EZPort FlexRAM buffer 16 bytes long?

codetrooper — Mon, 25 Jun 2012 21:31:39 GMT

I had some difficulties programming the internal flash via EZPort. The program always went into boot-exception. I noticed that the problem occurred in ROMcopy.c: __copy_rom_sections_to_ram() during initialization.

Looking at the flash with the memory browser shows that the last 4 zero-bytes are missing which are checked in the mentioned function.

I played a bit around with the flashing machanism and figured out that the last chunk I write is 708 bytes long. Enlarging this value to 720 (which is a multiple of 16 bytes) works. A value between 708 and 716 results in no or strange effects.

The documenation mentioned that the size of the data must be a multiple of 8 bytes due to the buffering in the FlexRAM.

Is the documenation wrong at this point. I really have to understand this issue so I can be sure future programmings will work.

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codetrooper — Wed, 01 Aug 2012 14:07:05 GMT

My question has been answered by freescale in the meantime.

The data must be a multiple of 16bytes indeed.

The documentation is going to be updated soon.

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EZPort FlexRAM buffer 16 bytes long?

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