[okl4-developer] does linux(Wombat) re-configure UART when booting?

[Jorge Torres]

Hi Kashin,

Printk is used for outputs inside the Linux kernel in an interrupt context
and process context, meaning that it will allways happen, which is not the
case of printf.

Cheers,

Jorge


On 9/11/07, kashin Lin <kashin08 at gmail.com> wrote:
>
> i build okl4 for my pxa270 develop board and upload the image on it.
> but the ouput messages just stop appearing as following:
>
> *OKL4 - (provider: Open Kernel Labs) built on Sep 4 2007 03:31:16 using
> gcc version 3.4.4.
> init_spaceids:125: Init spaceids 256 spaces
>
> *****************************************
> * Iguana system, Copyright 1996-2006 *
> * ERTOS - National ICT Australia *
> *****************************************
>
> vbase is 0x1302000, vend is 0xcfffffff
> addr is 0x1302000, vbase is 0x1302000
> PXA25X OS Timer driver starting...
> PXA25X wrap handler installed
> Using FFUART.
> Backed PXA serial*
>
> the stop timming seems to be at the beginning of Wombat which
> use "printk" as it output function.
> ( the function for ouputing the message i got (above) seems to be "printf"
> ).
>
> so i think there are two posible causes:
> 1. "prink" use the different way to ouput (comparing to "printf" )or
>     Wombat re-configure UART, so the full system is working but
>     i can't see the ouput messages.
>    ( the required setting to connect my develop board by RS232 is 9600 8 n
> 1)
>
> 2. the system is really stopping due to some reasons...
>
> so how can i recognize which one is the actual cause of this situation?
> will option 1 occur?
> (i'm not sure the difference between printk & printf's implementation )
>
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