Lpc2000

Thank you Richard. 

I did not know that Nohau compiles check
sum automatically. I assumed that I had to do it. 

Regards,

Skulchak.

--- In lpc2100@yahoogroups.com, "Richard" <richas@y...> wrote:
> 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.