[U-Boot] [PATCH 3/8] ZOOM2 Add support for debug board detection.

[Dirk Behme <dirk.behme@googlemail.com>]

Hi Tom,

Tom Rix wrote:
> https://omapzoom.org/gf/project/omapzoom/wiki/?pagename=GettingStartedWithZoomII_AKA_OMAP34XII_MDP
> 
> The zoom2 has an auxillary board that contains the serial, net, jtag and
> battery simulator.  This change supports a runtime check if the debug board is
> connected.
> 
> Signed-off-by: Tom Rix <Tom.Rix@windriver.com>
> ---
>  board/omap3/zoom2/Makefile      |    3 +-
>  board/omap3/zoom2/debug_board.c |   57 +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 1 deletions(-)
>  create mode 100644 board/omap3/zoom2/debug_board.c
> 
> diff --git a/board/omap3/zoom2/Makefile b/board/omap3/zoom2/Makefile
> index 088b8cb..b8fa5a7 100644
> --- a/board/omap3/zoom2/Makefile
> +++ b/board/omap3/zoom2/Makefile
> @@ -25,7 +25,8 @@ include $(TOPDIR)/config.mk
...
> --- /dev/null
> +++ b/board/omap3/zoom2/debug_board.c
...
> +static void zoom2_debug_board_detect (void)
> +{
> +	unsigned int val;
> +	/*
> +	 * GPIO to query for debug board
> +	 * 158 db board query, bank 5, index 30
> +	 */
> +	gpio_t *gpio5_base = (gpio_t *) OMAP34XX_GPIO5_BASE;
> +
> +	val = __raw_readl (&gpio5_base->datain);

Is there any special reason why you use __raw_readl() instead of just 
readl() here? Looking at ARM's io.h, they seem to map to the same macro?

Best regards

Dirk