Enable /cache mount point
Non-A/B devices using AOSP OTA flow will mount /cache in the
fstab file. Without setting BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE,
/cache will be a symlink to /data/cache which introduces the
failure of `mount_all /vendor/etc/fstab.{ro.hardware}`. This is
because all devices laucned in P need to switch to "system-as-root".
This CL sets board config to create /cache directory in rootfs
(system-as-root GSI image). Note that A/B devices doesn't mount
or use /cache so leaving an empty /cache in rootfs has no harm.
Bug: 78485405
Test: Boot GSI on walleye
Change-Id: Ic260d2917cc64c9497f5f60ea11303e953e80efd
diff --git a/target/board/generic_arm64_ab/BoardConfig.mk b/target/board/generic_arm64_ab/BoardConfig.mk
index 286a741..fc6b582 100644
--- a/target/board/generic_arm64_ab/BoardConfig.mk
+++ b/target/board/generic_arm64_ab/BoardConfig.mk
@@ -36,6 +36,11 @@
BOARD_ROOT_EXTRA_FOLDERS += firmware firmware/radio persist
BOARD_ROOT_EXTRA_SYMLINKS := /vendor/lib/dsp:/dsp
+# Set this to create /cache mount point for non-A/B devices that mounts /cache.
+# The partition size doesn't matter, just to make build pass.
+BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4
+BOARD_CACHEIMAGE_PARTITION_SIZE := 16777216
+
# TODO(b/36764215): remove this setting when the generic system image
# no longer has QCOM-specific directories under /.
BOARD_SEPOLICY_DIRS += build/target/board/generic_arm64_ab/sepolicy