因为前面有8条跳转语句每条语句是4字节,如下:
b ResetHandler ;地址为0x00000000
b HandlerUndef ;handler for Undefined mode ;0x00000004
b HandlerSWI ;handler for SWI interrupt
b HandlerPabort ;handler for PAbort
b HandlerDabort ;handler for DAbort
b . ;reserved
b HandlerIRQ ;handler for IRQ interrupt
b HandlerFIQ ;handler for FIQ interrupt ;0x0000001c
;@0x20 ;下面一条语句的地址为0x00000020
b EnterPWDN ; Must be @0x20.