Hi Maning,
Just an FYI to the great mkgmap devs. :) This feedback came from someone using my OSM-PH garmin maps.
In Garmin Nuvi 855 when you click the Address icon to search an address, the popup message "No map data found." will immediately appear. In other Garmin units like 205w and 265w you can enter the city, street and house number.
Would it work if you generated the map with mkgmap --index and transferred it from MapSource to the device? As far as I understand, this would create a working MDR section in the gmapsupp.img. It is not yet possible to generate a "device MDR" directly from mkgmap. Steve just wrote about this a couple of days ago, asking for help. http://wiki.openstreetmap.org/wiki/OSM_Map_On_Garmin/MDR_Subfile_Format (Sorry, the search works on my Edge 705, I am not going to invest time in it.) Best regards, Marko