Depends. there are multiple kinds of SDHC.
The kernel I use on mine is this one: R4 SDHC Kernel upgrades to v1.34?2010-03-25?, english one to be more precise.
If you have a different SDHC (or a SDHCi) dunno if it will work.
I use the US version rom, using the V2 of this patch, nothing else...