bl_config.h里面有一个是否需要更新bootload的配置，如果不开启的话，bootload区是被保护的。//*****************************************************************************
//
// Enables updates to the boot loader. Updating the boot loader is an unsafe
// operation since it is not fully fault tolerant (losing power to the device
// part way though could result in the boot loader no longer being present in
// flash).
//
// Depends on: None
// Exclusive of: None
// Requires: None
//
//*****************************************************************************
//#define ENABLE_BL_UPDATE |
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