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(mds) doc update. Clarify description of problems with SMBus hangs on ASUS P5A motherboards.

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All reports of hangs have been on ASUS P5A boards.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@611 7894878c-1315-0410-8ee3-d5d059ff63e0
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Mark D. Studebaker committed 1999-10-28 00:20:17 +00:00
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doc/busses/i2c-ali15x3
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@@ -5,7 +5,7 @@ Status: Complete and tested.
Supported adapters:
* Acer Labs, Inc. ALI 1533 and 1543C
Datasheet: Publicly available at the Acer Labs website
Datasheet: Available at the Acer Labs website (password required)
Author: Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock
<phil@netroedge.com>, and Mark D. Studebaker <mds@eng.paradyne.com>
@@ -23,10 +23,10 @@ Description
Stability
---------
Complete and tested on the author's system.
Untested by others.
SMBus sometimes hangs on author's system when accessing W83781D,
cause unknown (see Issues below).
Complete and tested.
SMBus periodically hangs on ASUS P5A motherboards and can only be
cleared by a power cycle. Cause unknown (see Issues below).
Block reads/writes untested (not used by any existing sensor driver).
Supported Devices
@@ -104,24 +104,10 @@ It will therefore conflict with separate software
that accesses the ACPI registers?
To fix this, undefine MAP_ACPI.
On the author's ASUS P5A, the W83781D chip is on both the
ISA and the SMBus.
On the author's ASUS P5A, the W83781D chip hangs the whole
bus and this can only be resolved by powering off the computer.
The chip does not hang if an external device is attached
to the SMBus. There may be electrical problems on this board.
The EEPROM on the DRAM DIMM is accessible on the SMBus and
it does not hang the bus.
External Device Connection for ASUS P5A
---------------------------------------
On the author's ASUS P5A board,
the SMBus connector is between the 4th and 5th PCI
connector. The pinouts are:
1. Clock
2. no pin
3. Ground
4. Data
5. +5V
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.
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.