为了延长磁盘寿命来存储音视频文件，打发在格式化磁盘过程中将簇的大小设置大点。因为存储的音视频文件现对较大，那么将簇大小设置得尽可能大，这样可以增强磁盘读取数据的性能，同时也不会浪费太多空间。
但发现我们设备的mkfs.vfat不支持-s参数设置簇的大小。
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于是打算重新移植mkfs.vfat.
思路1
重新移植busybox
1.官网上下载最新的busybox源码
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2.修改Makefile
ARCH =arm
CROSS_COMPILE = /opt/hisi-linux-nptl/arm-hisiv100-linux/target/bin/arm-hisiv100nptl-linux-
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2.make menuconfig
设置为静态库
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3.make
出现错误
make: *** [busybox_unstripped] Error 1
root@chenwr-pc:/home/soft/busybox-1.31.0# make
LINK busybox_unstripped
Your linker does not support --sort-section,alignment
Your linker does not support --sort-common
Static linking against glibc, can't use --gc-sections
Trying libraries: crypt m resolv
Failed: -Wl,--start-group -lcrypt -lm -lresolv -Wl,--end-group
Output of:
/opt/hisi-linux-nptl/arm-hisiv100-linux/target/bin/arm-hisiv100nptl-linux-gcc -Wall -Wshadow -Wwrite-strings -Wundef -Wstrict-prototypes -Wunused -Wunused-parameter -Wunused-function -Wunused-value -Wmissing-prototypes -Wmissing-declarations -Wno-format-security -Wdeclaration-after-statement -Wold-style-definition -fno-builtin-strlen -finline-limit=0 -fomit-frame-pointer -ffunction-sections -fdata-sections -fno-guess-branch-probability -funsigned-char -static-libgcc -falign-functions=1 -falign-jumps=1 -falign-labels=1 -falign-loops=1 -fno-unwind-tables -fno-asynchronous-unwind-tables -fno-builtin-printf -Os -static -march=armv7l -o busybox_unstripped -Wl,--start-group applets/built-in.o archival/lib.a archival/libarchive/lib.a console-tools/lib.a coreutils/lib.a coreutils/libcoreutils/lib.a debianutils/lib.a klibc-utils/lib.a e2fsprogs/lib.a editors/lib.a findutils/lib.a init/lib.a libbb/lib.a libpwdgrp/lib.a loginutils/lib.a mailutils/lib.a miscutils/lib.a modutils/lib.a networking/lib.a networking/libiproute/lib.a networking/udhcp/lib.a printutils/lib.a procps/lib.a runit/lib.a selinux/lib.a shell/lib.a sysklogd/lib.a util-linux/lib.a util-linux/volume_id/lib.a archival/built-in.o archival/libarchive/built-in.o console-tools/built-in.o coreutils/built-in.o coreutils/libcoreutils/built-in.o debianutils/built-in.o klibc-utils/built-in.o e2fsprogs/built-in.o editors/built-in.o findutils/built-in.o init/built-in.o libbb/built-in.o libpwdgrp/built-in.o loginutils/built-in.o mailutils/built-in.o miscutils/built-in.o modutils/built-in.o networking/built-in.o networking/libiproute/built-in.o networking/udhcp/built-in.o printutils/built-in.o procps/built-in.o runit/built-in.o selinux/built-in.o shell/built-in.o sysklogd/built-in.o util-linux/built-in.o util-linux/volume_id/built-in.o -Wl,--end-group -Wl,--start-group -lcrypt -lm -lresolv -Wl,--end-group
==========
networking/lib.a(ipcalc.o): In function `ipcalc_main':
ipcalc.c:(.text.ipcalc_main+0x24c): warning: gethostbyaddr is obsolescent, use getaddrinfo() instead.
libbb/lib.a(inet_common.o): In function `INET_resolve':
inet_common.c:(.text.INET_resolve+0x60): warning: gethostbyname is obsolescent, use getnameinfo() instead.
coreutils/lib.a(mktemp.o): In function `mktemp_main':
mktemp.c:(.text.mktemp_main+0x8c): warning: the use of `mktemp' is dangerous, better use `mkstemp'
networking/lib.a(nslookup.o): In function `add_query':
nslookup.c:(.text.add_query+0x70): undefined reference to `res_mkquery'
networking/lib.a(nslookup.o): In function `send_queries':
nslookup.c:(.text.send_queries+0x2d0): undefined reference to `__ns_initparse'
nslookup.c:(.text.send_queries+0x308): undefined reference to `__ns_parserr'
nslookup.c:(.text.send_queries+0x480): undefined reference to `__ns_get16'
nslookup.c:(.text.send_queries+0x5cc): undefined reference to `__ns_get32'
nslookup.c:(.text.send_queries+0x5e4): undefined reference to `__ns_get32'
nslookup.c:(.text.send_queries+0x5fc): undefined reference to `__ns_get32'
nslookup.c:(.text.send_queries+0x614): undefined reference to `__ns_get32'
nslookup.c:(.text.send_queries+0x628): undefined reference to `__ns_get32'
util-linux/lib.a(fallocate.o): In function `fallocate_main':
fallocate.c:(.text.fallocate_main+0x80): undefined reference to `posix_fallocate'
util-linux/lib.a(unshare.o): In function `unshare_main':
unshare.c:(.text.unshare_main+0x1ec): undefined reference to `unshare'
collect2: ld returned 1 exit status
Note: if build needs additional libraries, put them in CONFIG_EXTRA_LDLIBS.
Example: CONFIG_EXTRA_LDLIBS="pthread dl tirpc audit pam"
make: *** [busybox_unstripped] Error 1
重新make menuconfig 进入设置把报错的模块关闭不勾选。
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参考网上的说法，还是会有很多错误。而且关闭很多网络的东西和系统的配置，担心万一影响到其他命令呢。因为我发现原来移植后的busybox，比如ls命令，不是单独的一个bin文件。而是软连接到busybox中
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而且我发觉设备的空间有限，原先的busybox才800多k，即使新移植成功也要2M多。于是换个思路，单独源码移植mkfs.vfat
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思路2
1.去官网下载源码
http://ftp.de.debian.org/debian/pool/main/d/dosfstools/
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2.解压
命令：tar -xvf dosfstools_3.0.27.orig.tar.xz
3.编译
不用修改Makefile，直接编译的时候把编译器参数传递进去即可。
make CC=arm-hisiv100nptl-linux-gcc
编译成功后生成。
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4.放入设备测试
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到此该命令移植完毕。
默认设置的簇大小
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mkfs.vfat -s 32 /dev/sda1
重新格式化之后，簇大小设置为32.
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