2cdetect -y 8
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 -- -- -- -- 56 -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
root@...8cl:~# i2cdump -y 8 0x50
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 03 04 07 10 00 00 00 00 00 00 00 06 67 00 00 00 ????.......?g...
10: 08 02 00 1e 4f 45 4d 20 20 20 20 20 20 20 20 20 ??.?OEM
20: 20 20 20 20 00 00 00 00 53 46 50 2d 31 30 47 2d ....SFP-10G-
30: 54 38 20 20 20 20 20 20 41 20 20 20 00 00 00 0c T8 A ...?
40: 00 1a 00 00 46 32 35 30 31 31 34 54 30 30 31 30 .?..F250114T0010
50: 20 20 20 20 32 35 30 31 31 35 20 20 68 f0 03 eb 250115 h???
60: 00 00 11 6b e0 e7 c2 e1 ff ff 18 79 21 c8 24 ed ..?k????..?y!?$?
70: d8 45 85 00 00 00 00 00 00 00 00 00 1c 24 98 22 ?E?.........?$?"
80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ................
root@...8cl:~# i2cdump -y 8 0x51
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 50 00 f6 00 4b 00 fb 00 8c 9f 71 48 88 b8 75 30 P.?.K.?.??qH??u0
10: 1d 4c 01 f4 19 64 03 e8 2b d4 07 46 27 10 09 28 ?L???d??+??F'??(
20: 2b d4 02 85 27 10 03 2c 00 00 00 00 00 00 00 00 +???'??,........
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
40: 00 00 00 00 3f 80 00 00 00 00 00 00 01 00 00 00 ....??......?...
50: 01 00 00 00 01 00 00 00 01 00 00 00 00 00 00 7e ?...?...?......~
60: 42 33 7f ca 0b b8 13 92 13 92 00 00 00 00 00 00 B3????????......
70: 00 00 00 00 00 00 00 00 00 00 40 00 00 00 00 00 ..........@.....
80: 43 4f 55 49 41 38 4e 43 41 41 31 30 2d 32 34 31 COUIA8NCAA10-241
90: 35 2d 30 33 56 30 33 20 01 00 46 00 00 00 00 c6 5-03V03 ?.F....?
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 aa aa ..............??
c0: 53 46 50 2d 31 30 47 2d 53 52 20 20 20 20 20 20 SFP-10G-SR
d0: 20 20 20 20 33 32 00 00 00 00 00 00 00 00 00 35 32.........5
e0: 1e 28 2e 2e 31 34 29 36 00 00 00 00 00 00 00 00 ?(..14)6........
f0: 00 00 00 00 00 66 00 00 ff ff ff ff ff ff 29 e3 .....f........)?
root@...8cl:~# i2cdump -y 8 0x56
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Bjørn
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