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In article <2.2.32.19971107115504.00694650.cygnus.crossgcc@mail.trintech.ie>, Roy Leonard <rleonard@trintech.com> wrote: If I understand "The Explicit reg vars" correctly, this allows you to access the internal registers which are addressed by name in assembler, eg. r1. If I understand this correctly, it doesn't allow you to specify a memory mapped register. Is this correct? If this allows you to specify a memory mapped register, how do I implement it? Either declare it as a pointer to an int and set its address or use a linker script to make sure it is defined at the correct address.