Serial probs with 2.4.21-ac4 (slow, poss 2.5x serial driver)

Serial probs with 2.4.21-ac4 (slow, poss 2.5x serial driver)

Post by dan » Thu, 21 Aug 2003 19:09:56


Hi,
Can someone explain why the 2.5x serial drivers (in 2.4.21-ac4) are
breaking my PCMCICA modem? I'm using it with 2.4.20-8 (Redhat stock)
fine on /dev/ttyS0 with IRQ 3, but 2.4.21-ac4 (I'm assuming
they're backported 2.5/2.6 drivers) insists on assigning it
/dev/ttyS00
(although it is seen on /dev/ttyS0) and it will only work very, very
slowly (minicom takes over a minute to return the init string) unless
set to IRQ 0 (which is then also pretty slow).

I'm using a laptop so need the -ac series for the cpufreq patches and
the acpi support.

Any help appreciated

Dan
 
 
 

1. serial console after panic() (2.4.21)

2. 2.4.21: Sharing interrupts with serial console

I have read http://www.yqcomputer.com/
and http://www.yqcomputer.com/
and other items, but I still have not found the answers to the
following questions:

1. The rs_init function in ./linux-2.4.21/drivers/char/serial.c
explicitly states "The interrupt of the serial console port can't be
shared." Does this include *ALL* interrupts? The code checks for
sharing only with other serial devices, not *ALL* types of devices
like I2C, RTC, etc.

2. While the presence of the comment about not sharing was nice, it
does not explain "why?" Why can't we share the serial console
interrupt? The serial console seems to work when I alter serial.c to
skip this check for the sharing of interrupts with the serial console.

3. Does the hardware platform matter? We are running Linux 2.4.21 on
an embedded XScale(ARM)-based board.

Thanks,
Chris.
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