On 29 Jan 2014, at 11:55, Jean Delvare <khali@xxxxxxxxxxxx> wrote: > On Wed, 29 Jan 2014 11:48:47 -0800, Alun Evans wrote: >>>> This is a big board with many DDR3 slots. >> >> Heh, this is a 8-DIMM board. We’ve just ordered a 24-DIMM board, with an eye to a 48-DIMM board. > > Right, 8 DIMMs would normally not require multiplexing. But vendors > like to reuse designs and your 8-DIMM board is probably a "small" > version of something bigger. My Asus Z8NA-D6 has only 6 DIMMs but it > has an I2C multiplexer anyway. Ah, that is likely with an SM board certainly. > >>> (...) >>> I would suspect it is GPIO; the i2c muxes are typically at address 0x7x >>> which is empty in above i2cdetect log. The DSDT might give a hint if we >>> are really lucky. Not that I am any good in decoding DSDTs, though ;-). >> >> I followed : https://01.org/linux-acpi/utilities >> >> And there is this hunk: >> >> OperationRegion (GPIO, SystemIO, GPBS, 0x20) >> Field (GPIO, DWordAcc, NoLock, Preserve) >> { >> Offset (0x0C), >> GLVL, 32, >> Offset (0x18), >> GBLK, 32 >> } > > And can you tell us what GPBS is? > Looks like it’s GPIOBASE. I’ve never looked at ACPI/DSDT, so I’ve not clue what I’m doing here. I could send the entire del file, but I don’t want to trouble anyone unnecessarily. A. -- Alun Evans
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