首先在烧写前需要将自动扩展分区的服务关掉。 OK8MM-linux-fs/OK8MM-linux-fs/lib/systemd/system/resize-helper.service 烧写后先确认想虚拟成U盘的分区大小，这里我将mmcblk2分区拿出2G虚拟成U盘 root@okmx8mm:~# fdisk -l Disk /dev/mmcblk2: 7.3 GiB, 7818182656 bytes, 15269888 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 Disklabel type: dos Disk identifier: 0xb7f57906 Device Boot Start End Sectors Size Id Type /dev/mmcblk2p1 16384 147455 131072 64M c W95 FAT32 (LBA) /dev/mmcblk2p2 147456 6438911 6291456 3G 83 Linux Disk /dev/mmcblk2rpmb: 4 MiB, 4194304 bytes, 8192 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 /dev/mmcblk2boot1: 4 MiB, 4194304 bytes, 8192 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 /dev/mmcblk2boot0: 4 MiB, 4194304 bytes, 8192 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 Disklabel type: dos Disk identifier: 0x8cc5ac8c Device Boot Start End Sectors Size Id Type /dev/mmcblk2boot0p1 16384 147455 131072 64M c W95 FAT32 (LBA) /dev/mmcblk2boot0p2 147456 6438911 6291456 3G 83 Linux root@okmx8mm:~# fdisk /dev/mmcblk2 Welcome to fdisk (util-linux 2.32.1). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. Command (m for help): p Disk /dev/mmcblk2: 7.3 GiB, 7818182656 bytes, 15269888 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 Disklabel type: dos Disk identifier: 0xb7f57906 Device Boot Start End Sectors Size Id Type /dev/mmcblk2p1 16384 147455 131072 64M c W95 FAT32 (LBA) /dev/mmcblk2p2 147456 6438911 6291456 3G 83 Linux Command (m for help): n Partition type p primary (2 primary, 0 extended, 2 free) e extended (container for logical partitions) Select (default p): p Partition number (3,4, default 3): 3 First sector (2048-15269887, default 2048): 6500000 Last sector, +sectors or +size{K,M,G,T,P} (6500000-15269887, default 15269887): +2G Created a new partition 3 of type 'Linux' and of size 2 GiB. Command (m for help): w The partition table has been altered. Syncing disks. root@okmx8mm:~# ls /dev/mmcblk2* /dev/mmcblk2 /dev/mmcblk2boot1 /dev/mmcblk2p2 /dev/mmcblk2rpmb /dev/mmcblk2boot0 /dev/mmcblk2p1 /dev/mmcblk2p3 resize2fs: New size smaller than minimum (1117578) root@okmx8mm:~# mkdosfs -F 32 /dev/mmcblk2p3 mkfs.fat 4.1 (2017-01-24) root@okmx8mm:~# insmod /lib/modules/4.14.78/kernel/drivers/usb/gadget/legacy/g_mass_storage.ko removable=1 file=/dev/mmcblk2p3 [ 793.029709] Mass Storage Function, version: 2009/09/11 [ 793.034942] LUN: removable file: (no medium) [ 793.039425] LUN: removable file: /dev/mmcblk2p3 [ 793.044029] Number of LUNs=1 [ 793.047096] g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11 [ 793.054104] g_mass_storage gadget: userspace failed to provide iSerialNumber [ 793.061195] g_mass_storage gadget: g_mass_storage ready root@okmx8mm:~# [ 798.512590] g_mass_storage gadget: high-speed config #1: Linux File-Backed Storage root@okmx8mm:~# mkdir /run/media/mmcblk2p3 root@okmx8mm:~# mount /dev/mmcblk2p3 /run/media/mmcblk2p3 |
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