From: Wolfgang Denk <wd@denx.de>
To: "Debora Liu" <deboralh@fel.com.cn>
Cc: Linuxppc-embedded <Linuxppc-embedded@ozlabs.org>
Subject: Re: MPC8245 reboot
Date: Thu, 04 Aug 2005 12:18:41 +0200 [thread overview]
Message-ID: <20050804101841.6E06B352B36@atlas.denx.de> (raw)
In-Reply-To: Your message of "Thu, 04 Aug 2005 17:29:09 +0800." <20050804092525.15A4A67EBC@ozlabs.org>
In message <20050804092525.15A4A67EBC@ozlabs.org> you wrote:
>
> If do reboot board by jump address of uboot start address?
Bad idea. That address may not be mapped at all, or not at the right
physical address. Also, just jumping to a boot loader entry point
does not cause a hardware reset, so any devices that might be stuck
will remain stuck.
You should always try to cause a real reset; there are several
methods in use for this, like using a watchdog reset, causing a
machine check, etc. Just see existing code.
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
All these theories, diverse as they are, have two things in common:
they explain the observed facts, and they are completeley and utterly
wrong. - Terry Pratchett, _The Light Fantastic_
next prev parent reply other threads:[~2005-08-04 10:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-04 9:29 Re: MPC8245 reboot Debora Liu
2005-08-04 10:18 ` Wolfgang Denk [this message]
-- strict thread matches above, loose matches on Subject: below --
2005-08-03 5:40 Daniel Ann
2005-08-03 5:47 ` Kumar Gala
2005-08-03 6:40 ` Daniel Ann
2005-08-03 18:39 ` Mark A. Greer
2005-08-04 0:16 ` Daniel Ann
2005-08-04 0:26 ` Mark A. Greer
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