diff --git a/bbootimg/src/main/kotlin/Signer.kt b/bbootimg/src/main/kotlin/Signer.kt
index e705329..7634856 100644
--- a/bbootimg/src/main/kotlin/Signer.kt
+++ b/bbootimg/src/main/kotlin/Signer.kt
@@ -62,7 +62,7 @@ class Signer {
                         }
                         addArgument("--internal_release_string")
                         addArgument(ai.header!!.release_string, false)
-                        log.warn(this.toString())
+                        log.info(this.toString())
 
                         File(cfg.info.output + ".clear").copyTo(File(cfg.info.output + ".signed2"))
                         DefaultExecutor().execute(this)
diff --git a/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt b/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
index abcd3cd..33db39c 100644
--- a/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
+++ b/bbootimg/src/main/kotlin/avb/desc/HashDescriptor.kt
@@ -23,13 +23,11 @@ class HashDescriptor(var flags: UInt = 0U,
     : Descriptor(TAG, 0U, 0) {
     var flagsInterpretation: String = ""
         get() {
-            var ret = ""
-            if (this.flags and Header.HashDescriptorFlags.AVB_HASH_DESCRIPTOR_FLAGS_DO_NOT_USE_AB.inFlags.toUInt() == 1U) {
-                ret += "1:no-A/B system"
+            return if (this.flags and Header.HashDescriptorFlags.AVB_HASH_DESCRIPTOR_FLAGS_DO_NOT_USE_AB.inFlags.toUInt() == 1U) {
+                "1:no-A/B system"
             } else {
-                ret += "0:A/B system"
+                "0:A/B system"
             }
-            return ret
         }
 
     constructor(data: InputStream, seq: Int = 0) : this() {
@@ -90,6 +88,7 @@ class HashDescriptor(var flags: UInt = 0U,
                 it.read(randomSalt)
                 log.warn("salt is empty, using random salt[$expectedDigestSize]: " + Helper.toHexString(randomSalt))
                 this.salt = randomSalt
+                this.salt_len = this.salt.size.toUInt()
             }
         } else {
             log.info("preset salt[${this.salt.size}] is valid: ${Hex.encodeHexString(this.salt)}")
@@ -113,6 +112,7 @@ class HashDescriptor(var flags: UInt = 0U,
             }.digest()
             log.info("Digest(salt + file): " + Helper.toHexString(newDigest))
             this.digest = newDigest
+            this.digest_len = this.digest.size.toUInt()
         }
 
         return this
diff --git a/bbootimg/src/main/kotlin/bootimg/Packer.kt b/bbootimg/src/main/kotlin/bootimg/Packer.kt
index 22dd563..a18de02 100644
--- a/bbootimg/src/main/kotlin/bootimg/Packer.kt
+++ b/bbootimg/src/main/kotlin/bootimg/Packer.kt
@@ -156,7 +156,7 @@ class Packer {
         val googleCmd = info2.toCommandLine().apply {
             addArgument(cfg.info.output + ".google")
         }
-        log.warn(googleCmd.toString())
+        log.info(googleCmd.toString())
         DefaultExecutor().execute(googleCmd)
 
         val ourHash = hashFileAndSize(cfg.info.output + ".clear")
diff --git a/doc/additional_tricks.md b/doc/additional_tricks.md
index 7be4ee2..ddd69c2 100644
--- a/doc/additional_tricks.md
+++ b/doc/additional_tricks.md
@@ -58,3 +58,7 @@ This part is contributed by @Surendrajat, thanks!
 #### libsparse: output\_file.cpp
 
 *typeof* is missing in macos clang++, need to change it to *decltype* instead.
+
+## using pre-packed ramdisk.img.gz
+place 'ramdisk.img.gz' in directory, delete "root/", program will use it as prebuilt.
+
diff --git a/integrationTest.py b/integrationTest.py
index be034bf..3be0b26 100755
--- a/integrationTest.py
+++ b/integrationTest.py
@@ -72,6 +72,12 @@ def verifySingleDir(inResourceDir, inImageDir):
         cleanUp()
         verifySingleJson(jsonFile)
         cleanUp()
+    pyFiles = glob.glob(os.path.join(resDir, imgDir) + "/*.py")
+    for pyFile in pyFiles:
+        cleanUp()
+        log.warning("calling %s" % pyFile)
+        subprocess.check_call(pyFile, shell = True)
+        cleanUp()
 
 def decompressXZ(inFile, outFile):
     with lzma.open(inFile) as f:
@@ -102,6 +108,9 @@ def main():
     # from volunteers
     verifySingleDir(resDir, "recovery_image_from_s-trace")
 
+    # 10
+    verifySingleDir(resDir, "10.0.0_coral-qq1d.200205.002")
+
     log.info(successLogo)
 
 if __name__ == "__main__":
diff --git a/src/integrationTest/resources b/src/integrationTest/resources
index 2b95308..b38a8c9 160000
--- a/src/integrationTest/resources
+++ b/src/integrationTest/resources
@@ -1 +1 @@
-Subproject commit 2b95308b91c2c0a564451b744354b2ef1428311d
+Subproject commit b38a8c9e9763aefa1584e80b866efb0173cae04b