SMP in 32-bit arch/powerpc

Kumar Gala galak at
Wed Aug 2 23:32:14 EST 2006

On Aug 2, 2006, at 3:25 AM, Adrian Cox wrote:

> Is anybody else having problems with 32-bit SMP support in arch/ 
> powerpc?
> I'm using 2.6.17 as my current base, because I've not yet merged the
> latest mpic changes.
> I'm currently bringing up a dual-7448 board, and when I build the  
> kernel
> with CONFIG_SMP, the bootmem allocator corrupts the device tree. The
> strange thing is, this still happens when I don't start the second  
> CPU.
> Kernels built without CONFIG_SMP run flawlessly on the same hardware.

There are a few patches to prom.c that may help.  I know I've run  
into this on other 32-bit systems booting from u-boot.  These patches  
resolved my issue.

* [PATCH] powerpc: Auto reserve of device tree blob
* [POWERPC] Prevent duplicate lmb reservations for Device...

- kumar

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