Problem running Linux 2.6.11 on MPC8272ADS

[Walter L. Wimer III]

This matched my experience as well.

Does anyone know why U-Boot 1.1.1 from Freescale uses a different BCSR
address than U-Boot 1.1.1 from Sourceforge?

Any opinions on which address is the "correct" one to use?  Kumar asked
for a patch to fix this, so what do we think the correct fix is?



Thanks!

Walt



On Wed, 2005-03-30 at 10:18 +0200, Mike Rapoport wrote:
> Walter,
> Thanks for you help. I've discovered several things and now the things 
> seem to work fine.
> I've used u-boot-1.1.1 that came with the Freescale BSP and it maps BCSR 
> to 0xf8000000. The "regular" u-boot-1.1.1 (from sf.net) maps the BCSR to 
> 0xf4500000 as well as the kernel does (arch/ppc/platforms/pq2ads.h). The 
> difference causes the "hang"-like behaviour when the kernel initializes 
> serial comm and kernel crash afterwards when FCC is initialized.
> 
> Mike.
> 
> >Thanks for the data points, Alex.
> >
> >I'm using U-Boot 1.1.1 and vanilla kernel.org 2.6.11.4 (actually now
> >2.6.11.5).  My BCSR_ADDR looks the same as what you've listed below, so
> >I'd guess the difference is with U-Boot...  (Another engineer here
> >installed U-Boot on my board, from, I believe, a binary copy he got from
> >a Freescale(?) CD...  I didn't build U-Boot from source...  That's
> >something I'll need to take a look at...)
> >
> >Mike, have you discovered anything further about your problem?
> >
> >
> >
> >Walt
> >
> >
> >
> >On Tue, 2005-03-29 at 08:29 +0200, Bastos Fernandez Alexandre wrote:
> >  
> >
> >>Hi, 
> >>
> >>>From "linux/arch/ppc/platforms/pq2ads.h"
> >>#define BCSR_ADDR ((uint) 0xf4500000)
> >>>From "u-boot/include/configs/MPC8260ADS.h"
> >>#define CFG_BCSR 0xF4500000
> >>So ...
> >>Which version of u-boot and/or linux tree are you using?
> >>With linuxppc-2.5 and u-boot 1.2 everything works fine for me.
> >>Maybe Mike's problem is other. Maybe not. :-)
> >>
> >>Best regards,
> >>Alex
> >>
> >>    
> >>
> >>>-----Original Message-----
> >>>From:	Walter L. Wimer III [SMTP:walt.wimer at timesys.com]
> >>>Sent:	Monday, March 28, 2005 6:07 PM
> >>>To:	Mike Rapoport
> >>>Cc:	linuxppc-embedded at ozlabs.org
> >>>Subject:	Re: Problem running Linux 2.6.11 on MPC8272ADS
> >>>
> >>>
> >>>Hi Mike,
> >>>
> >>>I had the same "hang" experience.  The file arch/ppc/platforms/pq2ads.c
> >>>contains the following function:
> >>>
> >>>  void __init
> >>>  m82xx_board_setup(void)
> >>>  {
> >>>  	/* Enable the 2nd UART port */
> >>>  	*(volatile uint *)(BCSR_ADDR + 4) &= ~BCSR1_RS232_EN2;
> >>>  }
> >>>
> >>>
> >>>I had to ifdef-out the assignment statement above.  It appears that the
> >>>definition for BCSR_ADDR in the kernel code differs from what U-Boot is
> >>>using, and that area of memory isn't properly mapped into the kernel
> >>>address space this early in the boot sequence.  As a result, I was
> >>>getting an Oops() before the console was even enabled (I could see the
> >>>Oops message by examining the kernel's printk log buffer using a
> >>>BDI-2000 hardware debugger).
> >>>
> >>>
> >>>
> >>>Good luck,
> >>>
> >>>Walt Wimer
> >>>TimeSys Corporation
> >>>
> >>>
> >>>
> >>>
> >>>On Sun, 2005-03-27 at 11:31 +0200, Mike Rapoport wrote:
> >>>      
> >>>
> >>>>Hi,
> >>>>I'm trying to bring up the Linux 2.6.11 on MPC8272ADS and it seem to 
> >>>>hang up at the very beginning.
> >>>>I use ads8272_defconfig and then enable console on SCC:
> >>>>
> >>>>CONFIG_SERIAL_CPM=y
> >>>>CONFIG_SERIAL_CPM_CONSOLE=y
> >>>>CONFIG_SERIAL_CPM_SCC1=y
> >>>>
> >>>>
> >>>>when I boot the kernel from the u-boot the system hangs up right after 
> >>>>the kernel decompression.
> >>>>
> >>>>        
> >>>>
> >>>_______________________________________________
> >>>Linuxppc-embedded mailing list
> >>>Linuxppc-embedded at ozlabs.org
> >>>https://ozlabs.org/mailman/listinfo/linuxppc-embedded
> >>>      
> >>>
> >
> >
> >  
> >
>