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

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Message-ID: <BANLkTimTmhXYHYOQwh_Q1uohFJdaKecJkA@mail.gmail.com>
Date:	Wed, 13 Apr 2011 00:39:40 +0400
From:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To:	Zaurus PDA developers list <zaurus-devel@...ts.linuxtogo.org>
Cc:	Pavel Machek <pavel@....cz>, Andrea Adami <andrea.adami@...il.com>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [Zaurus-devel] 8250 vs pxa_serial (was Re: pxa27x/spitz: serials
 in recent kernels)

Hello,

On Tue, Apr 12, 2011 at 11:39 PM, Pavel Machek <pavel@....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

View attachment "0001-pxa-rename-serials-to-reuse-ttySA-naming.patch" of type "text/x-patch" (1123 bytes)