COM_RBR            40 bsp/boot/ppc/prep/debug.c #define COM_RBR		(COM_BASE + 0x00)	/* receive buffer register */
COM_RBR            42 bsp/boot/x86/pc/debug.c #define COM_RBR		(COM_BASE + 0x00)	/* receive buffer register */
COM_RBR            50 bsp/drv/dev/serial/ns16550.c #define COM_RBR		(COM_BASE + 0x00)	/* receive buffer register */