我有一个基于arm64的dragonboard410c，当它启动时，它会显示内存布局：
software IO TLB [mem 0xb6c00000-0xbac00000] (64MB) mapped at [ff]
Memory: 780212K/951296K available (9940K kernel code, 1294K rwda)
Virtual kernel memory layout:
vmalloc : 0xffffff8000000000 - 0xffffffbdbfff0000 ( 246 )
vmemmap : 0xffffffbdc0000000 - 0xffffffbfc0000000 ( 8 )
0xffffffbdc0000000 - 0xffffffbdc1000000 ( 16 )
fixed : 0xffffffbffa7fd000 - 0xffffffbffac00000 ( 4108 )
PCI I/O : 0xffffffbffae00000 - 0xffffffbffbe00000 ( 16 )
modules : 0xffffffbffc000000 - 0xffffffc000000000 ( 64 )
memory : 0xffffffc000000000 - 0xffffffc040000000 ( 1024 )
.init : 0xffffffc000e49000 …