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An Error Occurs During OS Startup Due to the CMOS Modified by the Kernel

Publication Date:  2015-06-19 Views:  72 Downloads:  0
Issue Description
The "CMOS Checksum Bad" message is displayed during the power on self-test (POST) of the RH2285. The basic input/output system (BIOS) information modified by the kernel is lost, as shown in Figure 1.

Figure 1 Error message during the POST

Handling Process
1.  The problem persists each time the server is restarted.

2.  Check the baseboard management controller (BMC) logs reported by the onsite personnel and find that the complementary metal-oxide-semiconductor (CMOS) error is recorded in the BMC log, as shown in Figure 2.

Figure 2 BMC log



3.  Confirm that the CMOS is modified by the OS kernel based on service requirements after communication with the onsite personnel.
Root Cause
The system checks the CMOS during startup. If the checksum cannot pass, an error message is displayed, and the system reloads the default BIOS settings.

The OS kernel modifies the CMOS, which results in an error displayed during OS startup.



Solution
Install a standard OS. Do not modify the CMOS in the kernel except under specific conditions.

Suggestions
If the "CMOS CheckSum Bad" message is displayed, the BIOS settings may be incorrect, the time may not be set, or the mainboard batter runs out of power. If the message is displayed each time the OS is restarted, the CMOS is modified by the OS kernel. If the problem occurs, check with the customer whether the OS is a standard version or is customized onsite.

END