HP Pro SFF 290 G9 Desktop PC Maintenance and Service Guide - Page 108
Table 11-1, Troubleshooting steps for nonvolatile memory usage, continued
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Table 11-1 Troubleshooting steps for nonvolatile memory usage (continued) Nonvolatile memory type Amount (Size) Does this memory store customer data? Does this memory retain data when power is removed? What is the purpose of this memory? How is data entered into this memory? How is this memory write-protected? DIMM Serial 256 bytes per No Yes Stores DIMM SPD is programmed Data cannot be written Presence Detect memory memory by the memory vendor. to this memory when (SPD) module, 128 module the module is installed configuration bytes information. in a computer. data programmable The specific write- (not customer protection method accessible) varies by memory vendor. System BIOS 9 MB Yes Yes Stores system BIOS code and computer configuration data. System BIOS code is programmed at the factory. Code is updated when the system BIOS is updated. Configuration data and settings are entered using the Computer Setup (BIOS) or a custom utility. NOTE: Writing data to this ROM in an inappropriate manner can render the computer nonfunctional. A utility must be used for writing data to this memory and is available on the HP website; go to http://www.hp.com/ support. Select Find your product, and then follow the on-screen instructions. Intel 1.5 MB or 7 MB Yes Yes Management Engine Firmware (present only in select Elite or Z models. For more information, go to http://www.hp.com/ support. Select Identify your product for manuals and specific product information, and then follow the on-screen instructions.) Stores Management Engine Code, Settings, Provisioning Data and iAMT thirdparty data store. Management Engine Code is programmed at the factory. Code is updated via Intel secure firmware update utility. Unique Provisioning Data can be entered at the factory or by an administrator using the Management Engine (MEBx) setup utility. The third-party data store contents can be populated by a remote management console or local applications that have been registered by an administrator to have access to the space. The Intel chipset is configured to enforce hardware protection to block all direct readwrite access to this area. An Intel utility must be used for updating the firmware. Only firmware updates digitally signed by Intel can be applied using this utility. Bluetooth flash 2 megabits No Yes Stores Bluetooth flash is A utility must be used (select products Bluetooth programmed at the for writing data to this only) configuration factory. Tools for writing memory and is made and firmware. data to this memory are available through not publicly available but newer versions of can be obtained from the the driver whenever silicon vendor. the flash requires an upgrade. Nonvolatile memory usage 101