The system running under QNX 4.25 RTOS in PC H/W platform. The
Can anybody give some clue to this problem? How to solve this problem?application software connects to a number of devices (card
through RS 422 port. The transmission is at 9600 baud. The system
perfectly with old PC (up to Pentium 3 PC). When the same
software is run in Pentium 4 based PC (2.6GHz - 3 GHz), it is
that for lower system clock (2.6 GHz) the application software
communicates to serial card readers without any problem.
When connected in Petium 4 PC (3 GHz) with higher PCI clock, it
observed that application software terminates after indicating
''''Memory Fault'''' (SIGSEGV), at memory xxxx:xxxx.
It is observed that
if we remove the Ethernet Networking card from PCI slot 1 and
CP-132 in that slot and donot put the Ethernet card, the system
give any memory fault. However, it does not carry out any serial
communication function (both transmission and reception).
It is to be mentioned here, for lower speed PC, the serial card
slot dependant, whereas for higher speed PC, the serial card work
in specific slot (slot 1). The size of RAM in lower speed PC is
less (256MB). It is found from BIOS setup that 2.66GHz PC is
DRAM frequency of 100MHz whereas for 3 GHz PC, the system
800MHz and System Memory speed is 266 MHz.
Thanks in advance.