On Mon, May 24, 2010 at 7:36 AM, Everett Wang <[email protected]> wrote:
> On Mon, May 24, 2010 at 12:28 AM, Wolfgang Grandegger <[email protected]>
> wrote:
>> On 05/23/2010 06:19 PM, Everett Wang wrote:
>>> On Sun, May 23, 2010 at 11:46 PM, Wolfgang Grandegger <[email protected]>
>>> wrote:
>>
>>>> There are other possibilities to interact with Linux, e.g. telnet,
>>>> slogin or netcat. But it's always good to have a console.
>>>>
>>> I guess I need a USB to ethernet for these.
>>
>> Yes.
>>
>> ...
>>>> All three uarts are occupied by Linux and you cannot use them as
>>>> rtserial. First you need to release at least one of them. What Linux
>>>> config do you use for your board?
>>>
>>> I didn't do any configuration. Do you mean to config these during kernel
>>> configuration?
>>
>> Can you show us the .config of your kernel?
>>
>> Some more insights:
>>
>> I think the serial ports for the beagle boards are configured in:
>>
>> http://lxr.linux.no/#linux+v2.6.34/arch/arm/mach-omap2/serial.c
>>
>> Therein you find entries like:
>>
>> http://lxr.linux.no/#linux+v2.6.34/arch/arm/mach-omap2/serial.c#L82
>>
>> As you can see, a regshift of 2 is used, which is not yet supported by
>> the 16550A RTDM driver. Should not be a big deal to add it, though.
>> Also, as "baud_base" you should use OMAP24XX_BASE_BAUD.
>>
>> Wolfgang.
>>
>
> Thanks for the suggestions. The .config file is attached. I will look at the
> code you pointed to today to study the configuration of the serial port.
>
> Everett
>
Hi Wolfgang,
I looked at the serial.c and function you pointed too. I have can't figure
out how to modify it. Could you point me to the right direction to read so
I can understand and eventually improve the serial for beagleboard? I thought
I could limit the kernel to use only one of the uart (console) by
changing function
__init omap_serial_init(void):
void __init omap_serial_init(void)
{
int i;
// for (i = 0; i < ARRAY_SIZE(omap_uart); i++)
// omap_serial_init_port(i);
omap_serial_init_port(2);
}
But the kernel hangs during booting after printing this message:
uncompressing Linux... done.
I guess it is not that simple to let kernel not to claim the uart0 and uart1.
Everett
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