我记着在doc上面看，是不可以直接删除的。
boardusage.log
boardusage.log.0
boardusage.log.1
boardusage.log.10
boardusage.log.11
boardusage.log.12
boardusage.log.13
boardusage.log.14
boardusage.log.15
boardusage.log.16
boardusage.log.17
boardusage.log.18
boardusage.log.19
boardusage.log.2
boardusage.log.20
boardusage.log.3
boardusage.log.4
boardusage.log.5
boardusage.log.6
boardusage.log.7
boardusage.log.8
boardusage.log.9

还有：
sysconf.img.0
sysconf.img.1
sysconf.img.2
sysconf.img.3
sysconf.img.4
sysconf.img.5
sysconf.img.6
sysconf.img.7
sysconf.img.8
sysconf.img.9

他们都是备份文件吧~~
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