Traditionally U-Boot and barebox have the exception vectors at
the start of the binary. There is no real reason in doing so,
because in the majority of cases this data will not be at 0x0
where it could be used as vectors directly anyway.
This patch puts the vectors into a separate linker section and
defines an head function which is placed at the start of the
image instead. Putting this in a separate function also has
the advantage that it can be placed at the start of images
which require an additional header like several Freescale i.MX
images. As the head function contains the barebox arm magic
those images can now also be detected as barebox images.

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

Updated mx53 ddr3 script in order to align with the latest Freescale version from July 8, 2011:

-change ESDREF[REF_SEL]=01 (for 32KHz), from incorrect setting of 00 (64KHz)

-change DDR3 MR0 write to "setmem /32 0x63fd901c = 0x052080b0" from "0x092080b0".

This changes write recovery from 8 clocks to 6 clocks(in line with ESDCFG1[tWR])

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>