Subject: Re: [Cbe-oss-dev] [PATCH] Ignore memory listed in PS3 device tree

From: Geoff Levand <[email-masked]>
Date: Fri, 06 Apr 2007 14:22:34 -0700

David Woodhouse wrote:
> The old 2.6.16 kernel handled memory statically and it was shown in the
> device tree. The current kernel deals with the hypervisor and hotplugs
> the memory, so we should just ignore anything that's reported in the
> device-tree. This enables the current kernel to be booted from 2.6.16
> without evil hacks in head_64.S to override the device-tree.
> 
> Signed-off-by: David Woodhouse <[email-masked]>
> 
> diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
> index 08bd255..dd38408 100644
> --- a/arch/powerpc/kernel/prom.c
> +++ b/arch/powerpc/kernel/prom.c
> @@ -52,6 +52,7 @@
>  #include <asm/pSeries_reconfig.h>
>  #include <asm/pci-bridge.h>
>  #include <asm/kexec.h>
> +#include <asm/firmware.h>
>  
>  #ifdef DEBUG
>  #define DBG(fmt...) printk(KERN_ERR fmt)
> @@ -862,6 +863,9 @@ static int __init early_init_dt_scan_memory(unsigned long node,
>  	cell_t *reg, *endp;
>  	unsigned long l;
>  
> +	if (firmware_has_feature(FW_FEATURE_PS3_LV1))
> +		return 0;
> +
>  	/* Look for the ibm,dynamic-reconfiguration-memory node */
>  	if (depth == 1 &&
>  	    strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0)
> 

I committed a change that pulls the command line out of the incompatible DT and
merges it with the built-in DT.

  http://git.kernel.org/?p=linux/kernel/git/geoff/ps3-linux-patches.git;a=blob;f=ps3-hacks/ps3-no-bootwrapper-hack.diff

-Geoff