stm32: get small filesystem working on NUCLEO_L432KC

[dpgeorge]

The filesystem is 26k in size.

[mindforger]

tested and working

made one addition on my own
froze the sdcard.py
resized the FS to 25k as i was overlapping by 800ish bytes with the frozen sdcard.py
tested on SPI 1 and 3, works flawless, Board Pin A7 is not working as chip select, the whole board freezes then

great job

PS the remaining space is enough to fit in a boot.py to mount the sd permanetly

[dpgeorge]

resized the FS to 25k

That probably won't work because the page erase size is 2k, so the filesystem must be a multiple of 2k.

Board Pin A7 is not working as chip select

PA7 should be a MOSI pin.

[dpgeorge]

I merged one of the commits here in a974f2d and rebased and force pushed the remaining one.

[mindforger]

hm ... now something is broken again, just did a hard reset origin/master and now i won't get a FS anymore

HEAD ist jetzt bei 8402c26 stm32/powerctrl: Enable EIWUP to ensure RTC wakes device from standby.

edit: okay that was a total failure, now all the changes to the ld file are gone .. i am confused sorry
made a copy, thatis still working ... i think i used the wrong branch here

[dpgeorge]

There is still one commit on this branch which is not yet in master. The reason I don't want to merge this (yet) is because this board is a good candidate for using littlefs by default (since it doesn't have USB, doesn't need to use FAT). Soon littlefs v2 will be integrated and this board will use it, and likely have more free space on its filesystem.

[mindforger]

Ah, okay. Will stay on my modified branch then. But will i be able to read a sdcard when i freeze in the sdcard.py? I still did something to my local code but i dont know how to diff in console XD
If you have an advice on how i can push my local version to github i could diff it online

[cdwilson]

Soon littlefs v2 will be integrated and this board will use it

@dpgeorge is there any activity on this now that littlefs V2 is released?

[dpgeorge]

Commit 3786592 made progress on this, and now this PR (which has been updated) is very minimal.

See also #7123 which does what's done here in a different way.

[dpgeorge]

Fixed filesystem partition offset, and tested on a board.