android marshmallow(6.0) OTA时对cache分区的检查
Android M在 ota_from_target_files里，加了两个：
# Stash size cannot exceed cache_size * threshold.
OPTIONS.cache_size = None
OPTIONS.stash_threshold = 0.8
其中，cache_size会从target_files中的misc_info.txt中读到，这是编译时放进去的。
Change History 说:
# d47d8e14 22-May-2015 Tao Bao
Assert the stash size when generating OTAs.With block-based OTA v2 and v3, it requires stash space on the /cache
partition to back up blocks during an update. We need to ensure that
it doesn't exceed the partition size. Since there might be other files
on /cache as well, we use cache_size * threshold as the maximum allowed
size. The threshold defaults to 0.8, which can be overridden by command
line option '--stash_threshold'.Change-Id: Ieee5d373c9bfb2ea401d85ca8a3adb491579de76
(cherry picked from commit 23ac4042128e47f6fe1ef176e7cb96f907d8e149) 看起来是block OTA用的。
待继，先修BUG去了。
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