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docs: Add workaround for missing P6 OTAs 

Bug: 235336567
Test: N/A
Change-Id: I0a19c91b4fd00467a202727a26e9f4bc25d98583
This commit is contained in:
Pierre-Clément Tosi 2022-06-10 15:09:09 +01:00
parent 60c8aef052
commit 072c11f787
1 changed files with 29 additions and 0 deletions
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29
docs/getting_started/index.md
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@ -43,6 +43,35 @@ fastboot oem pkvm enable
fastboot reboot
```
Due to a bug in Android 13 for these devices, pKVM may stop working after an
[OTA update](https://source.android.com/devices/tech/ota). To prevent this, it
is necessary to manually replicate the `pvmfw` partition across A/B slots:
```shell
adb root
SLOT=$(adb shell getprop ro.boot.slot_suffix)
adb pull /dev/block/by-name/pvmfw${SLOT} pvmfw.img
adb reboot bootloader
fastboot --slot other flash pvmfw pvmfw.img
fastboot reboot
```
Otherwise, if an OTA has already made pKVM unusable, the working partition
should be copied over from the "other" slot:
```shell
adb pull $(adb shell ls "/dev/block/by-name/pvmfw!(${SLOT})") pvmfw.img
adb reboot bootloader
fastboot flash pvmfw pvmfw.img
fastboot reboot
```
Finally, if the `pvmfw` partition has been corrupted, both slots may be flashed
using the [`pvmfw.img` pre-built](https://android.googlesource.com/platform/packages/modules/Virtualization/+/refs/heads/master/pvmfw/pvmfw.img)
as long as the bootloader remains unlocked. Otherwise, a fresh install of
Android 13 followed by the manual steps above for flashing the `other` slot
should be used as a last resort.
## Running demo app
The instruction is [here](../../demo/README.md).