[PATCH 8/8] mx25 3ds: add support for boot from UART

[Sascha Hauer]

On Wed, Jun 09, 2010 at 10:05:07AM +0300, Baruch Siach wrote:
> For details of the UART protocol see the i.MX25 Reference Manual, section 7.8
> "Serial Download protocol".
> 
> Signed-off-by: Baruch Siach <baruch at tkos.co.il>
> ---
>  arch/arm/mach-imx/Kconfig                    |    5 +++++
>  board/freescale-mx25-3-stack/3stack.c        |    4 ++++
>  board/freescale-mx25-3-stack/lowlevel_init.S |    5 +++++
>  3 files changed, 14 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
> index 419daab..40cebed 100644
> --- a/arch/arm/mach-imx/Kconfig
> +++ b/arch/arm/mach-imx/Kconfig
> @@ -319,6 +319,11 @@ config FREESCALE_MX25_3STACK_SDRAM_64MB_DDR2
>  config FREESCALE_MX25_3STACK_SDRAM_128MB_MDDR
>  	bool "128 MB (mDDR)"
>  endchoice
> +
> +config FREESCALE_MX25_3STACK_UART_BOOT
> +	bool "Boot from UART"
> +	depends on ARCH_IMX_INTERNAL_BOOT
> +
>  endif
>  endmenu
>  
> diff --git a/board/freescale-mx25-3-stack/3stack.c b/board/freescale-mx25-3-stack/3stack.c
> index a657a47..081487a 100644
> --- a/board/freescale-mx25-3-stack/3stack.c
> +++ b/board/freescale-mx25-3-stack/3stack.c
> @@ -44,7 +44,11 @@ extern unsigned long _stext;
>  
>  void __naked __flash_header_start go(void)
>  {
> +#if defined CONFIG_FREESCALE_MX25_3STACK_UART_BOOT
> +	__asm__ (".word	exception_vectors\n");
> +#else
>  	__asm__ __volatile__("b exception_vectors\n");
> +#endif

Do we need this change? I booted other i.MX SoCs without it. I really
like to keep this because it enables to jump to the first address if
booting second stage.

Sascha


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