after some playing around, i think i have a pretty good handle on the structure and usage of the boards.cfg file, except for what are apparently some oddities (not errors, just redundancies in some sense).
first, with lines like this:
apx4devkit arm arm926ejs apx4devkit bluegiga mxs apx4devkit m28evk arm arm926ejs m28evk denx mxs m28evk mx28evk arm arm926ejs mx28evk freescale mxs mx28evk
that last field would seem to be redundant, since the default value is just the name of the first (target) field, correct?
also odd is something like this:
mx31ads arm arm1136 - freescale mx31 mx31pdk arm arm1136 - freescale mx31 mx31pdk:NAND_U_BOOT
given that nothing else in the entire file refers to mx31pdk, it seems overly complicated for mx31pdk to refer to its own config file, only to add a preprocessor definition.
other than that, i might try to add an entry for a NAND-less beagle xm.
rday