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-Kernel driver i2c-ali15x3
-Supported adapters:
- * Acer Labs, Inc. ALI 1533 and 1543C (south bridge)
- Datasheet: Now under NDA
- Frodo Looijaard <>,
- Philip Edelbrock <>,
- Mark D. Studebaker <>
-Module Parameters
-* force_addr: int
- Initialize the base address of the i2c controller
-The force_addr parameter is useful for boards that don't set the address in
-the BIOS. Does not do a PCI force; the device must still be present in
-lspci. Don't use this unless the driver complains that the base address is
-not set.
-Example: 'modprobe i2c-ali15x3 force_addr=0xe800'
-SMBus periodically hangs on ASUS P5A motherboards and can only be cleared
-by a power cycle. Cause unknown (see Issues below).
-This is the driver for the SMB Host controller on Acer Labs Inc. (ALI)
-M1541 and M1543C South Bridges.
-The M1543C is a South bridge for desktop systems.
-The M1541 is a South bridge for portable systems.
-They are part of the following ALI chipsets:
- * "Aladdin Pro 2" includes the M1621 Slot 1 North bridge with AGP and
- 100MHz CPU Front Side bus
- * "Aladdin V" includes the M1541 Socket 7 North bridge with AGP and 100MHz
- CPU Front Side bus
- Some Aladdin V motherboards:
- Asus P5A
- Atrend ATC-5220
- BCM/GVC VP1541
- Biostar M5ALA
- Gigabyte GA-5AX (** Generally doesn't work because the BIOS doesn't
- enable the 7101 device! **)
- Iwill XA100 Plus
- Micronics C200
- Microstar (MSI) MS-5169
- * "Aladdin IV" includes the M1541 Socket 7 North bridge
- with host bus up to 83.3 MHz.
-For an overview of these chips see At this time the
-full data sheets on the web site are password protected, however if you
-contact the ALI office in San Jose they may give you the password.
-The M1533/M1543C devices appear as FOUR separate devices on the PCI bus. An
-output of lspci will show something similar to the following:
- 00:02.0 USB Controller: Acer Laboratories Inc. M5237 (rev 03)
- 00:03.0 Bridge: Acer Laboratories Inc. M7101 <= THIS IS THE ONE WE NEED
- 00:07.0 ISA bridge: Acer Laboratories Inc. M1533 (rev c3)
- 00:0f.0 IDE interface: Acer Laboratories Inc. M5229 (rev c1)
-** If you have a M1533 or M1543C on the board and you get
-** "ali15x3: Error: Can't detect ali15x3!"
-** then run lspci.
-** If you see the 1533 and 5229 devices but NOT the 7101 device,
-** then you must enable ACPI, the PMU, SMB, or something similar
-** in the BIOS.
-** The driver won't work if it can't find the M7101 device.
-The SMB controller is part of the M7101 device, which is an ACPI-compliant
-Power Management Unit (PMU).
-The whole M7101 device has to be enabled for the SMB to work. You can't
-just enable the SMB alone. The SMB and the ACPI have separate I/O spaces.
-We make sure that the SMB is enabled. We leave the ACPI alone.
-This driver controls the SMB Host only. The SMB Slave
-controller on the M15X3 is not enabled. This driver does not use
-This driver requests the I/O space for only the SMB
-registers. It doesn't use the ACPI region.
-On the ASUS P5A motherboard, there are several reports that
-the SMBus will hang and this can only be resolved by
-powering off the computer. It appears to be worse when the board
-gets hot, for example under heavy CPU load, or in the summer.
-There may be electrical problems on this board.
-On the P5A, the W83781D sensor chip is on both the ISA and
-SMBus. Therefore the SMBus hangs can generally be avoided
-by accessing the W83781D on the ISA bus only.