[U-Boot] [PATCH v2 1/2] Tegra: fdt: Add/enhance sdhci (mmc) nodes for all T20 DT files

[Stephen Warren]

On 02/12/2013 03:41 AM, Thierry Reding wrote:
...
> So it turned out that I need to touch U-Boot anyway, so I decided
> to give this a spin. I noticed that overriding
> CONFIG_ARCH_DEVICE_TREE from the board configuration file doesn't
> work currently. What happens is that the autoconf.mk (which is
> derived from the board configuration) is included before the CPU
> config.mk which sets CONFIG_ARCH_DEVICE_TREE to tegra20 (or
> tegra30, tegra114). I came up with the attached patch to set the
> variable if not set previously (by the board configuration file).
> 
> Feel free to squash that in your patch series if you deem it a
> proper solution. I can also provide a proper separate patch if you
> prefer.

> diff --git a/arch/arm/cpu/armv7/tegra114/config.mk
> b/arch/arm/cpu/armv7/tegra114/config.mk

> -CONFIG_ARCH_DEVICE_TREE := tegra114 +CONFIG_ARCH_DEVICE_TREE ?=
> tegra114

That looks very odd. What value is CONFIG_ARCH_DEVICE_TREE before that
assignment, and why exactly is it wrong?