Problems porting to a custom PPC405GPr board using a vanilla 2.6.10 kernel

[Niklaus Giger]

Am Sonntag, 27. Februar 2005 17.08 schrieb Matt Porter:
> On Sun, Feb 27, 2005 at 04:10:30PM +0100, Niklaus Giger wrote:
> > Am Samstag, 26. Februar 2005 23.28 schrieb Niklaus Giger:
> > > Hi
> > >
> > > I would like to port Linux to a custom PPC405GPr board. Its hardware
> > > runs vxWorks fine for more than a year.
> >
> > I made some more progress. After adding 3 lines for MMU support with the
> > BDI I can debug the startup up to kernel_start using BDI.
> >
> > Afterwards my console changes the baudrate for still unknown reasons.
> How do you know this? Console isn't initialized until after the kernel
> command line printk and a few other facilities are initialized.
Because I see the following output
arch: exit
*Ë«ã¾µº³¹¿¾¶¹³¼±µ³ ¶·¾·¹·µ²´¹¶´¾³¿º··³³¦µ²»¹¿¾¤µ²¹±¾£µ¾¦µ²£¥¤¢½¹¼
´º·¾µ¼¹³¼³£µ²¾µ¼³·½½±¾´¼±¾µ³·¾»¿¼µ´¼¹«±° ¡¤¸±³¸¼±²¼µµ¾¼²±µ»·²´µ²²¹´µ³   
which for me is typical for a wrong baudrate. 
Okay, I do not know this. Specially it may not be the "console" device but 
whatever is going out at this moment via the PPC405GPr internal UART0 device.
> > Analysing the __log_buf I get the following output
> > (gdb) x/s &__log_buf
> > 0xc01accfc <ratelimit_lock.9>:   "<4>Linux version 2.6.10
> > (niklaus at ng.ngiger.dyndns.org) (gcc-Version 3.3.5 (Debian 1:3.3.5-8)) #15
> > Sun Feb 27 14:44:27 CET 2005\n<7>On node 0 totalpages: 8240\n<7>  DMA
> > zone: 8240 pages, LIFO batch:2\n<7>"...
> > (gdb) x
> > 0xc01acdc4 <ratelimit_lock.9+200>:       "  Normal zone: 0 pages, LIFO
> > batch:1\n<7>  HighMem zone: 0 pages, LIFO batch:1\n<4>Built 1
> > zonelists\n<4>Kernel command line: ip=172.25.1.6\n<4>PID hash table
> > entries: 256 (order:8, 4096 bytes)\n"
> > (gdb) x
> > 0xc01ace84 <ratelimit_lock.9+392>:       ""
>
> Is this all of the log_buf output? Try setting your kernel cmdline
> with "console=ttyS0,115200" where 115200 is you console baudrate
> you are using in U-Boot. Otherwise, the kernel 8250 driver has no
> idea which baudrate to set for the 8250/console.
Yes, this is all. I tried you suggestion, but I got no other result. The 
paramter "console=ttyS0,9600" now is found in the log buffer. Or is ttyS0 the 
wrong device name for the internal PPC405Gpr UART0?
I am using 9600 8 bit no parity which should be anyway the default baudrate 
for the console.

Thanks for your help
-- 
Niklaus Giger
Wieshoschet 6
CH-8753 Mollis
Tel. ++41 55 612 20 54 (privat)
Tel. ++41 55 618 64 68 (Geschäft)