给 nanopi m2 Android系统安装busybox

本次参考了http://blog.youkuaiyun.com/lxgwm2008/article/details/38925051

但在原有基础上有一定创新

1.首先有一块nanopi2 的开发板，CPU是 4418芯片

2. 下载busybox。
下载地址：http://www.busybox.net/downloads/binaries/1.21.1/
（目前最新版是1.21.1）
打开网页后可以看到busybox支持了各种不同的arch，这里需要选择跟手机arch一致的版本。
 4418芯片是arm-v7，因此选择busybox-armv7l。
3. 安装busybox
将下载的busybox-armv7l改名为busybox，然后push到手机的/system目录下：
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1. adb push busybox /system  
注：
a）如果遇到提示说没有权限，请先执行su
b）如果提示Read-only file system，则需要将/system目录重新挂在为可读写方式。具体可参考：http://blog.youkuaiyun.com/hktkfly6/article/details/52496703 （nanopi m2开发板 mount：Read-only file system Android手机不能挂载读写，终极解决方案）
c)对于未获得root权限的手机，可以先push到sd卡目录，push busybox /mnt/sdcard。可以安装kingroot获取root权限。得到root权限后adb shell 登录后，再cp busybox /system/bin/
push成功后，开始安装busybox:
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1. chmod 755 busybox  
2. ./busybox --install  
注意："./"很重要
 此命令将busybox默认安装到/usr/bin目录下。有些手机没有这个目录，比如nanopi2 的开发板，其目录是/system/bin，这是需要更改默认安装目录：
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1. ./busybox --install /system/bin  
注意："./"很重要
安装成功后，执行busybox命令，会有如下提示：
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1. shell@hlte:/ $ busybox  
2. busybox  
3. BusyBox v1.21.1 (2013-07-08 10:26:30 CDT) multi-call binary.  
4. BusyBox is copyrighted by many authors between 1998-2012.  
5. Licensed under GPLv2. See source distribution for detailed  
6. copyright notices.  
7.  
8. Usage: busybox [function [arguments]...]  
9.   or: busybox --list[-full]  
10.   or: busybox --install [-s] [DIR]  
11.   or: function [arguments]...  
12.  
13.        BusyBox is a multi-call binary that combines many common Unix  
14.        utilities into a single executable.  Most people will create a  
15.        link to busybox for each function they wish to use and BusyBox  
16.        will act like whatever it was invoked as.  
17.  
18. Currently defined functions:  
19.        [, [[, acpid, add-shell, addgroup, adduser, adjtimex, arp, arping, ash,  
20.        awk, base64, basename, beep, blkid, blockdev, bootchartd, brctl,  
21.        bunzip2, bzcat, bzip2, cal, cat, catv, chat, chattr, chgrp, chmod,  
22.        chown, chpasswd, chpst, chroot, chrt, chvt, cksum, clear, cmp, comm,  
23.        conspy, cp, cpio, crond, crontab, cryptpw, cttyhack, cut, date, dc, dd,  
24.        deallocvt, delgroup, deluser, depmod, devmem, df, dhcprelay, diff,  
25.        dirname, dmesg, dnsd, dnsdomainname, dos2unix, du, dumpkmap,  
26.        dumpleases, echo, ed, egrep, eject, env, envdir, envuidgid, ether-wake,  
27.        expand, expr, fakeidentd, false, fbset, fbsplash, fdflush, fdformat,  
28.        fdisk, fgconsole, fgrep, find, findfs, flock, fold, free, freeramdisk,  
29.        fsck, fsck.minix, fsync, ftpd, ftpget, ftpput, fuser, getopt, getty,  
30.        grep, groups, gunzip, gzip, halt, hd, hdparm, head, hexdump, hostid,  
31.        hostname, httpd, hush, hwclock, id, ifconfig, ifdown, ifenslave,  
32.        ifplugd, ifup, inetd, init, insmod, install, ionice, iostat, ip,  
33.        ipaddr, ipcalc, ipcrm, ipcs, iplink, iproute, iprule, iptunnel,  
34.        kbd_mode, kill, killall, killall5, klogd, last, less, linux32, linux64,  
35.        linuxrc, ln, loadfont, loadkmap, logger, login, logname, logread,  
36.        losetup, lpd, lpq, lpr, ls, lsattr, lsmod, lsof, lspci, lsusb, lzcat,  
37.        lzma, lzop, lzopcat, makedevs, makemime, man, md5sum, mdev, mesg,  
38.        microcom, mkdir, mkdosfs, mke2fs, mkfifo, mkfs.ext2, mkfs.minix,  
39.        mkfs.vfat, mknod, mkpasswd, mkswap, mktemp, modinfo, modprobe, more,  
40.        mount, mountpoint, mpstat, mt, mv, nameif, nanddump, nandwrite,  
41.        nbd-client, nc, netstat, nice, nmeter, nohup, nslookup, ntpd, od,  
42.        openvt, passwd, patch, pgrep, pidof, ping, ping6, pipe_progress,  
43.        pivot_root, pkill, pmap, popmaildir, poweroff, powertop, printenv,  
44.        printf, ps, pscan, pstree, pwd, pwdx, raidautorun, rdate, rdev,  
45.        readahead, readlink, readprofile, realpath, reboot, reformime,  
46.        remove-shell, renice, reset, resize, rev, rm, rmdir, rmmod, route, rpm,  
47.        rpm2cpio, rtcwake, run-parts, runlevel, runsv, runsvdir, rx, script,  
48.        scriptreplay, sed, sendmail, seq, setarch, setconsole, setfont,  
49.        setkeycodes, setlogcons, setserial, setsid, setuidgid, sh, sha1sum,  
50.        sha256sum, sha3sum, sha512sum, showkey, slattach, sleep, smemcap,  
51.        softlimit, sort, split, start-stop-daemon, stat, strings, stty, su,  
52.        sulogin, sum, sv, svlogd, swapoff, swapon, switch_root, sync, sysctl,  
53.        syslogd, tac, tail, tar, tcpsvd, tee, telnet, telnetd, test, tftp,  
54.        tftpd, time, timeout, top, touch, tr, traceroute, traceroute6, true,  
55.        tty, ttysize, tunctl, udhcpc, udhcpd, udpsvd, umount, uname, unexpand,  
56.        uniq, unix2dos, unlzma, unlzop, unxz, unzip, uptime, users, usleep,  
57.        uudecode, uuencode, vconfig, vi, vlock, volname, wall, watch, watchdog,  
58.        wc, wget, which, who, whoami, whois, xargs, xz, xzcat, yes, zcat, zcip  
59.  
60. shell@hlte:/ $  
安装busybox的好处是可以执行一些系统不带的命令，比如ifconfig
#busybox ifconfig
未安装时无任何输出，安装后输出效果与Linux系统一致。