[U-Boot] [PATCH] MIPS: Hang if run on a secondary CPU

[Langer, Thomas]

Hello Paul,

> 
> diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S
> index fc6dd66..dd37ac3 100644
> --- a/arch/mips/cpu/start.S
> +++ b/arch/mips/cpu/start.S
> @@ -112,6 +112,31 @@ ENTRY(_start)
> 
>  	.align 4
>  reset:
> +#if __mips_isa_rev >= 6
> +	.set	push
> +	.set	reorder
> +	mfc0	t0, CP0_CONFIG, 1
> +	bgez	t0, 1f
> +	mfc0	t0, CP0_CONFIG, 2
> +	bgez	t0, 1f
> +	mfc0	t0, CP0_CONFIG, 3
> +	bgez	t0, 1f
> +	mfc0	t0, CP0_CONFIG, 4
> +	bgez	t0, 1f
> +	mfc0	t0, CP0_CONFIG, 5
> +	and	t0, t0, MIPS_CONF5_VP
> +	beqz	t0, 1f
> +
> +	mfc0	t0, CP0_GLOBALNUMBER
> +	b	2f
> +	.set	pop
> +#endif
> +
> +1:	mfc0	t0, CP0_EBASE
> +	and	t0, t0, EBASE_CPUNUM
> +
> +	/* Hang if this isn't the first CPU in the system */
> +2:	bnez	t0, .

This loop should include a "wait" instruction.
Otherwise the CPU will burn power for doing nothing.

Thomas