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From: Sascha Hauer <s.hauer@pengutronix.de>
To: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Cc: barebox@lists.infradead.org
Subject: Re: [PATCH 7/9] ARM: move exception vectors away from start of binary
Date: Mon, 2 Jan 2012 15:13:45 +0100	[thread overview]
Message-ID: <20120102141345.GB5446@pengutronix.de> (raw)
In-Reply-To: <20120101043717.GC945@game.jcrosoft.org>

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@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"
		".endr\n"

we could do this:

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

Sascha

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  reply	other threads:[~2012-01-02 14:13 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-17 14:52 Thumb-2 support Sascha Hauer
2011-12-17 14:52 ` [PATCH 1/9] ARM i.MX5: prepare to add a imx51_lowlevel_init Sascha Hauer
2011-12-18 14:03   ` Eric Bénard
2011-12-19 10:18   ` Sascha Hauer
2011-12-17 14:52 ` [PATCH 2/9] ARM i.MX51: implement " Sascha Hauer
2011-12-17 14:52 ` [PATCH 3/9] ARM i.MX51 babbage: use generic lowlevel init function Sascha Hauer
2011-12-17 14:52 ` [PATCH 4/9] ARM eukrea i.MX51: use generic lowlevel init Sascha Hauer
2011-12-17 14:52 ` [PATCH 5/9] ARM: update string functions from Linux Kernel Sascha Hauer
2011-12-17 14:52 ` [PATCH 6/9] ARM cache-armv7: use thumb-2 instructions where necessary Sascha Hauer
2011-12-17 14:52 ` [PATCH 7/9] ARM: move exception vectors away from start of binary Sascha Hauer
2011-12-18 23:43   ` Peter Korsgaard
2011-12-20 14:07   ` Jean-Christophe PLAGNIOL-VILLARD
2011-12-21 10:09     ` Sascha Hauer
2012-01-01  4:37   ` Jean-Christophe PLAGNIOL-VILLARD
2012-01-02 14:13     ` Sascha Hauer [this message]
2012-01-02 15:09       ` Jean-Christophe PLAGNIOL-VILLARD
2012-01-23 12:07         ` Sascha Hauer
2012-01-24  4:39           ` Jean-Christophe PLAGNIOL-VILLARD
2011-12-17 14:52 ` [PATCH 8/9] ARM: get runtime offset of board_init_lowlevel_return by using separate section Sascha Hauer
2011-12-17 14:52 ` [PATCH 9/9] ARM: Allow to compile in thumb-2 mode Sascha Hauer

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