How to verify Flash programming if Boot ROM is mapped to address 0?

lpcware — Wed, 15 Jun 2016 17:30:23 GMT

Content originally posted in LPCWare by giusloq on Mon Dec 14 02:04:42 MST 2015
I'm trying to create a DOS script that programs and verifies Flash memory of LPC1778 device. I'm using J-Link debugger probe that includes a simple command-line application that writes and reads memory of the connected device.

The verify process failed immediately at address 0. I think because I verify starting from address 0, but after reset Boot ROM (or a part of it) is mapped to address 0. If I understood correcly, the size of the Boot ROM remapped to address 0 after reset is 0x3FF (1024 bytes).

First question: does this mean the user application code can't use those first 1024 bytes?

Second question: how to implement a correct verify procedure? In this scenario, I think I need to verify starting from address 0x400, ignoring address range 0x000-0x3FF. Correct?

Re: How to verify Flash programming if Boot ROM is mapped to address 0?

lpcware — Wed, 15 Jun 2016 17:30:24 GMT

Content originally posted in LPCWare by MikeSimmonds on Mon Dec 14 08:34:30 MST 2015
See section 38.8 in the UM (rev 3.1)

Your verification process should write a 1 to the MEMMAP register at 0x400FC040 before reading the lower part of flash for compare.
NB: use a word access.
Do it anyway, it can't do any harm.

ISTR that only 128 bytes are overlayed, but that is mostly irrelevant as any amount will cause a mismatch.

You can't move you code higher as your app's vectors MUST be placed at 0 for correct operation (and Boot ROM's valid code check).

Cheers, Mike.

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How to verify Flash programming if Boot ROM is mapped to address 0?

Re: How to verify Flash programming if Boot ROM is mapped to address 0?