From: Jaap-Jan Boor <jjboor@aimsys.nl>
To: jgeissel@gmx.net
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: problem with watchdog/reboot MPC5200
Date: Thu, 20 Apr 2006 12:21:13 +0200 [thread overview]
Message-ID: <1145528473.13114.6.camel@linpc041.aimsys.nl> (raw)
In-Reply-To: <200604201146.01342.jgeissel@gmx.net>
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Arno,
I think your problem is related to Intel Strataflash specifics.
After a write to strataflash, it remains in status mode until another
read (or reset) command is issued. This means you don't get the flash
contents when reading it, but a status bit (e.g. 0x8080 at every spot).
So when the processor start executing after a reset, it's not reading
proper instructions.
You first need to e.g. write a reset cmd (0x5050) to it or connect
the processor's hardreset line to the flash device.
Jaap-Jan
On Thu, 2006-04-20 at 11:46 +0200, Arno Geissel wrote:
> Hello all,
>
> I have a custom board based on MPC5200 processor running
> the latest linuxppc_2_4_devel.
> Everything is working fine until a flash write access is performed
> using MTD. After this a (soft) reboot stucks in mpc5xxx_restart()
> where the watchdog timer is charged and linux waits with closed
> interrupts until the MPC performs the reset. Only power off helps
> in this situation.
> It seems to me like a hardware problem, because the freescale
> MPC5200lite reference board does not run into this.
> The main difference of the custom board to the reference board
> is, that it is using 16MB Intel Strada Flash instead of AMD flash,
> which has an erase block size of 128kB.
> Has anybody else experienced such behaviour?
>
> Arno Geissel
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded
>
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next prev parent reply other threads:[~2006-04-20 10:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-04-20 9:46 problem with watchdog/reboot MPC5200 Arno Geissel
2006-04-20 10:21 ` Jaap-Jan Boor [this message]
2006-04-20 11:34 ` Arno Geissel
-- strict thread matches above, loose matches on Subject: below --
2006-04-20 12:06 Joakim Tjernlund
2006-04-20 13:08 ` Arno Geissel
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