2002-02-27 02:47:04 +00:00
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What is it?
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-----------
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2005-04-15 16:54:22 +00:00
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NOTE:
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This module is for 2.4 kernels only. For 2.6 kernels,
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activation is handled by the code in drivers/pci/quirks.c
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in the kernel source. If you have the latest 2.6 kernel and
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the quirks code does not activate your SMBus, try adding support
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in quirks.c, recompile and test your new kernel, and then
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submit a patch to us. Contact us if you need assistance.
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2002-02-27 02:47:04 +00:00
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This is just a quick and dirty hack to get the hardware monitoring working
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on the ASUS P4B board under Linux.
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2002-05-24 02:36:36 +00:00
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It works by turning on the SMBus PCI device.
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It is implemented as a module, p4b_smbus.o.
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2002-06-28 02:49:46 +00:00
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It only works with the ICH2 (82801BA) and ICH4 (82801DB).
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2002-05-24 02:36:36 +00:00
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2002-06-28 02:49:46 +00:00
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ASUS switches off the SMBus PCI Device
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in the i801 ICH2/4 chip. I spoke two times
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2002-05-24 02:36:36 +00:00
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with the German support and learned that: "We do not want the users to be
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2002-02-27 02:47:04 +00:00
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irritated by just another PCI Device in the Win98 device manager."
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Really funny :-).
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2003-12-07 23:25:28 +00:00
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NOTE: We have a report that as of kernel 2.4.23, the kernel activates
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the SMBus PCI device, so that this module is not required.
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2002-02-27 02:47:04 +00:00
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What does the module do?
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------------------------
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2002-06-28 02:49:46 +00:00
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(Note: the following instructions assume the ICH2. For the ICH4,
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the PCI IDs are 24C0 and 24C3)
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2002-02-27 02:47:04 +00:00
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It turnes off (!) the bits number 8 and 3 in the LPC register of the ICH2.
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This you can also try as root with setpci and pcitweak.
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First do a:
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setpci -d 8086:2440 f2.w
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You will get an hex number VAL - in my case 148 (Hex)-, where you have to
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erase the two bits - in my case you get 40 (Hex).
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Then do a:
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setpci -d 8086:2440 f2.w=VAL
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Running "lspci -n" you will not see any new device, but with "pcitweak -l" you
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should get a line similar to this in the output:
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PCI: 00:1f:3: chip 8086,2443 card 1043,8028 rev 12 class 0c,05,00 hdr 00
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The important thing is the "8086,2443" here.
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The device is activated, but not included in /proc/pci and
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/proc/bus/pci/devices. This is the reason for running the module.
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What are the system requirements?
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---------------------------------
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2002-06-28 02:49:46 +00:00
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- Obviously a board with Intel i801BA/DB ICH2/4 with broken bios.
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2002-02-27 02:47:04 +00:00
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- A linux working with a 2.4 kernel AND hotplug support in it!
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- A installed kernel tree and gcc.
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- i2c and sensor modules installed.
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How to install?
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---------------
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Simply do a:
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make -f Makefile.p4b
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insmod p4b_smbus.o
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modprobe i2c-core
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modprobe i2c-i801
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modprobe i2c-dev
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modprobe i2c-proc
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Then run your sensor:
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modprobe w83781d
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What should i never do?
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-----------------------
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Do not try to do a "rmmod p4b_smbus" before a "rmmod i2c-i801".
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The other way around should be okay. Otherwise you remove the PCI device
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without notifying the i2c driver.
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-------------------------------
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Ilja Rauhut <IljaRauhut@web.de>
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