mirror of
https://github.com/lm-sensors/lm-sensors.git
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Frodo Looijaard
0127fb5ec6
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@413 7894878c-1315-0410-8ee3-d5d059ff63e0
127 lines
3.7 KiB
Plaintext
127 lines
3.7 KiB
Plaintext
Kernel driver `i2c-ali5x3.o'
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Status: Complete and tested
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Supported adapters:
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* Acer Labs, Inc. ALI 1533 and 1543C
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Datasheet: Publicly available at the Acer Labs website
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Author: Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock
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<phil@netroedge.com>, and Mark D. Studebaker <mds@eng.paradyne.com>
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Module Parameters
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-----------------
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(none)
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Description
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-----------
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Stability
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---------
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Complete and tested on the author's system.
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Untested by others.
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SMBus sometimes hangs on author's system when accessing W83781D,
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cause unknown (see Issues below).
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Supported Devices
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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
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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 have to upgrade your BIOS.
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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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So we have to make sure that both the SMB and the ACPI
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are mapped and enabled.
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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 both for the SMB and the ACPI
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registers, just to be safe. It doesn't actually use the ACPI region.
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It will therefore conflict with separate software
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that accesses the ACPI registers?
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To fix this, undefine MAP_ACPI.
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On the author's ASUS P5A, the W83781D chip is on both the
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ISA and the SMBus.
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On the author's ASUS P5A, the W83781D chip hangs the whole
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bus and this can only be resolved by powering off the computer.
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The chip does not hang if an external device is attached
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to the SMBus. There may be electrical problems on this board.
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The EEPROM on the DRAM DIMM is accessible on the SMBus and
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it does not hang the bus.
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External Device Connection for ASUS P5A
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---------------------------------------
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On the author's ASUS P5A board,
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the SMBus connector is between the 4th and 5th PCI
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connector. The pinouts are:
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1. Clock
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2. no pin
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3. Ground
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4. Data
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5. +5V
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