On 01/23/2013 04:26 PM, Sabuj Pattanayek wrote:
http://www.redhat.com/mirrors/LDP/HOWTO/Modem-HOWTO-18.html
Look at the very bottom 18.29 Troubleshooting tools
Beautiful!!!
These are some of the programs you might want to use in troubleshooting:
"lsof /dev/ttyS*" will list serial ports which are open.
"setserial" shows and sets the low-level hardware configuration of
a port (what the driver thinks it is). See What is Setserial
"stty" shows and sets the configuration of a port (except for that
handled by "setserial"). See the Serial-HOWTO section: "Stty".
"modemstat" or "statserial" or "watch head /proc/tty/driver/serial"
will show the current state of various modem signal lines (such as DTR,
CTS, etc.). The one in /proc also shows byte flow and errors.
"irqtune" will give serial port interrupts higher priority to
improve performance.
"hdparm" for hard-disk tuning may help some more.
"lspci" shows the actual IRQs, etc. of hardware on the PCI bus.
"pnpdump --dumpregs" shows the actual IRQs, etc. of hardware for
PnP devices on the ISA bus.
Some "files" in the /proc tree (such as ioports, interrupts, and
tty/driver/serial).
Howard
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