Table 14. Kernel boot parameters (continued)
Kernel parameter
Description
Typical value
Used when
of Transparent
Hugepage
support.
loop.max_part
It defines how
many partitions to
be able to
manage per loop
device.
loop.max_part=7
-
6.2.3 DM-verity configuration
DM-verity (device-mapper-verity) provides transparent integrity checking of block devices. It can prevent device from running
unauthorized images. This feature is enabled by default. Replacing one or more partitions (boot, vendor, system, vbmeta) will
make the board unbootable. Disabling DM-verity provides convience for developers, but the device is unprotected.
To disable DM-verity, perform the following steps:
1. Unlock the device.
a. Boot up the device.
b. Choose Settings -> Developer Options -> OEM Unlocking to enable OEM unlocking.
c. Execute the following command on the target side to make the board enter fastboot mode:
reboot bootloader
d. Unlock the device. Execute the following command on the host side:
fastboot oem unlock
e. Wait until the unlock process is complete.
2. Disable DM-verity.
a. Boot up the device.
b. Disable the DM-verity feature. Execute the following command on the host side:
adb root
adb disable-verity
adb reboot
7 Over-The-Air (OTA) Update
7.1 Building OTA update packages
7.1.1 Building target files
You can use the following commands to generate target files under the Android environment:
$ cd ${MY_ANDROID}
$ source build/envsetup.sh
$ lunch evk_8mn-userdebug
$ make target-files-package -j4
NXP Semiconductors
Over-The-Air (OTA) Update
Android
™
User's Guide, Rev. P9.0.0_2.3.2, 6 March 2020
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