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-   -   Simple Boot Flag value 0x5 read from CMOS RAM was invalid (https://www.linuxquestions.org/questions/linux-newbie-8/simple-boot-flag-value-0x5-read-from-cmos-ram-was-invalid-799803/)

RandomTroll 04-03-2010 02:10 PM
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?

smeezekitty 04-03-2010 02:18 PM
I think it is caused by a buggy BIOS.
Probably can be ignored.

RandomTroll 04-04-2010 01:30 AM
A company called 'Microsoft' promulgated a specification for the 'Simple Boot Flag':

http://www.microsoft.com/whdc/resour...pbootspec.mspx

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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