162
Figure 9-5
2
Fan Speed Control
9.22.2 Fan Speed Control (FSC) Watchdog
MCU or CPLD will monitor BMC fan control task by receiving BMC watchdog signal.
If MCU or CPLD cannot receive watchdog signal in 4 mins, all fans will be set to full speed to
avoid system overheating.
9.23 Firmware Update
9.23.1 BMC Firmware Update
BMC supports dual BMC firmware image. BMC flash contains two images (BMC flash size is
64M, BMC firmware image size is 32M).
Supported update modes:
●
WEB update, users login Web GUI and enter flash page to update firmware. This is a
sideband mode, it supports Firmware Integrity Checking and preserving configuration. It is a
suggested update mode.
●
SOCflash tool update, SOCflash tool is used in DOS/Windows/Linux OS. SOCflash will
directly erase and overwrite flash with new image without Firmware Integrity Checking. All
configuration will be erased. This is an inband mode, users should accept user permission.
SOCflash is disabled by default. We strongly don’t suggest customer to use SOCflash tool for
security.
9.23.1.1 Firmware Integrity Checking
Each firmware image has a MD5 code calculated by MD5 tool (Hash.exe). Before firmware
update, users must check integrity using MD5 tool to make sure the firmware image file is