From: Dan Malek <dan@embeddededge.com>
To: Wolfgang Denk <wd@denx.de>
Cc: Robin Gilks <robin.gilks@tait.co.nz>,
linuxppc mail list <linuxppc-embedded@lists.linuxppc.org>
Subject: Re: PATCH: Another mpc8xx watchdog driver !!
Date: Tue, 06 Jan 2004 19:11:20 -0500 [thread overview]
Message-ID: <3FFB4EA8.20809@embeddededge.com> (raw)
In-Reply-To: 20040106233539.63641C12DD@atlas.denx.de
> In message <3FFB450D.7060405@tait.co.nz> you wrote:
>
>>>Do you really mean RTC here???
>>
>>Yes - the 866 and derivatives (859 etc) do NOT have a Real Time Clock
>>block. This means that hooking the RTC interrupt to 'kick the dog' is
>>rather difficult :-))
Why would you want to do that? Not a very effective watchdog
timer. Even in the most hopelessly crashed system the RTC or other
timer interrupts usually continue to operate. An effective watchdog
needs to be managed throughout the whole boot process and handed off
along the way to some application, such that any system error will
cause the application to fail to kick the timer.
Good luck :-)
-- Dan
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2004-01-07 0:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <3FFB450D.7060405@tait.co.nz>
2004-01-06 23:35 ` PATCH: Another mpc8xx watchdog driver !! Wolfgang Denk
2004-01-07 0:03 ` Robin Gilks
2004-01-07 0:11 ` Dan Malek [this message]
2004-01-06 22:28 Robin Gilks
2004-01-06 23:06 ` Wolfgang Denk
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