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github上面好像有一种解决方法，可以使用全部的内存，需要打一个补丁
root@raspberrypi:~# uname -a Linux raspberrypi 4.19.64-v8-test1+ #31 SMP PREEMPT Sun Aug 11 23:47:03 BST 2019 aarch64 GNU/Linux
root@raspberrypi:~# free -h total used free shared buff/cache available Mem: 3.7Gi 151Mi 3.4Gi 8.0Mi 186Mi 3.5Gi Swap: 99Mi 0B 99Mi
root@raspberrypi:~# lsusb Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 002: ID 152d:0562 JMicron Technology Corp. / JMicron USA Technology Corp. Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 045e:001d Microsoft Corp. Natural Keyboard Pro Bus 001 Device 003: ID 0451:1446 Texas Instruments, Inc. TUSB2040/2070 Hub Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
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