Default environments: Do not continue when tftp failed ...

When we fail to download the kernel image (for example when the
user pressed ctrl-c) do not try to boot the image

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mx27ads: replace pcm038 with mx27ads ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

mx27ads: add missing include ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Net: Remove all hardcoded MAC addresses from default environments ...

While very convenient during debugging having MAC addresses in default
environments is a very bad idea. Stop it!

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

[memory layout]: streamline memory layout ...

Memory layout can now be specified via kconfig options. Two
possibilities exist: default layout means the layout is stack
/ malloc heap / U-Boot. The user can also specify fixed addresses
for each TEXT_BASE / stack / malloc heap.

[general] Move include/configs/* to board/*/config.h

[ARM] Remove CONFIG_ARCH_NUMBER from Kconfig system. Putting too many ...

values into kconfig which are not user configurable at all only
      encourages people to put even more stuff in there. This is not
      good because people tend to have board patches lying around and
      these patches won't apply regularly if they all change the same
      file (arch/arm/Kconfig)
      Instead, introduce a function armlinux_set_architecture() which
      everyone can call during board setup.
      Similarly introduce armlinux_set_bootparams() for the boot
      parameter pointer.

[i.MX27ads]: change uimage and rootfs name in environment

[i.MX27ads]: Move some not-so-important initialisations from assembler ...

to C-code

[i.MX]: Basic board support for the Freescale i.MX27 eval board