Alright, it's committed to SVN trunk now.
To build the compiler:
make buildbase OS_TARGET=embedded CPU_TARGET=arm SUBARCH=armv7em CROSSINSTALL=1
To install it:
make installbase OS_TARGET=embedded CPU_TARGET=arm SUBARCH=armv7em CROSSINSTALL=1 PREFIX=C:/wherever you want to install
To build a program:
fpc -Parm -Tembedded -Cparmv7em -Wpmk20dx256xxx7 program.pas