[PATCH] PPC 4xx: Enable XMON on PPC 4xx boards

[Paul Mackerras]

Josh Boyer writes:

> -		excp->msr |= 0x400;
> +		excp->msr |= MSR_SSTEP_ENABLE;
> +#ifdef CONFIG_4xx
> +		mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
> +#endif
>  	} else if (at_breakpoint(excp->nip)) {
>  		xmon_trace[smp_processor_id()] = BRSTEP;
> -		excp->msr |= 0x400;
> +		excp->msr |= MSR_SSTEP_ENABLE;
> +#ifdef CONFIG_4xx
> +		mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
> +#endif

This would be neater with a little inline xmon_enable_sstep(excp)
function...

Other than that, looks fine.

Paul.