Why can't /dev/ipmi0 on host be created stably

[xiuzhi]

Hi All,
   I am testing the bmc ipmi-kcs reliability.
   The /dev/ipmi0 on host will not  be available  in several consecutive bmc reboot test.  The CA3 value is 0x04 which can be got by the command "mm -io ca3" on host bios shell when failing to create the ipmi0  .
The CA3 value 0x04 means that SMS_ATN is set to 1, which meas:
"Set to 1 when the BMC has one or more messages in the Receive Message Queue, or when a watchdog timer pre-timeout, or event message buffer full condition exists [2] . OEMs may also elect to set this flag is one of the OEM 1, 2,or 3 flags from the Get Message Flags command becomes set. R/O This bit is related to indicating when the BMC is the source of a system interrupt. Refer to sections 9.12, KCS Communication and Non-communication , 9.13, Physical Interrupt Line Sharing, and 9.14, Additional Specifications for the KCS interface for additional information on the use and requirements for the SMS_ATN bit."

 see the Table 9-, KCS Interface Status Register Bits in section 9.7 of  Intelligent Platform ManageBment Interface Specification .
   What  causes this problem?
 Best,
Xiuzhi
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