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2000-10-29
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3COM 3C589 PCMCIA NIC Driver Patches
29 Oct 2000
Steven H. Levine
steve53@earthlink.net
These patches address two problems with the 3COM 3C589 drivers.
1. The 3COM 3C589 driver, elpc3.os2, traps on systems with clock rates over
500 mHz.
2. The log extract tool, 3net_log.exe, will not work with the v1.8
drivers.
THE ELPC3.OS PATCH
Elpc3.os2 traps because it calculates a buffer size based on the number of
bytes that can be processed in a fixed time period. On a faster CPU, more
bytes can be processed. This byte count is the dividend of a divide
operation. When this dividend becomes large enough, the divide instruction
fails with a divide overflow because the quotient no longer fits in a 16-bit
register. The patch doubles the divisor and should avoid the trap for
systems with clock rates up to 1 GHz. Beyond this, the divisor will need to
be doubled again.
The patch is designed for the v1.8 driver:
ELPC3.OS2 30,237 10-27-96
It has been reported that other 3COM drivers suffer the same failures on fast
systems. I have not investiagated this, but it is likely that these failures
occur for the same reason and a similar patch will avoid the failure.
THE 3NET_LOG.EXE PATCH
The 3c589 driver saves log messages internally. The 3net_log utility
extracts the messages and writes them to the screen or to a file. The
version of the utility delivered with the v1.8 drivers no long works because
the programmer(s) did not update the version number check to match the
driver version. The patch modifies 3net_log.exe to check for a v1.8 driver.
The patch is built for:
3NET_LOG.EXE 13,065 8-11-95
The patches are supplied as .PAT files. Apply the patches to a copy of the
programs using the OS/2 PATCH utility.
*** USE AT YOUR OWN RISK ***
This program is provided AS IS without any warranty, expressed or implied,
including but not limited to fitness for a particular use. The user is
responsible for the results of correct or incorrect usage of this software.