[U-Boot] How can I make a second serial port on a motorola 8248 Chip known to Linux.

[U-Boot] How can I make a second serial port on a motorola 8248 Chip known to Linux.

[AGKohler]

Hello,

I am working with a mpc8260ads(actually QUICC 8248 processor) based board. 
There are two hardware rs-232 ports available. 
I can switch the console between the two by switching the CONFIG_CONS_INDEX 
configuration variable between 1 and 4.
I would like to have both ports in service, when Linux comes up. One as the
console and the second to communicate with(i.e. acquire data from) a third
party rs-232 device. Eventually, the third party device may be a telephone
modem. Can anyone explain how to accomplish this, and if not, what
constraints are blocking the accomplishment of my requirements. Any
suggestions will be appreciated.

Thank You.

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[U-Boot] How can I make a second serial port on a motorola 8248 Chip known to Linux.

[Scott Wood]

On Tue, Aug 25, 2009 at 08:37:11AM -0700, AGKohler wrote:
> 
> Hello,
> 
> I am working with a mpc8260ads(actually QUICC 8248 processor) based board. 
> There are two hardware rs-232 ports available. 
> I can switch the console between the two by switching the CONFIG_CONS_INDEX 
> configuration variable between 1 and 4.
> I would like to have both ports in service, when Linux comes up. One as the
> console and the second to communicate with(i.e. acquire data from) a third
> party rs-232 device. Eventually, the third party device may be a telephone
> modem. Can anyone explain how to accomplish this, and if not, what
> constraints are blocking the accomplishment of my requirements. Any
> suggestions will be appreciated.

This isn't a U-Boot issue, except insofar as U-Boot passes a device tree
to Linux (assuming it does even that -- you don't mention which kernel or
u-boot version you're using).

If your device tree contains both serial ports, then Linux should be able
to use them both.  If it doesn't work, make sure all the pins are
configured correctly, typically by Linux platform code for your board
(though ideally U-Boot should set them up as well).

-Scott

[U-Boot] How can I make a second serial port on a motorola 8248 Chip known to Linux.

[AGKohler]

I am using u-boot version 1.1.3, kernel, Linux(Debian) is version 2.6.12.
I searched through the kernel configuration options via menuconfig, i could
not find 
anything that configures the number of serial ports. In LINUX, i tried
creating ttyS1 with
"mknod -m 660 /dev/ttS1 c 4 65". A /dev/ttyS1 shows up in the directory
listing, but I am unable to
transmit/receive characters on it.

Thanks.







Scott Wood-2 wrote:
> 
> On Tue, Aug 25, 2009 at 08:37:11AM -0700, AGKohler wrote:
>> 
>> Hello,
>> 
>> I am working with a mpc8260ads(actually QUICC 8248 processor) based
>> board. 
>> There are two hardware rs-232 ports available. 
>> I can switch the console between the two by switching the
>> CONFIG_CONS_INDEX 
>> configuration variable between 1 and 4.
>> I would like to have both ports in service, when Linux comes up. One as
>> the
>> console and the second to communicate with(i.e. acquire data from) a
>> third
>> party rs-232 device. Eventually, the third party device may be a
>> telephone
>> modem. Can anyone explain how to accomplish this, and if not, what
>> constraints are blocking the accomplishment of my requirements. Any
>> suggestions will be appreciated.
> 
> This isn't a U-Boot issue, except insofar as U-Boot passes a device tree
> to Linux (assuming it does even that -- you don't mention which kernel or
> u-boot version you're using).
> 
> If your device tree contains both serial ports, then Linux should be able
> to use them both.  If it doesn't work, make sure all the pins are
> configured correctly, typically by Linux platform code for your board
> (though ideally U-Boot should set them up as well).
> 
> -Scott
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
> 
> 

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[U-Boot] How can I make a second serial port on a motorola 8248 Chip known to Linux.

[Scott Wood]

On Wed, Aug 26, 2009 at 01:15:39PM -0700, AGKohler wrote:
> I am using u-boot version 1.1.3, kernel, Linux(Debian) is version 2.6.12.

Both of thosed are extremely old.  Our ability to help you with them is
very limited.  Please use the current code.

> I searched through the kernel configuration options via menuconfig, i could
> not find 
> anything that configures the number of serial ports. In LINUX, i tried
> creating ttyS1 with
> "mknod -m 660 /dev/ttS1 c 4 65". A /dev/ttyS1 shows up in the directory
> listing, but I am unable to
> transmit/receive characters on it.

You want /dev/ttyCPM1, and you should use udev or equivalent to create
the device nodes.

-Scott

[U-Boot] How can I make a second serial port on a motorola 8248 Chip known to Linux.

[Wolfgang Denk]

Dear AGKohler,

please do not top post-full quote.

Make sure to read http://www.netmeister.org/news/learn2quote.html

And please note that this still off topic on this list. It is a LINUX
question, not an U-Boot one.


In message <25157108.post@talk.nabble.com> you wrote:
> 
> I am using u-boot version 1.1.3, kernel, Linux(Debian) is version 2.6.12.

This is very, very old code, and you will probably find nobody willing
to spend time and efforts for free to deal with issues that have been
solved long, long ago.

Please update your code - say, use at least U-Boot v2009.03 (or later)
and Linux 2.6.30 (or later), and if you still have issues, please ask
on a Linux mailing list.

Best regards,

Wolfgang Denk

-- 
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HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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