Linux 2.6-10.rc3 8xx - Only 3 characters are printed well i n __ init start_kernel() upon kernel booting - why ?

[Hans Schillstrom]

On Mon, 2005-01-17 at 14:07, Povolotsky, Alexander wrote:
> Hi Hans,
> 
> Unfortunately I am not using u-boot.
> I am using "custom" bootloader (modified pSOS bootloader),
>  for which I do not have the source (and on top of - even if I would
> have the source for this bootloader - JTAG is not available to me to 
> reflash new version of the bootloader).
> 
> Is there any way to control (change) this in the kernel source itself ?

Actualy it's the bd_info struct that has to be correct 
when calling _start: (in head_8xx.c) 
I'm not shure about the behavior if it's null (I always use it).

> 
> Thanks,
> Best Regards,
> Alex
> 
> -----Original Message-----
> From: Hans Schillstrom [mailto:hans.schillstrom at pwav.com]
> Sent: Monday, January 17, 2005 2:10 AM
> To: Povolotsky, Alexander
> Subject: Re: Linux 2.6-10.rc3 8xx - Only 3 characters are printed well
> in __ init start_kernel() upon kernel booting - why ?
> 
> Hi,
> If you are using u-boot,
> have you checked the env. varialbe "clocks_in_mhz" ?
> if that one is set it turn out like that.
> 
> Regards
> /Hans
> 
> On Sun, 2005-01-16 at 20:54, Povolotsky, Alexander wrote:
> > > Per kind advise I have got, I have added baud rate to the command line
> (I
> > > did not have it there before):
> > > 
> > > CONFIG_CMDLINE="console=ttyCPM0,115200 panic=3 root=/dev/ram"
> > > 
> > > 	However, my real current problem (just 3 characters get printed
> > > correctly during the kernel boot) did not go away.
> > > 
> > > 	Is there a way to check if the baud rate specified in the .config's
> > > commandline is indeed in effect for the kernel booting ?
> > > 
> > > 	Any other reasons/explanation for my "3 character" problem ?
> > > 
> > > 	 -----Original Message-----
> > > 	From: 	Povolotsky, Alexander  
> > > 	Sent:	Sunday, January 16, 2005 5:59 AM
> > > 	To:	'linuxppc-dev at ozlabs.org'
> > > 	Subject:	Linux 2.6-10.rc3  8xx kernel booting - how to set
> > > baud rate for the serial driver ?
> > > 
> > > 	Hi,
> > > 	... 
> > > 	     
> > > 	My bootloader uses 115200 baud rate for the serial output during
> > > boot strapping.
> > > 
> > > 	I have:
> > > 	CONFIG_SERIAL_CPM_CONSOLE
> > > 	in my .config 
> > > 	... 
> > > I could see some output during the kernel boot -
> > > I noticed that (only 3) characters (see below) from the linux_banner are
> > > printed
> > > in __init start_kernel() upon booting . Then a lot of garbage is
> outputted
> > > and eventually kernel hangs ...
> > > 
> > > after gunzip
> > > done.
> > > Now booting the kernel
> > >
> LinÿÿÿÿÿÿÿÿÀÿÿÿÿÿÿÿÿÀ8ÀÿÿÿÿÿÿÿÿÀXÀÿÿÿÿÿÿÿÿÀxÀÿÿÿÿÿÿÿÿÀ~ÀÿÿÿÿÿÿÿÿÀ¸Àÿÿÿÿÿÿÿ
> > > ÿÀØÀÿÿ
> > > <more garbage>
> > > <hangs>
> > > 
> > > to prove it I added printk("ALEX\n"); in __init start_kernel() prior to
> > > printk(linux_banner);
> > > 
> > > ... 
> > > lock_kernel();
> > > page_address_init();
> > > printk("ALEX\n");
> > > printk(linux_banner);
> > > setup_arch(&command_line);
> > > setup_per_cpu_areas();
> > > ...
> > > 
> > > after gunzip
> > > done.
> > > Now booting the kernel
> > >
> ALEÿÿÿÿÿÿÿÿÀÿÿÿÿÿÿÿÿÀ8ÀÿÿÿÿÿÿÿÿÀXÀÿÿÿÿÿÿÿÿÀxÀÿÿÿÿÿÿÿÿÀ~ÀÿÿÿÿÿÿÿÿÀ¸Àÿÿÿÿÿÿÿ
> > > ÿÀØÀÿÿ
> > > <more garbage>
> > > <hangs>
> > > 
> > > Why would first 3 characters come out right ?
> > > Any ideas ?
> > > Thanks,
> > > 
> > _______________________________________________
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> > 
>