我的问题应该源于我对ubi和的误解MTD。但是，我无法通过谷歌搜索找到答案（并且没有找到好的教程）。
我只是想知道我的Nand Flash的总容量，所以我使用df -h
Filesystem Size Used Available Use% Mounted on
ubi0:rootfs 1.8G 46.8M 1.8G 3% /
devtmpfs 375.4M 0 375.4M 0% /dev
tmpfs 503.5M 0 503.5M 0% /dev/shm
tmpfs 503.5M 436.0K 503.1M 0% /tmp
/dev/ubi0_0 1.8G 46.8M 1.8G 3% /mnt/nand
到目前为止一切顺利，我的设备似乎有 2 个 nand ：总共ubi0_0大约ubi0:rootfs4 G（我对吗 ？）
据我所知，是一个在;UBIFS之上使用的文件系统。MTD因此，当我运行时mtdinfo -a，我应该能够看到mtd设备信息和容量。我的问题是，我有 4 台MTD设备，总容量为2 GB（大部分来自mtd0）。为什么df -h显示我2 * 1.8 GB却mtdinfo显示2 GB:
# mtdinfo -a
Count of MTD devices: 4
Present MTD devices: mtd0, mtd1, mtd2, mtd3
Sysfs interface supported: yes
mtd0
Name: gpmi-nand
Type: nand
Eraseblock size: 524288 bytes, 512.0 KiB
Amount of eraseblocks: 4096 (2147483648 bytes, 2.0 GiB)
Minimum input/output unit size: 4096 bytes
Sub-page size: 4096 bytes
OOB size: 224 bytes
Character device major/minor: 90:0
Bad blocks are allowed: true
Device is writable: true
mtd1
Name: U-Boot
Type: nor
Eraseblock size: 65536 bytes, 64.0 KiB
Amount of eraseblocks: 12 (786432 bytes, 768.0 KiB)
Minimum input/output unit size: 1 byte
Sub-page size: 1 byte
Character device major/minor: 90:2
Bad blocks are allowed: false
Device is writable: false
mtd2
Name: env
Type: nor
Eraseblock size: 65536 bytes, 64.0 KiB
Amount of eraseblocks: 1 (65536 bytes, 64.0 KiB)
Minimum input/output unit size: 1 byte
Sub-page size: 1 byte
Character device major/minor: 90:4
Bad blocks are allowed: false
Device is writable: false
mtd3
Name: Kernel
Type: nor
Eraseblock size: 65536 bytes, 64.0 KiB
Amount of eraseblocks: 114 (7471104 bytes, 7.1 MiB)
Minimum input/output unit size: 1 byte
Sub-page size: 1 byte
Character device major/minor: 90:6
Bad blocks are allowed: false
Device is writable: true
#
答案1
您的gpmi-nand设备似乎安装了两次，如/和/mnt/nand。您可以通过在中创建文件来验证这一点/root；它也应该出现在/mnt/nand/root... 所以你实际上只安装了一个 2GB 分区，它与mtdinfo的输出匹配。