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ARM interrupt handling

From: Davide Ciminaghi <ciminaghi at gnudd dot com>
To: ecos-discuss at ecos dot sourceware dot org
Date: Wed, 23 Jun 2004 16:37:36 +0200
Subject: [ECOS] ARM interrupt handling

Hi,

I have an ARM7 (Samsung s3c44b0x) target with no RAM at address 0 and,
as far as I know, no way to remap RAM at address 0. 

I'd like to run a RAM application "on top" of redboot (compiled with 
ROM startup).
There will also be a flash region with some data read/written by the
application and maybe initialized by redboot. 
The application needs interrupts and kernel support. 

The question is: how can Redboot invoke the application's irq handlers ?

My problem is that the application cannot overwrite the redboot vectors
because there's flash at address 0. Shall I modify the hal (vectors.S) 
adding some "trampoline" code with a jump to the application's handlers ?


Thanks and regards
Davide

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