I have updated the UI board soldering guide with this information, but i will post here as well.
It is important to check what type of LCD you have. The HY28 LCD so far has three versions – serial only, parallel only and the latest model – dual support (interface select via 0 ohm resistors). The first two are named the same (HY28A), the difference is that the interface that is not in use is not connected on top layer. The dual version is named HY28B, the problem with this one is that the SPI bus is not on the same pins as the previous two versions and not compatible with the UI board revision 0.1 and 0.2. To make this work, before soldering, some traces cutting is needed. As far as the parallel interface, it is not supported in the mcHF firmware yet. On my ToDo list.
Fig1: LCD types(click for a larger view)