Products launching with API 28 needs system-as-root
With project Treble, it's possible to only update system.img across
Android major releases without changing other partitions. However,
for non-A/B devices, ramdisk cannot be updated via a system-only OTA
because it resides in /boot partition.
This leads to two major incompatibility issues:
- The older /init in ramdisk might not be able to parse the *.rc files
on /system.
- The ramdisk contains /init.rc, which also may be out of date compared to
what is required for the new /system.
Therefore, for new devices launched in P with full Treble support, ramdisk
should be merged into system.img by setting
BOARD_BUILD_SYSTEM_ROOT_IMAGE := True.
Upgrading devices can keep using non-system-as-root configuration.
Bug: 64194858
Test: manual makefile prodding
Change-Id: Ic04c63bd2aac3afa686a6f5cb124beebbcd6a5ee
diff --git a/core/config.mk b/core/config.mk
index 57d1128..9e04eea 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -843,6 +843,11 @@
$(error When PRODUCT_SHIPPING_API_LEVEL >= 28, TARGET_USES_64_BIT_BINDER must be true)
endif
endif
+ ifeq ($(PRODUCT_FULL_TREBLE),true)
+ ifneq ($(BOARD_BUILD_SYSTEM_ROOT_IMAGE), true)
+ $(error When PRODUCT_SHIPPING_API_LEVEL >= 28, BOARD_BUILD_SYSTEM_ROOT_IMAGE must be true)
+ endif
+ endif
endif
endif