1. 根目录:
2. arch
3. arm
4. mach-footbridge
5. common.h

extern struct sys_timer footbridge_timer;
extern struct sys_timer isa_timer;

extern void isa_rtc_init(void);

extern void footbridge_map_io(void);
extern void footbridge_init_irq(void);

extern void isa_init_irq(unsigned int irq);