sh-netbsdcoff (for big endian) and shel-netbsdcoff (for little endian) should be good starting points. Build script is provided in sys/arch/sh3/conf/build-sh3.el and sys/arch/sh3/conf/build-sh3.eb. At least you need to update MACHINE and MACHINE_ARCH settings.
If you are outside of Japan, the best place you could contact is your local Hitachi office (like Hitachi US, Hitachi UK, whatever). They should have evaluation boards to sell to customers (since they would like to sell the SH3/4 chips), possibly with localized documents.
Among Japanese products, mmEye and Dreamcast are available outside of Japan.
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