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viaideinfo is a command-line application for Linux which displays various information and statistics about VIA IDE controller hardware installed in the system.

This information is already available through /proc/ide/via if the via82cxxx driver is active. However, this proc file may be removed in future to reduce complexity of the kernel driver.

Sample Output

----------VIA BusMastering IDE Configuration----------------
viaideinfo Version:                 0.2
South Bridge:                       VIA vt8233a Rev 0x0 (PCI 00:11.0)
IDE Controller:                     Rev 0x6 (PCI 00:11.1)
Highest DMA rate:                   UDMA133
BM-DMA base:                        0xd800
PCI clock:                          33.3MHz
Master Read  Cycle IRDY:            0ws
Master Write Cycle IRDY:            0ws
BM IDE Status Register Read Retry:  yes
Max DRDY Pulse Width:               No limit
-----------------------Primary IDE-------Secondary IDE------
Read DMA FIFO flush:          yes                 yes
End Sector FIFO flush:         no                  no
Prefetch Buffer:              yes                 yes
Post Write Buffer:            yes                 yes
Enabled:                      yes                 yes
Simplex only:                  no                  no
Cable Type:                   80w                 80w
Transfer Mode:       UDMA       PIO      UDMA       PIO
Address Setup:      120ns     120ns     120ns     120ns
Cmd Active:          90ns      90ns      90ns      90ns
Cmd Recovery:        30ns      30ns      30ns      30ns
Data Active:         90ns      90ns      90ns     330ns
Data Recovery:       30ns      30ns      30ns     270ns
Cycle Time:          22ns     120ns      60ns     600ns
Transfer Rate:   88.8MB/s  16.6MB/s  33.3MB/s   3.3MB/s

More Info

From the README:

This command-line application identifies VIA IDE controllers installed in the
computer, and displays various information/statistics regarding these.

viaideinfo depends on libpci from the pciutils package.
viaideinfo does not depend on the via82cxxx kernel IDE driver, and will work
regardless of whether it is present or not.

The following devices are supported:
	vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
	vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
	vt8235, vt8237, vt8237a, vt8251, vt6410, vt8237s, cx700

For basic usage info, run "viaideinfo --help". For even more detail, read the
man page (and the rest of this document!)

All this information used to be available through /proc/ide/via - however this
file was removed in Linux 2.6.15 to reduce complexity of the IDE driver.

As viaideinfo performs some basic port I/O, it must be run as root.

viaideinfo always displays information about the first VIA IDE controller it
finds, but on the rare event that you have more than one, you can use the "-d"
argument to specify another device to query.

Note that the "-d" argument will not do any sanity checking (other than
existance of the specified device) - and you _will_ get strange results printed
on-screen if you choose to feed it the address of something that is not a VIA
IDE controller!

This program relies heavily upon identifying a VIA ISA Bridge *as well as* an
IDE controller.

If your ISA bridge is not recognised by this program, then you'll have to drop
me an email with your `lspci -vvv` output so that I can add support for it.

On the other hand, if your ISA bridge is identified, but your IDE controller
is not, then you are not completely out of luck. You can use the '-d' argument
as specified above, to select a specific PCI devices such as "00:11.1"
(see the first column of your `lspci` output). If this is the case, please
email me anyway so that automatic support can be added.

In order to calculate timing data outputted by this application, an IDE bus
speed of 33MHz is assumed. This is the same as what the kernel does.
However, while this is accurate for the majority of setups, it is not always
correct. Some motherboards overclock the bus to 37.5MHz. If you've somehow
managed to fit a 486 chip into your AMD-based VIA board, then you might even
have a bus speed of 25MHz. You can modify the speed used for calculations with
the '-c' argument (e.g. '-c 37').


viaideinfo is available under the GNU GPL Version 2.

Maintenance takes place in a git repository.


Daniel Drake <>

viaideinfo was based on code found in the Linux kernel.