How did Nintendo implement the SDHC in 4.0?

How did Nintendo implement the SDHC in 4.0?

Wii software uses the IOS for SD-cards, right?
Did Nintendo abstract the SDHC support so far, that all old applications the used SD-cards can use SDHC?
Did they update older IOS versions?
Or is the SDHC support part of the (new) applications, like homebrew did for some time?

(example: can SSBBrawl or Excite Trucks use SDHC cards?)

I'm pretty sure they updated older IOS versions with SDHC support

The savefiles for games are loaded just after the title of the disc or channel being loaded is recognized. It uses universally accessible system menu/IOS code at that point in time.

I am not talking about savegames. I am talking about games, that use the SD-Cards on their own. SSBBrawl can store replays and screenshots and custom levels on SD-Cards. Excite Trucks can playback MP3s from SD-Cards.

this may be a wild guess... the were probably fiddling with HBC.

just a wild shot!

"fiddling"? (I did not find that word in my dictionary :D)
with the HBC?

what are you trying to say?

I found this on hackmii:

Quote
Marcan
Most of the Nintendo driver is on the PPC side (this is why we were able to mostly get SDHC working, with a few hacks, and no IOS mods).

I remeber that svpe made a detailed blog post about how he created SDHC support somewhere. I'll post the link if I can find it.

[svenpeter.blogspot.com]