[U-Boot] [PATCH] arm: vf610: fix boot from SD-card

[Bill Pringlemeir <bpringlemeir@nbsps.com>]

On  8 Jan 2015, stefan at agner.ch wrote:

> Boot from SD-card (and probably also from NAND) was broken since
> commit d6d07a9bec ("arm: vf610: add NAND support for vf610twr").
> It looks like the increased size of U-Boot lead to a situation
> where the boot ROM overwrote its own stack/heap while loading
> U-Boot from the SD-card to the SRAM. However, U-Boot worked fine
> when loaded through USB serial loader directly into SRAM. It
> looks like loading from SD-card uses other stack/heap location
> then the serial loader (or maybe no stack or heap at all).
> This fix moves U-Boot to gfxRAM, which is 512kB in size and is not
> used by the boot ROM nor the SD-card loader of it.
>
> Signed-off-by: Stefan Agner <stefan@agner.ch>
> ---
> We use U-Boot from gfxRAM on Vybrid since quite a while for the
> Colibri VF50/VF61 modules in our downstream U-Boot branch. Hence
> this is quite well tested.
>
> Just today I discovered that this is broken on the Tower module.
> Back then, when I made the offending change, I only tested on the
> Tower board using the serial loader, since I thought the behaviour
> should be exactly the same. But now, I know better... :-)
>
> If still possible, it would be great to get this into v2015.01...
>
> include/configs/vf610twr.h | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/include/configs/vf610twr.h b/include/configs/vf610twr.h
> index 6fd0b17..bd79e81 100644
> --- a/include/configs/vf610twr.h
> +++ b/include/configs/vf610twr.h
> @@ -125,7 +125,10 @@
> #define CONFIG_BOOTDELAY		3
>
> #define CONFIG_LOADADDR			0x82000000
> -#define CONFIG_SYS_TEXT_BASE		0x3f008000
> +
> +/* We boot from the gfxRAM area of the OCRAM. */
> +#define CONFIG_SYS_TEXT_BASE		0x3f408000
> +#define CONFIG_BOARD_SIZE_LIMIT		524288
>
> #define CONFIG_EXTRA_ENV_SETTINGS \
> 	"script=boot.scr\0" \

Acked-by: Bill Pringlemeir <bpringlemeir@nbsps.com>

See also:
 http://lists.denx.de/pipermail/u-boot/2014-December/197641.html

It seems since v2014.04 u-boot on the Vybrid Tower SD card has not
booted.  Most users will probably boot this way.

 https://community.freescale.com/docs/DOC-95248

Thanks,
Bill Pringlemeir.