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RE: interrupt/virtual vectors confusion


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.
-----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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