Problem running Linux 2.6.11 on MPC8272ADS

[Walter L. Wimer III]

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.
>