Update README.md for build system changes. am: 5e92570cd3
am: 09f9f5c894
Change-Id: Ib286727ad3aafe32086f71e80edb687276572cf1
diff --git a/README.md b/README.md
index 8a58b3e..775dbe4 100644
--- a/README.md
+++ b/README.md
@@ -306,7 +306,10 @@
This will make the build system create `vbmeta.img` which will contain
a hash descriptor for `boot.img`, a hashtree descriptor for
`system.img`, a kernel-cmdline descriptor for setting up `dm-verity`
-for `system.img` and append a hash-tree to `system.img`.
+for `system.img` and append a hash-tree to `system.img`. If the build
+system is set up such that `vendor.img` is being built, a hash-tree
+will also be appended to this image and its hash-tree descriptor will
+be included in `vbmeta.img`.
By default, the algorithm `SHA256_RSA4096` is used with a test key
from the `external/avb/test/data` directory. This can be overriden by
@@ -335,19 +338,23 @@
The variable `BOARD_AVB_MAKE_VBMETA_IMAGE_ARGS` can be used to specify
additional options passed to `avbtool make_vbmeta_image`. Typical
-options to be used here include `--prop`, `--prop_from_file`, and
-`--chain_partition`.
+options to be used here include `--prop`, `--prop_from_file`,
+`--chain_partition`, `--public_key_metadata`, and `--signing_helper`.
-The variable `BOARD_AVBTOOL_BOOT_ADD_HASH_FOOTER_ARGS` can be used to
+The variable `BOARD_AVB_BOOT_ADD_HASH_FOOTER_ARGS` can be used to
specify additional options passed to `avbtool add_hash_footer` for
`boot.img`. Typical options to be used here include `--hash_algorithm`
and `--salt`.
-The variable `BOARD_AVBTOOL_SYSTEM_ADD_HASHTREE_FOOTER_ARGS` can be
-used to specify additional options passed to `avbtool
-add_hashtree_footer` for `system.img`. Typical options to be used here
-include `--hash_algorithm`, `--salt`, `--block_size`, and
-`--generate_fec`.
+The variable `BOARD_AVB_SYSTEM_ADD_HASHTREE_FOOTER_ARGS` can be used
+to specify additional options passed to `avbtool add_hashtree_footer`
+for `system.img`. Typical options to be used here include
+`--hash_algorithm`, `--salt`, `--block_size`, and `--generate_fec`.
+
+The variable `BOARD_AVB_VENDOR_ADD_HASHTREE_FOOTER_ARGS` can be used
+to specify additional options passed to `avbtool add_hashtree_footer`
+for `vendor.img`. Typical options to be used here include
+`--hash_algorithm`, `--salt`, `--block_size`, and `--generate_fec`.
Build system variables (such as `PRODUCT_SUPPORTS_VERITY_FEC`) used
for previous version of Verified Boot in Android are not used in AVB