Intel C2550 FH8065401488912 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

72

Order Number: 330061-002US

Detected errors are forwarded to the CPU using either an NMI or SMI.

Any error can be mapped to an NMI. However, NMIs are typically used to report fatal 

errors. When an error triggers, an NMI is generated to the CPU.

Any error can be mapped to an SMI. SMIs are typically used to report fatal, non-fatal, 

or correctable error conditions in the SoC. When an error triggers, an SMI is generated 

to the CPU.

Detected errors are forwarded to an external device, a BMC for example, using the 

following active low, three error pins (see 

• ERROR0_B - Correctable errors
• ERROR1_B - Non-fatal errors
• ERROR2_B - Fatal errors

This section provides the necessary details for the operating software to handle 

Machine Check Exceptions (MCE). Some operating systems hook the Machine Check 

Architecture (MCA) exception vector (18h) to allow system-crash analysis. Like some 

other Intel processors, the SoC has been enhanced to allow the machine state to be 

preserved across the assertion of the RESET# signal. The BIOS does not modify the 

MCA registers following the RESET# assertion. This allows the operating system to 

enhance the exception handler by having this information available following a reboot 

after an error has occurred. Only upon the assertion (the signal transition from low to 

high) of the COREPWROK input signal (indicating POWERGOOD, power-on) is the 

machine-check architecture state re-initialized.

All MCA state information is accessible via the Model-Specific Register (MSR) accesses 

using the Read MSR (RDMSR) and Write MSR (WRMSR) instructions. RDMSR and 

WRMSR are described in Volume 2, Chapter 4 of the Intel

Software Developer’s Manual. See 

.

There are three major classifications of MCA MSRs:

1. Global Control registers
2. Error-Reporting Bank registers
3. Extended Machine-Check State registers

The SoC does not have any MCA Extended Machine Check State registers. The first two 

classifications are shown in