Changeset 611

Show
Ignore:
Timestamp:
10/28/99 02:20:17 (9 years ago)
Author:
mds
Message:

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

All reports of hangs have been on ASUS P5A boards.

Files:

Legend:

Unmodified
Added
Removed
Modified
Copied
Moved

  • lm-sensors/trunk/doc/busses/i2c-ali15x3

    r542 r611  
    66Supported adapters: 
    77  * Acer Labs, Inc. ALI 1533 and 1543C 
    8     Datasheet: Publicly available at the Acer Labs website 
     8    Datasheet: Available at the Acer Labs website (password required) 
    99 
    1010Author: Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock 
    …… 
    2424Stability 
    2525--------- 
    26 Complete and tested on the author's system. 
    27 Untested by others. 
    28 SMBus sometimes hangs on author's system when accessing W83781D, 
    29 cause unknown (see Issues below). 
     26Complete and tested. 
     27SMBus periodically hangs on ASUS P5A motherboards and can only be 
     28cleared by a power cycle. Cause unknown (see Issues below). 
     29Block reads/writes untested (not used by any existing sensor driver). 
    3030 
    3131 
    …… 
    105105To fix this, undefine MAP_ACPI. 
    106106 
    107 On the author's ASUS P5A, the W83781D chip is on both the 
    108 ISA and the SMBus. 
    109  
    110 On the author's ASUS P5A, the W83781D chip hangs the whole 
    111 bus and this can only be resolved by powering off the computer. 
    112 The chip does not hang if an external device is attached 
    113 to the SMBus. There may be electrical problems on this board. 
    114 The EEPROM on the DRAM DIMM is accessible on the SMBus and 
    115 it does not hang the bus. 
    116  
    117  
    118 External Device Connection for ASUS P5A 
    119 --------------------------------------- 
    120 On the author's ASUS P5A board, 
    121 the SMBus connector is between the 4th and 5th PCI 
    122 connector. The pinouts are: 
    123         1. Clock 
    124         2. no pin 
    125         3. Ground 
    126         4. Data 
    127         5. +5V 
     107On the ASUS P5A motherboard, there are several reports that 
     108the SMBus will hang 
     109and this can only be resolved by powering off the computer. 
     110There may be electrical problems on this board. 
     111On the P5A, the W83781D sensor chip is on both the ISA and 
     112SMBus. Therefore the SMBus hangs can generally be avoided 
     113by accessing the W83781D on the ISA bus only.