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

[kashin Lin]

Hi,

so do you think what may cause this situation happened?
( the output just stopped after "*Backed PXA serial*" as i mentioned in last
letter )

the system crash ? or the linux kernel just output messages by different way
(ex: not through RS232 or it use different UART setting) ?

thanks for your suggestions.


2007/9/12, Jorge Torres <jorge.torres.maldonado at gmail.com>:
>
> 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 )
> >
> > _______________________________________________
> > Developer mailing list
> > Developer at okl4.org
> > https://lists.okl4.org/mailman/listinfo/developer
> >
> >
>
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