执行buildman --fetch-arch arm提示"urllib2.URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:581)>"如何处理？

答: 在uboot源码的tools/buildman/toolchain.py中取消证书验证，修改内容如下:

diff --git a/tools/buildman/toolchain.py b/tools/buildman/toolchain.py
index a65737fdf8..94877f1047 100644
--- a/tools/buildman/toolchain.py
+++ b/tools/buildman/toolchain.py
@@ -8,6 +8,7 @@ from HTMLParser import HTMLParser
 import os
 import sys
 import tempfile
+import ssl
 import urllib2

 import bsettings
@@ -566,6 +567,7 @@ class Toolchains:
         # Fist get the URL for this architecture
         col = terminal.Color()
         print col.Color(col.BLUE, "Downloading toolchain for arch '%s'" % arch)
+        ssl._create_default_https_context = ssl._create_unverified_context
         url = self.LocateArchUrl(arch)
         if not url:
             print ("Cannot find toolchain for arch '%s' - use 'list' to list" %