[U-Boot] [PATCH] fw_env.h: include autoconf.h

[Tom Rini <trini@konsulko.com>]

On Tue, Apr 14, 2015 at 09:50:47PM +0200, Marcel Ziswiler wrote:

> From: Max Krummenacher <max.krummenacher@toradex.com>
> 
> Without this, when CONFIG_ENV_VARS_UBOOT_CONFIG is active we get
> a compile time error when doing 'make env'.
> In file included from tools/env/fw_env.c:117:0:
> include/env_default.h:110:11: error: expected ?}? before ?CONFIG_SYS_ARCH?
> 
> When building U-Boot this is included indirectly by the compiler switch
> -include
> /home/trdx/git.toradex.com/u-boot-2014.10-toradex/include/linux/kconfig.h
> 
> Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
> Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
> ---
> This is an issue on all tegra boards due CONFIG_ENV_VARS_UBOOT_CONFIG
> being defined in the tegra-common.h header file.
> 
> I already did reported this once last November but did not get any
> useful insights back then:

Ug.  I'm cc'ing a few distro people since this makes it further clear
that by whatever name a distro packages fw_setenv/fw_getenv these are
really machine (to the extent U-Boot is built) specific applications due
to the need to include a copy of the default environment so that we
can support making sure that variables that aren't supposed to be
overwritten are not overwritten (see the fw_getdefenv call in
tools/env/fw_env.c::fw_env_write).

I'll let Masahiro comment on if this is the best way to fix the compile
problem.

-- 
Tom
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