The following occurs with one of our map files.

Memory Map Plugin version 2.1.0 (af6cf)
ERROR: Build step failed with exception
java.lang.NumberFormatException: For input string: "ff000000"
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at net.praqma.jenkins.memorymap.util.HexUtils$HexifiableString.getIntegerValue(HexUtils.java:81)
at net.praqma.jenkins.memorymap.parser.gcc.GccMemoryMapParser$MemoryMapMemItemComparator.compare(GccMemoryMapParser.java:124)
at net.praqma.jenkins.memorymap.parser.gcc.GccMemoryMapParser$MemoryMapMemItemComparator.compare(GccMemoryMapParser.java:120)
...

Using Long or some other datatype might be a possible fix.