VIA EPIA SPD

[ron minnich]

I'm getting a bad feeling about SPD on EPIA.

I have tried to scan SPD on both a normal bios and linuxbios, and I don't 
get any real data back. The SMBUS hardware all acts correctly, but on 
linuxbios every SPD byte reads back as 0, and on the normal bios every spd 
byte reads back as 3.

now, on earlier VIA platforms I have had, SPD has only been connected to
one slot, not all slots. I have some concern that SPD is not wired at all 
on EPIA. VIA had expressed concern to me about the many errors in low-end 
SEEROMs used on DRAM, and felt that SPD was not always a good way to go.

Can anyone out there confirm or deny my speculation on SPD on EPIA?

SPD scan code available on request.

ron

[SONE Takeshi]

Thanks a lot for your work on EPIA.

On Tue, Sep 30, 2003 at 10:30:45AM -0600, ron minnich wrote:
> I'm getting a bad feeling about SPD on EPIA.
>
> I have tried to scan SPD on both a normal bios and linuxbios, and I don't 
> get any real data back. The SMBUS hardware all acts correctly, but on 
> linuxbios every SPD byte reads back as 0, and on the normal bios every spd 
> byte reads back as 3.
>
> now, on earlier VIA platforms I have had, SPD has only been connected to
> one slot, not all slots. I have some concern that SPD is not wired at all 
> on EPIA. VIA had expressed concern to me about the many errors in low-end 
> SEEROMs used on DRAM, and felt that SPD was not always a good way to go.
>
> Can anyone out there confirm or deny my speculation on SPD on EPIA?

Looks like lm-sensors can read SPD on EPIA.

black:~$ ls /proc/sys/dev/sensors/eeprom-i2c-1-50/ 
00  10  20  30  40  50  60  70  80  90  a0  b0  c0  d0  e0  f0
black:~$ cat /proc/sys/dev/sensors/eeprom-i2c-1-50/*
128 8 4 13 10 1 64 0 1 117 84 0 130 8 0 1
143 4 6 1 1 0 14 117 84 0 0 15 15 15 37 64
21 8 21 8 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 18 137
0 0 0 0 0 0 0 0 0 51 50 77 88 54 52 85
45 49 51 51 0 51 50 77 88 56 0 0 0 0 0 2
9 17 194 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 100 246
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

I think it uses i2c-viapro I2C driver to talk to the EEPROM.

black:~$ lsmod
Module                  Size  Used by    Not tainted
i2c-viapro              3728   0 (unused)
eeprom                  3508   0
snd                    24168   0
soundcore               3108   0 [snd]
fbcon-cfb32             3648   0 (unused)
fbcon-cfb24             4128   0 (unused)
fbcon-cfb16             3872   0 (unused)
fbcon-cfb8              3264   0 (unused)
fbgen                   2740   0 (unused)
vt8231                  6884   0 (unused)
i2c-proc                6928   0 [eeprom vt8231]
i2c-isa                 1096   0 (unused)
i2c-core               13928   0 [i2c-viapro eeprom vt8231 i2c-proc
i2c-isa]
via-rhine              12936   1
mii                     2160   0 [via-rhine]
rtc                     5916   0 (autoclean)
black:~$

[ron minnich]

anybody want to send me that code and see what might be working right in 
it?

thanks

ron