linux-kernel - 8250 vs pxa_serial (was Re: pxa27x/spitz: serials in recent kernels)

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Date:	Tue, 12 Apr 2011 21:39:43 +0200
From:	Pavel Machek <pavel@....cz>
To:	Andrea Adami <andrea.adami@...il.com>
Cc:	zaurus-devel@...ts.linuxtogo.org,
	kernel list <linux-kernel@...r.kernel.org>
Subject: 8250 vs pxa_serial (was Re: pxa27x/spitz: serials in recent
 kernels)

Hi!

> > I cculd not get serial port to work in recent kernels (2.6.35 was
> > oldest I tried). I know they are little used but still very useful for
> > debugging.
> >
> > Is there some special config that needs to be done?
> >                                                        Pavel
> 
> I have output on ttyS0 using the Sharp cable, never had issues.
> Remember that bootloader is 9600n8 while kernels are usually 115200n8.

Ok, I know what is going on. I need both PXA_SERIAL and 8250... and
these two don't go well together.

I tried:

CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_8250_CONSOLE is not set
CONFIG_SERIAL_8250_CS=y
CONFIG_SERIAL_8250_NR_UARTS=1
CONFIG_SERIAL_8250_RUNTIME_UARTS=0
# CONFIG_SERIAL_8250_EXTENDED is not set

#
# Non-8250 serial port support
#
# CONFIG_SERIAL_MAX3100 is not set
# CONFIG_SERIAL_MAX3107 is not set
CONFIG_SERIAL_PXA=y
CONFIG_SERIAL_PXA_CONSOLE=y
CONFIG_SERIAL_CORE=y
CONFIG_SERIAL_CORE_CONSOLE=y

(BTW should 8250_RUNTIME_UARTS be called "boottime uarts"? That's what
help says).

...but no luck. As soon as I enable 8250, pxa serials stop working
:-(.
										Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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