Lpc2000

My code has a classic startup written in assembly code that run the C 
main() function.
Into the main() function i have:

#ifdef RAM_RUN
	// Per la compilazione in RAM è necessario reimpostare
	// anche la zona degli interrupt (se usati...)
	SCB_MEMMAP = 2;
#endif
	VIC_Init();
	initTimer0(1000); // set up the timer0
	enableIRQ();
	while(1) .....

If i take a look into the main.lss i see:

40000000 <startup>:
.section .startup, "ax"
	.code 32
	.align 0

	b     _start
40000000:	ea000083 	b	40000214 <start>
	ldr   pc, _undf	
40000004:	e59ff014 	ldr	pc, [pc, #20]	; 40000020 
<_undf>
	ldr   pc, _swi
40000008:	e59ff014 	ldr	pc, [pc, #20]	; 40000024 
<_swi>
	ldr   pc, _pabt
4000000c:	e59ff014 	ldr	pc, [pc, #20]	; 40000028 
<_pabt>
	ldr   pc, _dabt	
40000010:	e59ff014 	ldr	pc, [pc, #20]	; 4000002c 
<_dabt>
	nop
40000014:	e1a00000 	nop			(mov r0,r0)

	ldr   pc, [pc,#-0xFF0]	

So I think this it is correcty mapped ...
My dubt is: when the interrupt is fired, the flow should go to 
0x4000.0018 address to read the IRQ VIC address (0xFFFF.F030)
containing the service routine. 
When the vectors are based on 0x0 (Flash) then pc,#-0xFF0 => 
0xFFFF.F030 but when the vectors are based on 0x4000.000 (RAM) the 
difference is equal to 0x3FFF.F030 that's incorrect !! 

Thanks again !!



--- In lpc2000@yahoogroups.com, 3gpabko <zdravko_k_d@...> wrote:
>
> When you have set MEMMAP=2 and an exception occurs the
> ARM core will fetch from addresses 0x40000000 -
> 0x4000001C  instead of 0x00000000 - 0x0000001C. That's
> why you have to be sure that before this happens you
> already have at address 0x40000000 a correct Exception
> Vectors Table.
> With my tools I am doing this with manually written
> code in the startup file(reset handler) and linker
> scripts.
> 
> Regards
> Zdravko  
> 
> --- stefano_m_a <stefano_mora@...> wrote:
> 
> > MEMMAP=2 is not enought ??
> > 
> > Thanks !