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Products launching with API 28 needs system-as-root

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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  - The ramdisk contains /init.rc, which also may be out of date compared to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
Merged-In: Ic04c63bd2aac3afa686a6f5cb124beebbcd6a5ee
(cherry picked from commit ed3b1ca12c)
This commit is contained in:
Bowgo Tsai 2018-03-26 22:10:57 +08:00
parent e57c1d03e0
commit 993583cd79
1 changed files with 5 additions and 0 deletions
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5
core/config.mk
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@ -852,6 +852,11 @@ ifdef PRODUCT_SHIPPING_API_LEVEL
$(error When PRODUCT_SHIPPING_API_LEVEL >= 28, TARGET_USES_64_BIT_BINDER must be true)
endif
endif
ifeq ($(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