[U-Boot] [PATCH] MIPS: Add CONFIG_SKIP_LOWLEVEL_INIT

[Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>]

Stefan Roese wrote:
> This patch adds the CONFIG_SKIP_LOWLEVEL_INIT option to start.S. This
> enables support for boards where the lowlevel initialization is
> already done when U-Boot runs (e.g. via OnChip ROM).
> 
> This will be used in the upcoming VCTH board support.
> 
> Signed-off-by: Stefan Roese <sr@denx.de>

Acked-by: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>


> ---
>  cpu/mips/start.S |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/cpu/mips/start.S b/cpu/mips/start.S
> index 0a69109..57db589 100644
> --- a/cpu/mips/start.S
> +++ b/cpu/mips/start.S
> @@ -243,9 +243,11 @@ reset:
>  	mtc0	zero, CP0_COUNT
>  	mtc0	zero, CP0_COMPARE
>  
> +#if !defined(CONFIG_SKIP_LOWLEVEL_INIT)
>  	/* CONFIG0 register */
>  	li	t0, CONF_CM_UNCACHED
>  	mtc0	t0, CP0_CONFIG
> +#endif /* !CONFIG_SKIP_LOWLEVEL_INIT */
>  
>  	/* Initialize $gp.
>  	 */
> @@ -255,6 +257,7 @@ reset:
>  1:
>  	lw	gp, 0(ra)
>  
> +#if !defined(CONFIG_SKIP_LOWLEVEL_INIT)
>  	/* Initialize any external memory.
>  	 */
>  	la	t9, lowlevel_init
> @@ -271,6 +274,7 @@ reset:
>  	 */
>  	li	t0, CONF_CM_CACHABLE_NONCOHERENT
>  	mtc0	t0, CP0_CONFIG
> +#endif /* !CONFIG_SKIP_LOWLEVEL_INIT */
>  
>  	/* Set up temporary stack.
>  	 */