Re: A89: Quick Question

To: assembly-89@lists.ticalc.org
Subject: Re: A89: Quick Question
From: Jean Canazzi <jcanazzi@cybercable.fr>
Date: Fri, 18 Aug 2000 23:20:55 +0200
References: <010301c008d9$a954b440$eb02e0c7@Pnoveck> <4.3.2.7.0.20000818170908.00ab3a50@pop3.ti-files.org>
Reply-To: assembly-89@lists.ticalc.org

Rob Smith wrote:
> 
> Isn't it always true, that you can access the boot loader, no matter what
> happens to the rom? or is the boot loader part of the rom in a area we can
> not access?

The boot loader is located in the first 64k of the flash memory, and
this area is physically write-protected (the pin for write access is not
welded). It is impossible to overwrite it only with a software
operation. Now, the question is : is it possible to create a malicious
(or let's say bugged) program that will prevent the boot loader from
being launched after a complete reinitialization ? I don't think so, I
believe that if you remove your batteries for a few minutes, the entire
ram will be cleared, and the very first thing to be run will be the boot
sector.

References:

Re: A89: Re: Re: Re: Re: CORRECTION: Shift+ON

From: "Scott Noveck" <noveck@pluto.njcc.com>

A89: Quick Question

From: Rob Smith <kormoc@ti-files.org>