Merge pull request #8 from xqyjlj/dev-fatdisk

修复fatdisk错误

tools/fatdisk/fatdisk.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<fatdisk>
+    <disk_size>65536</disk_size>
+    <sector_size>512</sector_size>
+    <root_dir>root</root_dir>
+    <output>sd.bin</output>
+    <strip>0</strip>
+</fatdisk>
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