[ECOS] RE : [ECOS] RedBoot crash after do_go()

nprasad3@gmu.edu nprasad3@gmu.edu
Thu Jan 8 17:44:00 GMT 2004


David,

I had the same problem initially but that was because MMU was being enabled. You might not have the proper settings for the MMU or may want to try by disabling MMU totally.

Nirmal


----- Original Message -----
From: David POUTY <david.pouty@com2gether.net>
Date: Thursday, January 8, 2004 11:54 am
Subject: [ECOS] RE : [ECOS] RedBoot crash after do_go()

> The program works also well with GDB.
> I don't understand your explanation about the cache flush code ! I 
> thinkalso there's a problem with cache but I not familiar with it.
> 
> The stack is corrupt when 'sync' is executed, just after the 'mtmsr'
> instruction with the bit EE set.
> 
> David
> 
> 
> -----Message d'origine-----
> De : Gary Thomas [mailto:gary@mlbassoc.com] 
> Envoyé : mercredi 7 janvier 2004 18:38
> À : David POUTY
> Cc : eCos Discussion
> Objet : Re: [ECOS] RedBoot crash after do_go()
> 
> 
> On Wed, 2004-01-07 at 10:32, David POUTY wrote:
> > Hi,
> > 
> > I try to execute a simple application from RedBoot (MPC8xx 
> plateform).
> > When application is finished RedBoot display exit code, then 
> crash 
> > (enter in GDB mode). It seems that the stack is corrupted BEFORE 
> the 
> > application is executed.
> > 
> > During function hal_thread_load_context(), the macro 
> > 'hal_cpu_int_merge' is called to merge MSR register value with 
> the 
> > thread context previously initialized (HAL_THREAD_INT_CONTEXT). 
> The 
> > thread MSR value contains MSR_EE (to external enable irqs).
> > 
> > The stack is corrupted when MSR_EE bit is set to MSR in 
> > 'hal_cpu_int_merge' !! I use GDB with BDI probe. There's no 
> interrupt 
> > pending (SIPEND=0).
> 
> What happens if you execute the program via GDB, instead of RedBoot?
> 
> One thing to try (no guarantees) would be to disable the cache flush
> code that's in mbx.S (only when CYG_HAL_STARTUP_RAM is defined).  Look
> at how it's done on a newer platform, like the adder.
> 
> -- 
> Gary Thomas <gary@mlbassoc.com>
> MLB Associates
> 
> 
> -- 
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> http://sources.redhat.com/fom/ecosand search the list archive: 
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> 
> 
>


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