On Tue, Jan 13, 2004 at 04:14:10PM -0800, Julian Elischer wrote: > > > On Wed, 14 Jan 2004, Stijn Hoop wrote: > > > On Tue, Jan 13, 2004 at 03:26:00PM -0800, Julian Elischer wrote: > > > The kernel includes teh ichsmb driver to try access the SMBus > > > for temperature reading reasons (yes I know I can do it other ways..) > > > > > > Any thoughts that move me towards getting th eichsmb driver working on > > > this machine are welcome. > > > > Make sure that the mainboard really does support SMBus -- it turns out that > > this is optional. The ICH docs talk about a bit that should be enabled in the > > PCI config when SMB is present. I ran into this once, it should be documented > > in the archives (of -current off the top of my head). OTOH, I didn't even > > succeed in getting an ichsmb device probed so this might be something totally > > unrelated.
SMBus is absolutely not optional because it's required for SPD eeproms. > > FWIW, I had to try other ways to get the temperature (xmbmon & related). I > > don't have the box anymore or I'd show you the exact config... > > xmbmon uses the SMBus to read the temperatures but it does it from > userland using direct read and write operations > and when there are timing glitches caused by the process not getting > scheduled quite quick enough you get garbage results.. > teh theory is that the kernel driver wouldn't be susceptible to this > but it looks like unless I resort to polling I will not be able to use > it because it relies on the interrupts and they are not being delivered. ichsmb(4) does a different addressing on smbus as other smbus drivers. I'm about to validate all SMBus drivers to harmonise this point. Also software regulary forgets about different smb.h include path on 5.x > ASUS motherboards actually turn off the SMBus. (why?) A very good question - I'm in tight contact with Asus germany to get that answered, but even they doesn't seem to get a satisfying answer from taiwan. It seems that they don't want customers to tamper with SMBus :( > So you need to turn it back on before you can read the temperatures.. Use ACPI... Well - it's evil after all, because I sell add on products for SMBus for which ACPI is not an option. -- B.Walter BWCT http://www.bwct.de [EMAIL PROTECTED] [EMAIL PROTECTED] _______________________________________________ [EMAIL PROTECTED] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[EMAIL PROTECTED]"
