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Re: The basics

To: Andrew Lunn <andrew dot lunn at ascom dot ch>
Subject: Re: [ECOS] The basics
From: Jonathan Larmour <jlarmour at redhat dot com>
Date: Fri, 19 Oct 2001 18:11:26 +0100
Cc: Tim Michals <Tim dot Michals at cygnetinc dot com>,ecos-discuss at sources dot redhat dot com
Organization: Red Hat UK Ltd.
References: <63A6C537769693488EF351F5DB94668615B453@cyglew04.cygnetinc.com> <3BD0536A.79E24FFB@redhat.com> <20011019184044.D12722@biferten.ma.tech.ascom.ch>

Andrew Lunn wrote:
> 
> You can do field updates so long as you use redboot to do it. The
> application cannot update its self if you have redboot in ROM. With
> that situation there is a danger the application will jump into ROM
> because of an incoming ethernet packet etc. This causes a read from
> FLASH while its in write mode and a crash....
> 
> If you want the application to be able to update itself, you cannot
> have Redboot running in ROM. RAM is OK.

Or you can disable all interrupts, and make sure you don't call any
functions that would call into RedBoot (you have the source!).

Jifl
-- 
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