Re: [ECOS] interrupt/virtual vectors confusion

[Andrew Lunn <andrew at lunn dot ch>]

On Tue, Aug 16, 2005 at 03:27:34PM +0100, Matt Sartori wrote:
> Eeek! But that would mean that Redboot can only properly work as a
> bootloader for Redboot "enabled" programs. It was my understanding (and
> basis for advocating it as a viable alternative to writing our own
> custom bootloader) that Redboot is able to run any application and only
> re-appear when the board is reset.

It can run non redboot aware applications. eg Linux completely takes
over the machine and never uses Redboot. You application can do the
same.  You have complete control of the hardware....

        Andrew


> -----Original Message-----
> From: Gary Thomas [mailto:gary@mlbassoc.com] 
> Sent: 16 August 2005 15:18
> To: Matt Sartori
> Cc: Andrew Lunn; eCos Discussion
> Subject: RE: [ECOS] interrupt/virtual vectors confusion
> 
> On Tue, 2005-08-16 at 15:06 +0100, Matt Sartori wrote:
> > >Is Blinky an eCos RAM program? If so it should of taken over the
> > >interrupt vectors from Redboot. Redboot should no longer be active
> > >unless blinky actually calls into Redboot via the virtual vectors.
> > 
> > Blinky is just a standalone program I decided to use as a test. The
> only
> > change I've made to it to make it run is to link it directly into free
> > ram so that I can run it after having loaded it from Redboot (with a
> > load -r -m ymodem -b 0x20005b68). 
> > The reason I know that Redboot is handling (or at least that Redboot
> > code is being called) the IRQ is that I put while(1){flash an led
> every
> > second} at the top of hal_IRQ_handler and that it gets stuck there
> when
> > I run Blinky.
> 
> Then, this is just as it should be :-)  Unless you make Blinky into an
> eCos program, which uses the HAL interrupt mechanisms, RedBoot is quite
> happily going to try and handle the interrupt, etc.
> 
> -- 
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
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