Android11代码路径：

external/avb/libavb

修改点：

android/external/avb$ git diff
diff --git a/Android.bp b/Android.bp
index dfb1cc1..c4ddea0 100644
--- a/Android.bp
+++ b/Android.bp
@@ -208,7 +208,7 @@ cc_library_static {
         "avb_headers",
     ],
     export_header_lib_headers: ["avb_headers"],
-    shared_libs: ["libbase"],
+    shared_libs: ["libbase", "liblog",],
     static_libs: ["libfs_mgr"],
     cflags: [
         "-DAVB_AB_I_UNDERSTAND_LIBAVB_AB_IS_DEPRECATED",
diff --git a/libavb/avb_slot_verify.c b/libavb/avb_slot_verify.c
index 0d75210..0a8b18a 100644
--- a/libavb/avb_slot_verify.c
+++ b/libavb/avb_slot_verify.c
@@ -691,6 +691,7 @@ static AvbSlotVerifyResult load_and_verify_vbmeta(
                NULL);
   }
 
+  LOGI("[load_and_verify_vbmeta] --> read_from partition: %s", full_partition_name);
   io_ret = ops->read_from_partition(ops,
                                     full_partition_name,
                                     vbmeta_offset,
@@ -735,6 +736,7 @@ static AvbSlotVerifyResult load_and_verify_vbmeta(
   /* Check if the image is properly signed and get the public key used
    * to sign the image.
    */
+  LOGI("[load_and_verify_vbmeta] --> avb_vbmeta_image_verify");
   vbmeta_ret =
       avb_vbmeta_image_verify(vbmeta_buf, vbmeta_num_read, &pk_data, &pk_len);
   switch (vbmeta_ret) {
@@ -1481,6 +1483,7 @@ AvbSlotVerifyResult avb_slot_verify(AvbOps* ops,
 
   } else {
     /* Usual path, load "vbmeta"... */
+    LOGI("[avb_slot_verify] --> load_and_verify_vbmeta");
     ret = load_and_verify_vbmeta(ops,
                                  requested_partitions,
                                  ab_suffix,
diff --git a/libavb/avb_util.h b/libavb/avb_util.h
index 3ca84f0..246a32a 100644
--- a/libavb/avb_util.h
+++ b/libavb/avb_util.h
@@ -30,6 +30,7 @@
 #define AVB_UTIL_H_
 
 #include "avb_sysdeps.h"
+#include <android/log.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -38,6 +39,16 @@ extern "C" {
 #define AVB_STRINGIFY(x) #x
 #define AVB_TO_STRING(x) AVB_STRINGIFY(x)
 
+#ifndef MODULE_NAME
+#define MODULE_NAME  "libavb"
+#endif
+
+#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, MODULE_NAME, __VA_ARGS__)
+#define LOGW(...) __android_log_print(ANDROID_LOG_WARN, MODULE_NAME, __VA_ARGS__)
+#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, MODULE_NAME, __VA_ARGS__)
+#define LOGF(...) __android_log_print(ANDROID_LOG_FATAL, MODULE_NAME, __VA_ARGS__)
+
+
 #ifdef AVB_ENABLE_DEBUG
 /* Aborts the program if |expr| is false.
  *
(END)

串口log或者logcat log中输出：

    行 1062: 01-03 04:10:20.879     0     0 I libavb  : [avb_slot_verify] --> load_and_verify_vbmeta
    行 1064: 01-03 04:10:20.896     0     0 I libavb  : [load_and_verify_vbmeta] --> read_from partition: vbmeta_a
    行 1066: 01-03 04:10:20.914     0     0 I libavb  : [load_and_verify_vbmeta] --> avb_vbmeta_image_verify
    行 1068: 01-03 04:10:20.929     0     0 I libavb  : [load_and_verify_vbmeta] --> read_from partition: vbmeta_system_a
    行 1070: 01-03 04:10:20.942     0     0 I libavb  : [load_and_verify_vbmeta] --> avb_vbmeta_image_verify