Nxp Semiconductors UM10237 用户手册

UM10237_2

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the address mirror bit is set in the EMCControl register during POR, see 

Therefore, the user code residing in the external boot memory must be linked to execute 
from address location 0x8000 0000 (EMC bank 0 address). 

Remark: The external boot option is supported only for flashless devices LPC2460 and 
LPC2470.