Lpc2000

Skulchak,
     The valid code "signature" at 0x14 is merely the two's complement
of the sum of the vector table.  That way when the checksum for the
whole vector table is 0x00 for valid flash code.  This is checked by
the bootloader automatically.  In your case the signature at 0x14 is
generated autmatically by the Nohau debugger.  You don't need to worry
about it.  
In Seehau, under Config/Emulator/Misc Setup, make sure the "remap
after reset" and "Flash written as RAM....." are unchecked to run from
flash.  You will also have to use/modify your IAR linker file to link
the code to flash.

Hope this helps. 

Richard


--- In lpc2100@yahoogroups.com, "skulchak" <skulchak@y...> wrote:
> Hello group,
> 
> I am trying to come up with a simple power up sequence
> for my application using IAR. So that I could just FLASH
> application into the part, and run it from RESET. I am
> using NOHAU J-TAG loader.
> 
> I just read in the manual "Criterion for the valid user
> code". I am not sure if there is a mechanism in IAR or
> any other existing compiler for LPC2100 to create a valid
> checksum block around interrupt vectors. I could write
> a utility to update target binary file and insert a
> proper checksum there, or write vectors in assembly and use 
> jumps to the fixed secondary jump-table to keep values in 
> the interrupt area constant, hence, predictable for the local
> checksum.
> 
> I just can't believe that things need to be that complex to
> power up an embedded processor and pass control to main().
> 
> I would highly appreciate any suggestions how to create
> a FLASH-based power up sequence.
> 
> Regards,
> 
> Skulchak.