From: Clemens Koller <clemens.koller@anagramm•de>
To: Ansari <ma.harounansari@gdatech•co.in>
Cc: linuxppc-embedded@ozlabs•org
Subject: Re: Reboot Command Makes kernel to hang (MPC8560)
Date: Tue, 31 Jul 2007 13:44:05 +0200 [thread overview]
Message-ID: <46AF2085.1060603@anagramm.de> (raw)
In-Reply-To: <007001c7d341$d3ae29d0$9503a8c0@Ansari>
Hi, Ansari!
Ansari schrieb:
> Hi Kumar,
>
> First of all thanks for ur reply .
>
> Even i went through the linux source . And i have observe that the reboot
> command used to hard reset the core . I have few doubts can u please clarify
> me.
>
> 1. Is there any way to reset the full chip with out using any external
> signal (MPC8560) ? (like any register that can be used for reseting the
> processor)
I RTFM:
It should be the bits RST[1:0] in the Debug Control Register 0 (DBCR0).
I didn't find details how the external signals are affected: HRESET_REQ# and friends.
The HRESET_REQ# is usually fed back to the CPU's HRESET#.
So if the HRESET_REQ# gets asserted by writing to above registers it should really bring
down the CPU, it's internal as well as it's external components, which are usually
connected to a replication of that signal.
However the existence of cpm2_reset() and a qe_reset() (QuiccEngine?)
in the code tells me that the above expectations could be wrong.
Would be nice to have that verified by some hardware guys from freescale...
> 2. Even same reboot command works fine for MPC8540 Processor ?.
...because it doesn't have a cpm ?
> 3. what are the factors that makes ramdisk hangs . When its uncompressing ?
Well, side effects ?
Regards,
--
Clemens Koller
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next prev parent reply other threads:[~2007-07-31 11:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-26 6:55 Reboot Command Makes kernel to hang (MPC8560) Ansari
2007-07-26 19:51 ` Kumar Gala
2007-07-31 7:10 ` Ansari
2007-07-31 11:44 ` Clemens Koller [this message]
2007-07-31 14:11 ` Kumar Gala
2007-08-02 6:48 ` Ansari
2007-08-02 13:36 ` Kumar Gala
2007-08-02 18:29 ` Clemens Koller
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