Firebee memory map
==================

		Virt. Start	Virt. End	Phys. Start	Phys. End
ST-RAM		0x00000000	0x00dfffff	0x60000000	0x60dfffff
TOS		0x00e00000	0x00efffff	0x00e00000	0x00efffff
ST I/O area	0x00f00000	0x01000000	0xfff00000	0xffffffff
TT-RAM		0x01000000	0x20ffffff	0x00000000	0x1fffffff