...

I also got some compiler warnings with CFG_64BIT_LBA enabled.

For which board is this? Is it listed in the MAKEALL script? If not - why?

It is for a custom board. Havent gotten around to make a patch and submitting it yet. (8266 based) And as far as I know, noone else is using 64 bit LBA48 support yet. (and I can get by just fine witout it also, since my harddrive is only 250GB)