HP Classmate Notebook PC Classmate Notebook Maintenance and Service Guide - Page 68

Non-volatile memory usage Non Volatile Memory Type Amount (Size) Real Time Clock (RTC) battery backed-up CMOS configuration memory (CMOS) 256 Bytes Controller (NIC) EEPROM 64 Kbytes (not customer accessible) Does this memory store customer data? No No Keyboard ROM 64 Kbytes No (not customer accessible) DIMM Serial Presence Detect (SPD) configuration data System BIOS 256 Bytes No per memory module, 128 Bytes programma bl e (not customer accessible) 4 to 5 Yes MBytes Intel 1.5 or Yes Management 5MByte Engine Firmware (present only in models ending in a 'p' or 'w' or with Intel Centrino Pro technology) Does this memory retain data when power is removed? What is the purpose of this memory? How is data input into this memory? How is this memory write protected? Yes Stores system Using the F10 Setup utility This memory is not date and time or changing the write-protected. HP and limited Microsoft® Windows® recommends keyboard date & time. password protecting controller the F10 Setup utility. data. Yes Store NIC Using a utility from the A utility is required to configuration NIC vendor that can be run write data to this and NIC from DOS. memory and is firmware. available from NIC vendor. Writing data to this ROM in an inappropriate manner will render the NIC nonfunctional. Yes Stores Programmed at the A utility is required for firmware code factory. Code is updated writing data to this (keyboard, when the system BIOS is memory and is mouse, & updated. available on the HP battery website. Writing data management). to this ROM in an inappropriate manner can render the PC nonfunctional. Yes Stores Programmed by the Data cannot be written memory memory vendor. to this memory when module the module is installed information. in a PC. The specific write protection method varies by memory vendor. Yes Store system System BIOS code is A utility is required for BIOS code and programmed at the writing data to this PC factory. Code is updated memory and is configuration when the system BIOS is available on the HP data. updated. Configuration website. Writing data data and settings are to this ROM in an input using the F10 setup inappropriate manner utility or a custom utility. can render the PC nonfunctional. Yes Stores Management Engine Code The Intel chipset is Management is programmed at the configured to enforce Engine Code, factory. Code is updated HW protection to block Settings, via Intel secure firmware all direct read/write Provisioning update utility. Unique access to this area. An Data and iAMT Provisioning Data can be Intel utility is required third party entered at the factory or for updating the data store. by an administrator using firmware. Only the Management Engine firmware updates (MEBx) setup utility. The digitally signed by 62 Chapter 8 Statement of Volatility