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怎么修改pci，bar的基地址？

露 曹
Expert 1011 points
Other Parts Discussed in Thread: AM5728

[    0.603396] pci 0000:00:00.0: BAR 0: assigned [mem 0x20100000-0x201fffff]    
[    0.603411] pci 0000:00:00.0: BAR 1: assigned [mem 0x20020000-0x2002ffff] 

在启动打印信息中看，bar0 只有1M的空间，我想assigned[mem 0x21000000-0x21ffffff] 即16M，怎么操作呢？几乎把内核关于pci的源码查遍了，也没有找到相关代码，不知哪位工程师可以指点一下，可以修改bar，谢谢！