http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49868
--- Comment #5 from Eric Weddington <eric.weddington at atmel dot com> 2011-10-20 14:36:01 UTC --- Hi Johann, I would prefer if the name of the address space for program memory be named "__flash" so that way it is the same name as what the IAR compiler uses. Using the same name as the IAR compiler assists users who wish to migrate from the IAR to the GCC toolchains. Like so: + c_register_addr_space ("__flash", ADDR_SPACE_PGM);