DSi SD card swaps do not call setSDcallback() or invalidate cache/FatFs structures

[asiekierka]

It is technically possible to swap out the SD card at runtime on DSi/3DS consoles (and on flash cartridges too, but this is not entirely fixable there), however this will currently lead to potential data corruption, as the cache and mounted filesystem are not invalidated/deinitialized.

This is probably a low priority issue.

[profi200]

My suggestion here would be to hook this up to some kind of event system. https://github.com/blocksds/libnds/blob/bb1e9e1510752fc1e402bcf5e34614aa54ab06f0/source/arm7/tmio.twl.c#L35

My only worry here is that delaying IRQ handler end even more is not good but since there is only 1 IRQ for status changes there is no other choice than to check for remove/insert status bits.

[asiekierka]

We already have the FIFO system, which should be sufficient; SDMMC_INSERT/REMOVE would be received by the ARM9 from the ARM7.