On Fri, Apr 12, 2019 at 7:52 PM Jean Delvare <jdelvare@xxxxxxx> wrote:
>
> On Fri, 12 Apr 2019 19:15:54 +0100, Dreamcat4 wrote:
> > On Fri, Apr 12, 2019 at 3:43 PM Jean Delvare <jdelvare@xxxxxxx> wrote:
> > > OK, so the problem is that the EEPROMs on your memory modules do not
> > > behave the way the ee1004 driver expects. I thought EE1004 was a
> > > standard for all DDR4 modules... I have no satisfactory explanation for
> > > what you observe. Either Crucial used non-standard SPD EEPROMs, or the
> > > SMBus controller is messing up with the commands before they reach the
> > > EEPROMs. But both are pretty unlikely.
> > >
> > > Out of curiosity, what's your SMBus controller?
> > >
> > > # lspci -nn | grep SMBus
> >
> > [root:~] 6 # lspci -nn | grep SMBus
> > 00:1f.4 SMBus [0c05]: Intel Corporation 200 Series/Z370 Chipset Family
> > SMBus Controller [8086:a2a3]
> > [root:~] #
>
> OK, can you please try the following and report which commands fail and
> which succeed (if any):
>
> # rmmod ee1004
> # modprobe i2c-dev
> # i2cset 2 0x36 0x00
> # i2cget 2 0x36 0x00
[root:~] # rmmod ee1004
[root:~] # modprobe i2c-dev
[root:~] # i2cset 2 0x36 0x00
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will write to device file /dev/i2c-2, chip address 0x36, data address
0x00, no data.
Continue? [Y/n] y
Error: Write failed
[root:~] 1 # i2cget 2 0x36 0x00
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will read from device file /dev/i2c-2, chip address 0x36, data address
0x00, using read byte data.
Continue? [Y/n] y
Error: Read failed
[root:~] 2 #
no messages on dmesg
>
> Please also provide the full PCI configuration space for the SMBus
> controller:
>
> # lspci -vvv -s 00:1f.4
[root:~] # lspci -vvv -s 00:1f.4
00:1f.4 SMBus: Intel Corporation 200 Series/Z370 Chipset Family SMBus Controller
Subsystem: ASUSTeK Computer Inc. 200 Series PCH SMBus Controller
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop-
ParErr- Stepping- SERR- FastB2B- DisINTx-
Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR- INTx-
Interrupt: pin A routed to IRQ 16
Region 0: Memory at df24a000 (64-bit, non-prefetchable) [size=256]
Region 4: I/O ports at f000 [size=32]
Kernel driver in use: i801_smbus
Kernel modules: i2c_i801
[root:~] #
>
> Thanks,
> --
> Jean Delvare
> SUSE L3 Support
