HP Chromebook 11MK G9 Education Edition Maintenance and Service Guide - Page 64

Table 8-1 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 writeprotected? DIMM Serial 256 bytes per No Yes Stores memory DIMM SPD is programmed by Data cannot be written to Presence Detect memory module the memory vendor. this memory when the (SPD) configuration module, 128 information. module is installed in a data bytes computer. The specific programmable write-protection method (not customer varies by memory vendor. accessible) 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 Management 1.5 MB or 7 MB Yes Yes 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 third-party 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 read-write 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 for (select products Bluetooth programmed at the factory. writing data to this only) configuration Tools for writing data to this memory and is made and firmware. memory are not publicly available through newer available but can be obtained versions of the driver from the silicon vendor. whenever the flash requires an upgrade. 802.11 WLAN 4 kilobits to 8 No Yes Stores 802.11 WLAN EEPROM is A utility must be used for EEPROM kilobits configuration programmed at the factory. writing data to this and calibration Tools for writing data to this memory and is typically data. memory are not made public. not made available to the public unless a firmware upgrade is necessary to address a unique issue. 56 Chapter 8 Statement of memory volatility ENWW