Here is some output from linux booting log:
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing isabled
serial8250.0: ttyS0 at MMIO 0xe000c000 (irq = 6) is a 16550A
serial8250.0: ttyS1 at MMIO 0xe0010000 (irq = 7) is a 16550A
serial8250.0: ttyS2 at MMIO 0xe0078000 (irq = 28) is a 16550A
serial8250.0: ttyS3 at MMIO 0xe007c000 (irq = 29) is a 16550A
Am i right saying that irqs were installed and are being used properly
according to the log above? The crystal which I am using is lpc2468 with
the following definitions from 8250.c:
No. That just says what it thinks is right.
If you want to know, check /proc/interrupts and make sure the count is
going up on the serial port you are using.
Count is definitely going up, Lennart.. Could you please give more tips? :)
Guys, i've just figured out a strange behaviour of the serial driver. As
I mentioned above in my previous letter, irq count is going up fast
enough (serial tx period is ~100 ms now). I started to debug 8250.c and
append debug strings to different functions and to
serial8250_backup_timeout function in particular. The debug string from
this function appears in the console. So.. right after that i started to
adjust timeouts in the following strings related to the polling mode of
the driver:
mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout) + HZ/5);
mod_timer(&up->timer, jiffies + poll_timeout(up->port.timeout) + HZ/5);
I've changed the division rate from 5 to 50: HZ/5 -> HZ/50.
<Actung> Right after that data becomes to appear on the pin in (0;20 ms]
range. It seems that driver works in polling-mode despite the fact that
irq are being counted properly.
My next question is to the person who is familiar with the working
principles of this driver: what settings should i do to make irqs work
properly in this case (16550A driver and lpc2468 processor)?
--
Agava Design Bureau
620026, Russia, 620026, Yekaterinburg, Bazhova str. 174
tel./fax. +7 (343) 262-92-76, 262-92-78, 262-92-87
http://kb-agava.ru
_______________________________________________
uClinux-dev mailing list
uClinux-dev@uclinux.org
http://mailman.uclinux.org/mailman/listinfo/uclinux-dev
This message was resent by uclinux-dev@uclinux.org
To unsubscribe see:
http://mailman.uclinux.org/mailman/options/uclinux-dev
