From mboxrd@z Thu Jan  1 00:00:00 1970
From: "james chen" <james_ch1@sina.com>
To: "Gary Thomas" <gthomas@cambridge.redhat.com>
Cc: <ecos-discuss@sources.redhat.com>
Subject: Re: [ECOS] Memory Layout
Date: Wed, 18 Apr 2001 18:05:00 -0000
Message-id: <000701c0c86c$ed2f5820$c408aa0a@inc.inventec>
References: <XFMail.20010418062421.gthomas@cambridge.redhat.com>
X-SW-Source: 2001-04/msg00182.html

>
> On 18-Apr-2001 james chen wrote:
> > Hello,
> >
> >        From memory layout, I find that Redboot( startup in ROM) and
> > Applications( startup in RAM ) both share the same memory address and
size.
> > When I use GDB debugging applications through redboot's gdb stub. Will
> > redboot's memory  be cracked by Applications? Thanks in advance!
>
> Memory used by RedBoot and "normal" applications do not overlap.  The MLT
> files imply that they do, but this is because RedBoot is just a ROM
> application and the MLT setup is to allow for any application to use all
> available resources.
>
> In general, RedBoot uses a chunk of low memory (128k is typical) and
> RAM based applications are set up to load just above that and use the
> remaining memory.
>
       After looking many ARM based platform in eCos. RAM based applications
leave different size memory( from 0x8000--0x20000), I think these memory is
used by RedBoot except vectors( sure?:-) ). Which size will I leave memory
for RedBoot, I am using my custom board based on ARM7TDMI.
       Another quesiton, when I release my applications and RedBoot will not
ship in. Will the memory used by redboot be lost( can't used by normal
applicationss). If then, how can I re-use it?

      Thanks in advance!

james chen