Map base Umon image in internal SRAM of AM335x/BBB
Map base Umon image in internal SRAM of AM335x/BBB

The internal SRAM of the AM335x/BBB is 109KB.  First half is allocated to Umon code and
nonvolatile data while the second half is allocated to volatile data.

jrcatbagan/umon,jrcatbagan/umon,jrcatbagan/umon