1. VIA4in1428.zip Driver
2. VIA IDE HDD UDMA Driver Supplement.txt File Contents

VIA IDE HDD UDMA Driver Supplement.txt Driver File Contents (VIA4in1428.zip)

            VIA WCE X86 IDE HDD UDMA Driver Supplement
                            11/29/2000
             Copyright (C) 2000 VIA Technologies, INC.

1. Overview
This report lists additional supported south bridge chips since
the last driver release, and describes an extra registry subkey
for VIA's IDE UDMA driver for Windows CE. This subkey alters the
way the driver detects the on-board IDE ATA devices and avoids the
system from crashing when an IDE ATAPI device, such as a CD-ROM,
is attached.

2. Additional supported chipsets
The data transfer modes of the IDE controller in two additional
chipsets are described blow:

  Chipset    UDMA100  UDMA66  UDMA33  Multiword DMA  PIO
  VT82C686B  yes      yes     yes     up to mode 2   up to mode 4
  VT8231     yes      yes     yes     up to mode 2   up to mode 4

For your reference, the following table lists the data transfer
rates of 5 different IDE UDMA ATA devices with both chipsets.
For each device under test, the result was averaged on running
the test utility for a duration of 10 seconds and six times.
The results were not optimized and may vary from system to system.

                                 Transfer Rate (Unit: MB/Sec)
  Device Model   Company  Size   UDMA100     UDMA66     UDMA33
  ------------------------------------------------------------
  (VT82C686B)
  DTTA-350640    IBM      6.4G                          11.9
  DTLA-307030    IBM      30.7G  14.8**                 12.3
  DTTA-351010    IBM      10.1G                         11.4
  ST320424A      Seagate  20.4G  12.1**                 9.7
  GTLA-LM20A011  Quantum  20.5G              14.5       12.3
  ------------------------------------------------------------
  (VT8231)
  DTTA-350640    IBM      6.4G                          9.8
  DTLA-307030    IBM      30.7G  10.5**                 9.7
  DTTA-351010    IBM      10.1G                         9.5
  ST320424A      Seagate  20.4G  9.7**                  8.2
  GTLA-LM20A011  Quantum  20.5G              11.0**     10.2
  ------------------------------------------------------------
  ** 80-conductor ribbon cables were being used.

3. Background information
The IDE driver is capable of simultaneously supporting up to
4 IDE ATA devices. The driver automatically detects as many
IDE ATA devices as attached to the target platform. But the system
doesn't usually have 4 ATA devices, which may result in a long
time for device detection. Moreover, the system may use an
IDE ATAPI device, such as a CD-ROM, which may cause the IDE driver
to crash the system because it doesn't support IDE ATAPI devices.

4. Registry setting
Add the "Detect" key under the
[HKEY_LOCAL_MACHINE\Drivers\BuiltIn\VIAIDE] so that the IDE driver
will detect the specified IDE ATA device(s) according to its
setting, as described below.

   [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\VIAIDE]
         "Dll"="VIAIDE.dll"
         "Prefix"="DSK"
         "Order"=dword:4
         "Entry"="VIAIDEReg"
         "Keep"=dword:1
         "FSD"="FATFS.dll"
         "FastUltra"=dword:0
         "Folder"="IDEDSK"
   ENDIF

"Detect": the IDE device(s) that the driver will detect
          bit 0:
            1 to detect the primary master
            0 to bypass the primary master

          bit 1:
            1 to detect the primary slave
            0 to bypass the primary slave

          bit 2:
            1 to detect the secondary master
            0 to bypass the secondary master

          bit 3:
            1 to detect the secondary slave
            0 to ignore the secondary slave
          
5. Examples

   Case I:
     Use the following setting to detect only the primary master
     and primary slave.

        IF CEPC_IDE
        [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\VIAIDE]
           "Dll"="VIAIDE.dll"
           "Prefix"="DSK"
           "Order"=dword:4
           "Entry"="VIAIDEReg"
           "Keep"=dword:1
           "FSD"="FATFS.dll"
           "FastUltra"=dword:0
           "Folder"="IDEDSK"
           "Detect"=dword:3 
        ENDIF
  
   Case II:
     Use the following setting to detect only the primary master
     and secondary master.

        IF CEPC_IDE
        [HKEY_LOCAL_MACHINE\Drivers\BuiltIn\VIAIDE]
           "Dll"="VIAIDE.dll"
           "Prefix"="DSK"
           "Order"=dword:4
           "Entry"="VIAIDEReg"
           "Keep"=dword:1
           "FSD"="FATFS.dll"
           "FastUltra"=dword:0
           "Folder"="IDEDSK"
           "Detect"=dword:5
        ENDIF