flashpage on STM32F4 CPU

[biboc]

Description

All other CPU on STM32 board have flashpage implemented, why not on STM32F4, what's missing?

Thanks,

[aabadie]

There was a tentative PR in #11681. Maybe @fjmolinas can describe what were the limitations and give some advice on how this could get in one day ?

[fjmolinas]

The main issue is that stm32f2 stm32f4 stm32f7 have sectors and not pages, these sectors are bigger than pages and more importantly do not have an uniform size. For one family they might be: 8kb, 8kb, 16kb, 32kb, 64kb.

My initial attempt #11681, faked pages within sectors, but it was a bit hacky, and I ended up not liking the solution at all. So currently flashpage needs to be adapted, or flashpage_raw converted to a flash_raw.

[biboc]

Ok thanks for your answer
Yes STM32F4 works with sector, so writting a page means erasing a sector then write the page, it is difficult to standardize the process with pages
Apart from erasing problem, the function flashpage_write works as expected without sync problem?

[fjmolinas]

Apart from erasing problem, the function flashpage_write works as expected without sync problem?

Are you referring to the close PR? Or to current code?

[biboc]

Close PR

[fjmolinas]

I don't remember the exact state the PR was in when closed, I think everything was working, but erasing was hacky.

[biboc]

Ok let's close this issue then