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原文地址::emmc闪存分区挂载_emmc分区挂载_u013323965的博客-CSDN博客 背景 开发板中,emmc嵌入式多媒体控制器即闪存,设备参数有32G闪存,但实际使用命令查询则远远不足,所以怀疑存在未挂载的分区 进行分区查询 执行fdisk -l,显示出/dev/mmcblk0(即闪存)有29G Disk /dev/mmcblk0: 29 GB, 31037849600 bytes, 60620800 sectors 947200 cylinders, 4 heads, 16 sectors/track Units: cylinders of 64 * 512 = 32768 bytes Disk /dev/mmcblk0 doesn't contain a valid partition table Disk /dev/mmcblk0p1: 2048 MB, 2147483648 bytes, 4194304 sectors 65536 cylinders, 4 heads, 16 sectors/track Units: cylinders of 64 * 512 = 32768 bytes Disk /dev/mmcblk0p1 doesn't contain a valid partition table Disk /dev/mmcblk0boot1: 4 MB, 4194304 bytes, 8192 sectors 128 cylinders, 4 heads, 16 sectors/track Units: cylinders of 64 * 512 = 32768 bytes Disk /dev/mmcblk0boot1 doesn't contain a valid partition table Disk /dev/mmcblk0boot0: 4 MB, 4194304 bytes, 8192 sectors 128 cylinders, 4 heads, 16 sectors/track Units: cylinders of 64 * 512 = 32768 bytes Disk /dev/mmcblk0boot0 doesn't contain a valid partition table Note: sector size is 4096 (not 512) Disk /dev/sda: 7 MB, 8384512 bytes, 16376 sectors 127 cylinders, 1 heads, 16 sectors/track Units: cylinders of 16 * 4096 = 65536 bytes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 使用cat /proc/partitions查询分区,发现mmcblk0已有许多分区,其中mmcblk0p4分区有21.9G,怀疑就是该分区未挂载 major minor #blocks name 1 0 16384 ram0 1 1 16384 ram1 1 2 16384 ram2 1 3 16384 ram3 1 4 16384 ram4 1 5 16384 ram5 1 6 16384 ram6 1 7 16384 ram7 1 8 16384 ram8 1 9 16384 ram9 1 10 16384 ram10 1 11 16384 ram11 1 12 16384 ram12 1 13 16384 ram13 1 14 16384 ram14 1 15 16384 ram15 179 0 30310400 mmcblk0 179 1 2097152 mmcblk0p1 179 2 4194304 mmcblk0p2 179 3 1048576 mmcblk0p3 179 4 22970368 mmcblk0p4 # 该处未挂载 179 24 4096 mmcblk0rpmb 179 16 4096 mmcblk0boot1 179 8 4096 mmcblk0boot0 8 0 8188 sda 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 使用df -h查询挂载情况,确实少了21.9G Filesystem Size Used Available Use% Mounted on rootfs 485.0M 29.5M 455.5M 6% / devtmpfs 485.0M 0 485.0M 0% /dev tmpfs 490.8M 0 490.8M 0% /dev/shm tmpfs 490.8M 108.0K 490.7M 0% /tmp tmpfs 490.8M 12.0K 490.8M 0% /run /dev/mmcblk0.xx 3.9G 612.1M 3.1G 16% /xx /dev/mmcblk0.zz 975.9M 2.5M 906.2M 0% /zz 1 2 3 4 5 6 7 8 cd /dev进入文件夹 执行ls -l | grep mmcblk0,查看到mmcblk0.reserved是闪存p4分区的软链接 brw------- 1 root root 179, 0 Jan 1 1970 mmcblk0 lrwxrwxrwx 1 root root 14 Sep 23 00:16 mmcblk0.boot -> /dev/mmcblk0p1 lrwxrwxrwx 1 root root 14 Sep 23 00:16 mmcblk0.xx -> /dev/mmcblk0p2 lrwxrwxrwx 1 root root 14 Sep 23 00:16 mmcblk0.zz -> /dev/mmcblk0p3 lrwxrwxrwx 1 root root 14 Sep 23 00:16 mmcblk0.reserved -> /dev/mmcblk0p4 # p4的软链接 brw------- 1 root root 179, 8 Jan 1 1970 mmcblk0boot0 brw------- 1 root root 179, 16 Jan 1 1970 mmcblk0boot1 brw------- 1 root root 179, 1 Jan 1 1970 mmcblk0p1 brw------- 1 root root 179, 2 Jan 1 1970 mmcblk0p2 brw------- 1 root root 179, 3 Jan 1 1970 mmcblk0p3 brw------- 1 root root 179, 4 Jan 1 1970 mmcblk0p4 brw------- 1 root root 179, 24 Jan 1 1970 mmcblk0rpmb 1 2 3 4 5 6 7 8 9 10 11 12 挂载p4分区 mkdir /opt,创建文件夹 mkfs.vfat /dev/mmcblk0p4,格式化硬盘(自行选择格式) mount /dev/mmcblk0.reserved /opt,挂载分区 (可选)需要开机挂载时,自行找到启动命令,将mount语句放入 ———————————————— 版权声明:本文为CSDN博主「u013323965」的原创文章,遵循CC 4.0 BY-SA版权协议,转载请附上原文出处链接及本声明。 原文链接:https://blog.csdn.net/u013323965/article/details/121074737
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