哼，仔细读一下 User Manual , GD32F450 这个货很高级的！只有你想不到
1.5.1. Configuration register 0 (SYSCFG_CFG0)
11:10 EXMC_SWP[1:0] EXMC memory mapping swap
01: SDRAM Bank 0 and Bank 1 are swapped with NAND Bank 1 and PC CARD.
Then, SDRAM Bank 0 and Bank 1 are mapped at the address region from 0x8000 0000 to 0x9FFF FFFF,
NAND Bank 1 is mapped at the address from 0xC000 0000 to 0xCFFF FFFF,
and PC CARD is mapped at the address
from 0xD000 0000 to 0xDFFF FFFF.
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