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, 

quoted

From "linux/arch/ppc/platforms/pq2ads.h"

#define BCSR_ADDR ((uint) 0xf4500000)

quoted

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

quoted

-----Original Message-----
From:	Walter L. Wimer III [SMTP:walt.wimer@timesys.com]
Sent:	Monday, March 28, 2005 6:07 PM
To:	Mike Rapoport
Cc:	linuxppc-embedded@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:

quoted

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@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-embedded