pxa27x/spitz: serials in recent kernels

pxa27x/spitz: serials in recent kernels

[Pavel Machek]

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	
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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

[Pavel Machek]

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

Re: [Zaurus-devel] 8250 vs pxa_serial (was Re: pxa27x/spitz: serials in recent kernels)

[Dmitry Eremin-Solenikov]

[-- Attachment #1: Type: text/plain, Size: 1382 bytes --]

Hello,

On Tue, Apr 12, 2011 at 11:39 PM, Pavel Machek <pavel@ucw.cz> wrote:
> 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
> :-(.

Please try attached patch (then PXA consoles become ttySA0-3)




-- 
With best wishes
Dmitry

[-- Attachment #2: 0001-pxa-rename-serials-to-reuse-ttySA-naming.patch --]
[-- Type: text/x-patch, Size: 1123 bytes --]

From a325ef37aae1c155672f1502bc9864c0ee87cbd6 Mon Sep 17 00:00:00 2001
From: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Date: Tue, 4 Jan 2011 23:33:44 +0300
Subject: [PATCH] pxa: rename serials to reuse ttySA naming

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
---
 drivers/tty/serial/pxa.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 1102a39..14fb566 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -692,7 +692,7 @@ serial_pxa_console_setup(struct console *co, char *options)
 }
 
 static struct console serial_pxa_console = {
-	.name		= "ttyS",
+	.name		= "ttySA",
 	.write		= serial_pxa_console_write,
 	.device		= uart_console_device,
 	.setup		= serial_pxa_console_setup,
@@ -729,8 +729,8 @@ struct uart_ops serial_pxa_pops = {
 static struct uart_driver serial_pxa_reg = {
 	.owner		= THIS_MODULE,
 	.driver_name	= "PXA serial",
-	.dev_name	= "ttyS",
-	.major		= TTY_MAJOR,
+	.dev_name	= "ttySA",
+	.major		= 204,
 	.minor		= 64,
 	.nr		= 4,
 	.cons		= PXA_CONSOLE,
-- 
1.7.4.1

Re: [Zaurus-devel] 8250 vs pxa_serial (was Re: pxa27x/spitz: serials in recent kernels)

[Pavel Machek]

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.
...
> > ...but no luck. As soon as I enable 8250, pxa serials stop working
> > :-(.
> 
> Please try attached patch (then PXA consoles become ttySA0-3)

Thanks, this works for me. Can we get it into the tree?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [Zaurus-devel] 8250 vs pxa_serial (was Re: pxa27x/spitz: serials in recent kernels)

[Dmitry Eremin-Solenikov]

On Wed, Apr 13, 2011 at 5:28 PM, Pavel Machek <pavel@ucw.cz> wrote:
> 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.
> ...
>> > ...but no luck. As soon as I enable 8250, pxa serials stop working
>> > :-(.
>>
>> Please try attached patch (then PXA consoles become ttySA0-3)
>
> Thanks, this works for me. Can we get it into the tree?

This depends on Eric and Russell. IIRC such patches were declined
before.

-- 
With best wishes
Dmitry