mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: Sascha Hauer <s.hauer@pengutronix.de>
To: Orjan Friberg <of@flatfrog.com>
Cc: barebox@lists.infradead.org
Subject: Re: OMAP 3530 arch_shutdown "undefined instruction"
Date: Thu, 27 May 2010 11:31:32 +0200	[thread overview]
Message-ID: <20100527093132.GC23664@pengutronix.de> (raw)
In-Reply-To: <4BFD34A9.6030008@flatfrog.com>

Hi Orjan,

On Wed, May 26, 2010 at 04:48:09PM +0200, Orjan Friberg wrote:
> Hi,
>
> I'm trying to use barebox as both the 2nd and 3rd stage bootloader (boot  
> ROM being the 1st) on an OMAP 3530 (BeagleBoard).
>
> Every go <address> command in the 2nd stage, regardless of whether I  
> have uploaded anything to this address or not, is met with a
>
> go 0x80e80000
> ## Starting application at 0x80E80000 ...
> undefined instruction
> pc : [<40208b00>]    lr : [<40203a34>]
> sp : 87bff21c  ip : 00000028  fp : 87bffa4d
> r10: 00000000  r9 : 00000000  r8 : 87bff64d
> r7 : 87bffe44  r6 : 00000002  r5 : 4020b1e8  r4 : 80e80000
> r3 : 00000000  r2 : 00000001  r1 : 0000843f  r0 : 4020ae50
> Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
> Resetting CPU ...
>
> which is in arch_shutdown:
>
> 40208af8 <arch_shutdown>:
> 40208af8:       e3a03000        mov     r3, #0  ; 0x0
> 40208afc:       ee073f17        mcr     15, 0, r3, cr7, cr7, {0}
> 40208b00:       e12fff1e        bx      lr
>
> This is from the 2010.05.0 snapshot, though it seems that code hasn't  
> changed in the latest trunk (arch/arm/cpu/cpu.c):
>
> 	/* flush I/D-cache */
> 	i = 0;
> 	asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i));
>
>

Seems this does not work on Cortex Processors. Can you try replacing
this with the following please:

	asm volatile (
		"bl __mmu_cache_flush;"
		"bl __mmu_cache_off;"
		:
		:
		: "r0", "r1", "r2", "r3", "r6", "r10", "r12", "cc", "memory"
	);

This should select the right cache flush functions.

Sascha

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

  reply	other threads:[~2010-05-27  9:31 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-05-26 14:48 Orjan Friberg
2010-05-27  9:31 ` Sascha Hauer [this message]
2010-05-27 11:03   ` Orjan Friberg
2010-06-08  8:02 Luca Ceresoli
2010-06-10 12:22 ` Sascha Hauer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20100527093132.GC23664@pengutronix.de \
    --to=s.hauer@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    --cc=of@flatfrog.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox