Lpc2000

Hi All-

I'm currently experiencing a very frustrating issue with the LPC2138 
bootloader. I can successfully and reliably use the Philips flash 
utility to download an image to a blank LPC2138 once and only once. 
After that, the flash utility is never able to communicate with the 
LPC2138.

I have been monitoring the recent bootloader thread that was 
resolved by manipulating the watchdog overflow flag which, if set, 
will cause the bootloader reques to be ignored. Unfortunately, this 
is not the same problem I am having because I'm never enabling the 
watchdog.

I've been working with an evaluation board for 6 months now so I 
felt confident I understood the processor because I never had this 
issue. Now that I am bringing up custom hardware, I removed 
everything from the board except the processor, JTAG, and power 
supplies. I thought perhaps my code was inadvertently configuring an 
I/O pin in conflict, so I modified the application code to simply 
sit in a loop after disabling interrupts and other basic init steps.

The signals to the processor are exactly what I would expect:
1.) The reset line and P0.14 are pulled low by the Philips Flash 
application at t=0.
2.) The P0.14 line is held low for about 470mS before being 
released, and the reset is held low for about 820mS before being 
released.
3.) After these transitions, the processor sees the 0x3F being 
transmitted by the flash utility.

So, as far as I can tell, everything is ocuring correctly, but I am 
unable to access the bootloader after the first initial image 
download. I was initially swapping processors, but each one behaves 
the same way.

Thanks-
Tim