RE: [ECOS] Simple Redboot Q's

[Gary Thomas <gary at mlbassoc dot com>]

On Tue, 2005-07-26 at 14:19 +0100, Matt Sartori wrote:
> Exec seems quite closely tied to linux (eg. When I enable the
> CYGBLD_BUILD_REDBOOT_WITH_EXEC it actually fails with some error in
> redboot_linux_exec.c). Can I run anything with Redboot using exec or is
> it looking for some kind of linux kernel image etc. ? 
> 

exec could be used to run most any image, but it is really designed
to run Linux.  In most cases (remember 'exec' is platform/architecture
specific), the command assumes certain operations before starting the
code: turning off the MMU, moving the program to a specific location
(on some architectures only), setting up some data structures to pass
to Linux, etc.  These are typically only useful if what you are running
is Linux (possibly other operating systems as well, e.g. FreeBSD)

> -----Original Message-----
> From: Andrew Lunn [mailto:andrew@lunn.ch] 
> Sent: 26 July 2005 12:05
> To: Matt Sartori
> Cc: ecos-discuss@ecos.sourceware.org
> Subject: Re: [ECOS] Simple Redboot Q's
> 
> 
> On Tue, Jul 26, 2005 at 11:16:15AM +0100, Matt Sartori wrote:
> > Does an application that is loaded and run by Redboot have to be 
> > linked against the eCos libraries?
> 
> No. eg your application could be Linux, which will simply take complete
> control of the hardware.
> 
> > What provisions would be necessary to make this work (e.g.. you 
> > obviously don't want your app to overwrite the rom area Redboot sits 
> > in) and are there any examples of this out there?
> 
> Look at how Linux is booted using RedBoot.
> 
>         Andrew
> 
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-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


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