[PATCH 7/9] ARM: move exception vectors away from start of binary

Sascha Hauer s.hauer at pengutronix.de
Mon Jan 2 09:13:45 EST 2012

On Sun, Jan 01, 2012 at 05:37:17AM +0100, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 15:52 Sat 17 Dec     , Sascha Hauer wrote:
> > 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 aas barebox images.
> > 
> > Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
> > ---
> I've to make it optionnal as on AT91 for boot we must have it at the bigeniing
> of the binary

Instead of this:

		"b reset\n"
		".rept 7\n"
		".word 0x0\n"

we could do this:

		"b reset\n"
		".rept 7\n"
		"1: b 1b\n"

This looks like a exception vector table for the at91 bootloader. BTW
I just looked at a at91 datasheet and at least on the at91sam9260 the
sixth vector should contain the image size to copy. So maybe this does
not work on at91 anyway?


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