Halftux, did you tried A1600 mmc's driver? This one could maybe work better on your cards, than muromec one ??
Sorry i only could try binaries... but here on A1200, my sdhc did work and the normals microSD's too...
I don't understand, but now, for looking at moto's code, i only try to read latest A1200e LATAM sourcecode!!
I see a /driver/i2c/a780_camera.c here in this tree? Don't know, i'm quite embarrased with compilations for A910 for now... and don't support spending too much time to on motorola's semi-released code, you know...

It's a little more clean and also compatible with quite all ezx device (except a1600, i guess... Of course with some usuals stuff forgotten but both for the happyness and the sadness of the reader

)