Add a single bld.inf to collect all the little ones, and a packagde_definition.xml file which refers to it
<?xml version="1.0" encoding="UTF-8"?>
<SystemDefinition schema="3.0.0">
<package id="beagleboard" name="Beagle Board" levels="hw-if">
<collection id="omap3530" name="OMAP 3530" level="hw-if">
<component id="beagleboard" name="Beagle Board baseport" introduced="symbian^3" purpose="optional">
<unit bldFile="omap3530" mrp="omap3530/base_beagle.mrp"/>
</component>
</collection>
</package>
</SystemDefinition>