NXP Semiconductors ASUG, Руководство пользователя

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• [Partition type/index] which is defined in the GPT.
• [Start Offset] shows where partition is started, unit in MB.
The system partition is used to put the built-out Android system image. The userdata parition is used to put the unpacked codes/
data of the applications, system configuration database, etc. In normal boot mode, the root file system is mounted from the system
partition. In recovery mode, the root file system is mounted from the boot partition.
Table 9. Storage partitions
Partition type/index Name Start offset Size File system Content
N/A bootloader 0 KB (i.MX 8M
Nano EVK
eMMC), 32 KB
(i.MX 8M Nano
EVK, i.MX
8QuadXPlus
MEK SD card) 4 MB N/A bootloader
1 dtbo_a 8 MB 4 MB N/A dtbo.img
2 dtbo_b Follow dtbo_a 4 MB N/A dtbo.img
3 boot_a Follow dtbo_b 48 MB boot.img format, a
recovery
ramdisk boot.img
4 boot_b
Follow boot_a 48 MB
boot.img format, a
recovery
ramdisk boot.img
5
system_a
Follow boot_b 2560 MB
EXT4. Mount as /
system Android system files under /
system/dir
6
system_b Follow
system_a
2560 MB
EXT4. Mount as /
system Android system files under /
system/dir
7
misc Follow
system_b 4 MB N/A For recovery store
bootloader message, reserve
8
metadata Follow misc 2 MB N/A For system slide show
9 presistdata Follow
metadata 1 MB N/A Option to operate unlock
\unlock
10 vendor_a Follow
persistdata 256 MB EXT4. Mount at /
vendor vendor.img
11 vendor_b Follow
vendor_a 256 MB EXT4. Mount at /
vendor vendor.img
12 userdata Follow
vendor_b Remained
space EXT4. Mount at /
data Application data storage for
system application, and for
internal media partition,
in /mnt/sdcard/ dir.
Table continues on the next page...
NXP Semiconductors
Programming Images
Android
™
User's Guide, Rev. P9.0.0_2.3.2, 6 March 2020
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