problem with watchdog/reboot MPC5200

[Jaap-Jan Boor]

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
> _______________________________________________
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> Linuxppc-embedded at ozlabs.org
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> 
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