Serial driver problem (modem Lombard)
toa at pop.agri.ch
Sun Apr 23 02:17:37 EST 2000
Bernhard Reiter wrote:
> There is a difference in modem device behaviour
> between 2.2.15pre3(coming with LinuxPPC2000) and 2.2.15pre19(after
> Paul M's stable tree, build myself using his .config).
Depends on how you got the 2.2.15p19, I had some difficulties due to the
fact that I was too fast. Paul did a backport of ppp-2.4.x to 2.2.x and
I rsynced it with the auvz --delete option; In the wrong moment!!!. But
it wasn't meant for 2.2.x.
So only a clean download helped me. (not all the stuff, only with the -u
disabled (update == looks for date))
Now I can report a clean, more or less, well ppp operation.
> wvdail cannot open /dev/ttyS0 twice with 2.2.51pre19.
> After I ctrl-ced wvdial to interrupt the network connection
> I get an I/O error when I try to open it again.
Do you have the module option in char/devices/serial on? (dumb serial device)
If so, it can tend to a machine check, when you load a module. The patch
below will/could help you maybe. I never got as far to include it into
the kernel stuff....(Paul/Ben?)
> Running wvdialconf it started scanning ttyS1 and
> then jumped into the system monitor:
Don't know about a lombard, but a wallstreet has 4 tty's 0,1,2,3
(serial/printer =0, IRDA =1, modem =2; which is not present in my case;
third = 3, the third is unused, I think the lombard has only one SCC so
you can change the SERIAL_DEV_OFFSET to 2 iso 4.
> vector:200 at pc=d0849344 msr=1030, sp=c7bf3ce0 [c7bf3ce0]
> current=c7bf2000, pid 745 comm=insmod
> Maybe that is an irport error and unrelated to the first problem.
> I have not enquired further, though.
So as for trial and error I'd suggest to disable some serial modules.
> ps: Please carbon copy relevant replies to me.
CC? or reply?
these are my to RP. (chf exchange.....)
-------------- next part --------------
--- linux-pmac-stable/drivers/char/serial.c Tue Feb 8 00:46:49 2000
+++ linux/drivers/char/serial.c Mon Feb 14 18:35:47 2000
@@ -150,6 +150,12 @@
+#define SERIAL_DEV_OFFSET 4
+#define SERIAL_DEV_OFFSET 0
#define _INLINE_ inline
@@ -3126,7 +3132,7 @@
serial_driver.driver_name = "serial";
serial_driver.name = "ttyS";
serial_driver.major = TTY_MAJOR;
- serial_driver.minor_start = 64;
+ serial_driver.minor_start = 64 + SERIAL_DEV_OFFSET;
serial_driver.num = NR_PORTS;
serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
serial_driver.subtype = SERIAL_TYPE_NORMAL;
@@ -3190,11 +3196,14 @@
state->icount.frame = state->icount.parity = 0;
state->icount.overrun = state->icount.brk = 0;
state->irq = irq_cannonicalize(state->irq);
+#ifndef CONFIG_PMAC /* XXX */
if (state->flags & ASYNC_BOOT_AUTOCONF)
+#ifndef CONFIG_PMAC /* XXX */
* Detect the IRQ only once every port is initialised,
* because some 16450 do not reset to 0 the MCR register.
@@ -3212,6 +3221,7 @@
@@ -3264,22 +3274,22 @@
state->irq = detect_uart_irq(state);
printk(KERN_INFO "tty%02d at 0x%04x (irq = %d) is a %s\n",
- state->line, state->port, state->irq,
+ state->line + SERIAL_DEV_OFFSET, state->port, state->irq,
- return state->line;
+ return state->line + SERIAL_DEV_OFFSET;
void unregister_serial(int line)
unsigned long flags;
- struct serial_state *state = &rs_table[line];
+ struct serial_state *state = &rs_table[line + SERIAL_DEV_OFFSET];
if (state->info && state->info->tty)
state->type = PORT_UNKNOWN;
- printk(KERN_INFO "tty%02d unloaded\n", state->line);
+ printk(KERN_INFO "tty%02d unloaded\n", state->line + SERIAL_DEV_OFFSET);
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