本文主要是介绍emmc挂载，分区及格式化，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
https://blog.csdn.net/u011975319/article/details/51803126
该文章整合了一些网上的资源，如有侵权请告知，我会进行相应删除
1.linux 嵌入式时使用的emmc 最开始是没有进行分区设置的，所以系统要挂载emmc 需要先对emmc 进行分区及格式化。
首先需要使用fdisk 进行emmc 分区，下面为log 及说明
fdisk /dev/mmcblk1
Command (m for help): m ---输入m获取fdisk工具的使用说明
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): n ---输入n创建新的分区
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p ---输入p创建primary分区
Partition number (1-4, default 1): 1 ---输入分区号
First sector (2048-31116287, default 2048): ---输入该分区的起始地址，回车使用默认值
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-31116287, default 31116287): 10000000 ---输入该分区的结束地址
Command (m for help): n ---创建第二个分区
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): p
Partition number (1-4, default 2): 2
First sector (10000001-31116287, default 10000001):
Using default value 10000001
Last sector, +sectors or +size{K,M,G} (10000001-31116287, default 31116287): 20000000
Command (m for help): n ---创建第三个分区
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p
Partition number (1-4, default 3): 3
First sector (20000001-31116287, default 20000001):
Using default value 20000001
Last sector, +sectors or +size{K,M,G} (20000001-31116287, default 31116287):
Using default value 31116287
Command (m for help): p ---打印mmcblk1的分区情况
Disk /dev/sdb: 15.9 GB, 15931539456 bytes
64 heads, 32 sectors/track, 15193 cylinders, total 31116288 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00090a89
Device Boot Start End Blocks Id System
/dev/sdb1 2048 10000000 4998976+ 83 Linux
/dev/sdb2 10000001 20000000 5000000 83 Linux
/dev/sdb3 20000001 31116287 5558143+ 83 Linux
Command (m for help): t ---修改分区的系统类型
Partition number (1-4): 1 ---选择要修改的分区号
Hex code (type L to list codes): l ---打印可设置的系统类型
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list codes): c ---设置第一分区为W95 FAT32 (LBA)格式
Changed system type of partition 1 to c (W95 FAT32 (LBA))
Command (m for help): t
Partition number (1-4): 2 ---修改第二分区的系统类型
Hex code (type L to list codes): c
Changed system type of partition 2 to c (W95 FAT32 (LBA))
Command (m for help): t
Partition number (1-4): 3 ---修改第三分区的系统类型
Hex code (type L to list codes): c
Changed system type of partition 3 to c (W95 FAT32 (LBA))
Command (m for help): p ---打印mmcblk1的分区情况
Disk /dev/sdb: 15.9 GB, 15931539456 bytes
64 heads, 32 sectors/track, 15193 cylinders, total 31116288 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00090a89
Device Boot Start End Blocks Id System
/dev/sdb1 2048 10000000 4998976+ c W95 FAT32 (LBA)
/dev/sdb2 10000001 20000000 5000000 c W95 FAT32 (LBA)
/dev/sdb3 20000001 31116287 5558143+ c W95 FAT32 (LBA)
Command (m for help): w ---保存分区设置并退出
The partition table has been altered!
Calling ioctl() to re-read partition table.
执行：mkdosfs /dev/mmcblk1p1 ---将/dev/mmcblk1p1格式化为FAT32格式
使用mount命令进行分区挂载
2.获取dosfstools（mkfs.vfat）源码
输入命令：
dpkg -S `type -p mkfs.vfat`
这个命令会输出这个命令所在的包，如下是输出
dosfstools: /sbin/mkfs.vfat
type -p mkfs.vfat
是列出 mkfs.vfat命令所在的位置
/sbin/mkfs.vfat
dpkg -S是列出命令的包
第二步，下载这个包
apt-get source dosfstools
这样就得到了mkfs.vfat命令的源代码了
3.dosfstools的交叉编译
源码下面没有找相关的CC交叉编译环境的设置，直接使用make CC=arm-xxxx-xxx-gcc 即可直接进行交叉编译
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作者：山野1村夫
来源：CSDN
原文：https://blog.csdn.net/u011975319/article/details/51803126
版权声明：本文为博主原创文章，转载请附上博文链接！
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