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Intel® Server System Server System "Emerald Ridge ... - CTL

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BMC Flash UpdateIntel® <strong>Server</strong> <strong>System</strong> "<strong>Emerald</strong> <strong>Ridge</strong>” Integrated Baseboard Management Controller EPS5.5 Restore Default ConfigurationThe BMC supports an OEM command, RestoreConfiguration, to restore all configuration valuesto their defaults. All IPMI configuration parameters and all Linux user configuration files (passwd,group, etc.) are restored.When the Restore Configuration command is implemented by the BMC, configuration files arecopied from a read-only default directory (/etc/defconfig) to a standard read-write location (/conf).The SDR and SEL are not restored to defaults by this command, so these two files arepreserved. Standard IPMI commands should be used to clear the SEL and SDR. The IPMIconfiguration file PMConfig.dat is special because it does not exist by default (in which case theBMC uses configuration values from an internal default array), so this file is deleted from /conf.The BMC switches to using RAM shadow copies of the files before copying them to flash,similar to an Operational Firmware Transfer mode update, so the BMC must be reset before itcan use the new values from flash. The reset is completed by the utilities (FWPIAUPD andSysCfg) and not by the BMC for historical reasons.5.6 Fast Firmware Update over USBThe BMC supports a Fast Firmware Update mode in addition to the standard KCS SMSinterface. This is a special AMI proprietary protocol that goes over the USB connection betweenthe host and the BMC. Called “IPMI over USB”, it is implemented in the LIBIPMI library on bothhost and BMC sides to transfer large blocks of data (up to 32 K) much faster than KCS can.Note that block transfer size is independent of USB or KCS interface. IPMI commands areembedded in data written/read to a virtual CD-ROM device. See AMI LIBIPMI documentation fordetails.Update utilities should try to use this method first. If a USB session cannot be established, theupdate utilities should use the standard slower KCS interface. If the BMC is in Boot Recoverymode, only KCS updates are supported.76Intel ConfidentialRevision 1.1

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