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https://github.com/lm-sensors/lm-sensors.git
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Jean Delvare
04aaf78d3a
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@1584 7894878c-1315-0410-8ee3-d5d059ff63e0
136 lines
4.4 KiB
Plaintext
136 lines
4.4 KiB
Plaintext
Kernel driver `i2c-ali15x3.o'
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Status: Complete and tested; block reads/writes untested (not used by any
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current chip driver)
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Supported adapters:
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* Acer Labs, Inc. ALI 1533 and 1543C (south bridge)
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Datasheet: Available at the Acer Labs website (password required)
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Author: Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock
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<phil@netroedge.com>, and Mark D. Studebaker <mdsxyz123@yahoo.com>
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License: GPL
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Module Parameters
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-----------------
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* force_addr: int
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Initialize the base address of the i2c controller
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Notes
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-----
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The force_addr parameter is useful for boards that don't set the address
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in the BIOS. Does not do a PCI force; the device must still be present
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in lspci. Don't use this unless the driver complains that the
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base address is not set.
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Example: 'modprobe i2c-ali15x3 force_addr=0xe800'
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SMBus periodically hangs on ASUS P5A motherboards and can only be
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cleared by a power cycle. Cause unknown (see Issues below).
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Description
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-----------
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This is the driver for the SMB Host controller on
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Acer Labs Inc. (ALI) M1541 and M1543C South Bridges.
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The M1543C is a South bridge for desktop systems.
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The M1541 is a South bridge for portable systems.
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They are part of the following ALI chipsets:
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"Aladdin Pro 2": Includes the M1621 Slot 1 North bridge
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with AGP and 100MHz CPU Front Side bus
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"Aladdin V": Includes the M1541 Socket 7 North bridge
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with AGP and 100MHz CPU Front Side bus
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Some Aladdin V motherboards:
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Asus P5A
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Atrend ATC-5220
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BCM/GVC VP1541
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Biostar M5ALA
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Gigabyte GA-5AX (** Generally doesn't work because the BIOS doesn't
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enable the 7101 device! **)
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Iwill XA100 Plus
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Micronics C200
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Microstar (MSI) MS-5169
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"Aladdin IV": Includes the M1541 Socket 7 North bridge
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with host bus up to 83.3 MHz.
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For an overview of these chips see http://www.acerlabs.com
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At this time the full data sheets on the web site are password protected,
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however if you contact the ALI office in San Jose
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they may give you the password.
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The M1533/M1543C devices appear as FOUR separate devices
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on the PCI bus. An output of lspci will show something similar
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to the following:
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00:02.0 USB Controller: Acer Laboratories Inc. M5237 (rev 03)
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00:03.0 Bridge: Acer Laboratories Inc. M7101 <= THIS IS THE ONE WE NEED
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00:07.0 ISA bridge: Acer Laboratories Inc. M1533 (rev c3)
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00:0f.0 IDE interface: Acer Laboratories Inc. M5229 (rev c1)
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** IMPORTANT **
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** If you have a 1533 or 1543C on the board and you get
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** "ali15x3.o: Error: Can't detect ali15x3!"
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** then run lspci.
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** If you see the 1533 and 5229 devices but NOT the 7101 device,
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** then you must enable ACPI, the PMU, SMB, or something similar
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** in the BIOS. If you can't figure out how to enable the
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** 7101 device in the BIOS, you can try one of the "hotplug" modules -
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** see below.
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** The driver won't work if it can't find the 7101 device.
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The SMB controller is part of the 7101 device, which is an
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ACPI-compliant Power Management Unit (PMU).
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The whole 7101 device has to be enabled for the SMB to work.
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You can't just enable the SMB alone.
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The SMB and the ACPI have separate I/O spaces.
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We make sure that the SMB is enabled. We leave the ACPI alone.
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Features
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--------
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This driver controls the SMB Host only.
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The SMB Slave controller on the M15X3 is not enabled.
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This driver does not use interrupts.
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Issues
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------
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This driver requests the I/O space for only the SMB
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registers. It doesn't use the ACPI region.
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On the ASUS P5A motherboard, there are several reports that
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the SMBus will hang and this can only be resolved by
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powering off the computer. It appears to be worse when the board
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gets hot, for example under heavy CPU load, or in the summer.
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There may be electrical problems on this board.
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On the P5A, the W83781D sensor chip is on both the ISA and
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SMBus. Therefore the SMBus hangs can generally be avoided
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by accessing the W83781D on the ISA bus only.
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Hot Plug Modules
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----------------
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There are EXPERIMENTAL "hotplug" modules which will enable the
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m7101 device if it is not enabled on your motherboard.
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Use these at your own risk. Read the README file carefully.
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m7101 Version 0.1 for 2.2 and early 2.3 kernels:
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README: http://www.netroedge.com/~lm78/misc/README-m7101.txt
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source and README: http://www.netroedge.com/~lm78/misc/m7101-0.1.tar.gz
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m7101 Version 0.2 for 2.4 and later 2.3 kernels:
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In the directory prog/hotplug in this package.
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Must be built separately.
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