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Old 04-03-2010, 02:10 PM   #1
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Simple Boot Flag value 0x5 read from CMOS RAM was invalid

Searching syslog to diagnose other problems I encountered this line. As near as I can tell it has nothing to do with any problem I have. I'm just curious as to what it could mean. Does anyone know?
Old 04-03-2010, 02:18 PM   #2
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I think it is caused by a buggy BIOS.
Probably can be ignored.
Old 04-04-2010, 01:30 AM   #3
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A company called 'Microsoft' promulgated a specification for the 'Simple Boot Flag':

Bit 0 indicates that the system has a PNP OS ; Bit 2 indicates that it should run diagnostics at boot time. The BIOS 'owns' the SBF at boot time, so it gets to set it. I assume Linux doesn't mind being identified as a PNP OS, so it must object to being told to run diagnostics.

Usually an OS would clear this bit after it had run diagnostics. Either Linux doesn't clear it or the BIOS keeps on setting it.


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