解决板卡插入usb摄像头上电，打不开摄像头的问题

liyujie

2025-08-29 87c7c0d90966d729ca3d39cbfca77a39a43960eb

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test: foo bar
 
empty:=
$(empty)
    export A=PASS_A\
with_space
 
foo:
    echo $$A
 
rule:=bar:
$(rule)
    export B=PASS_B; echo $${B}\
without_space