Re: [OpenOCD-devel] STM32 - how to write to OTP memory with openocd

[Andreas F. <and...@gm...>]

On Thu, Jul 19, 2012 at 6:09 PM, Laurent Charpentier
<lau...@ya...> wrote:
> Hi Spencer,
>
>> > If you fancy having a go then have a look at the stm32ff1x
>> > driver as a reference.
>> Yes sure I can add this feature to the project.
>>
>> Should I consider the OTP bank as an additional bank (bank #12 for
>> stm32f2)?
>
> I found out that I can't simply add a new OTP sector to the existing flash bank: a flash bank is defined as a set of successive sectors (it is not the case for the stm32f2 OTP).

I think from a user's perspective it's most suited as a separate
(small) flash bank, but I haven't read up on how the write procedure
differs from the regular flash bank. I think it would be good to be
able to program a single file (elf, or discontinuous hex) into both
areas in one step, rather that to have to issue separate flash writes
or needing a completely different set of commands.

To avoid ruining chips by mistake, I'd think it would be best to have
to explicitly write-enable the OTP area via a special command and
ignore writes while printing a warning unless it's been enabled. I
mean in addition to the hardware unlock procedure that I assume will
have to be made as part of the flash write routine.

Like
stm32f2x otp enable
flash write flash_and_otp.elf
stm32f2x otp disable

/Andreas