HP Chromebook x360 11 G4 Education Edition Maintenance and Service Guide - Page 60
Nonvolatile memory usage
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Nonvolatile memory usage Use this table to troubleshooting nonvolatile memory usage. Table 8-1 Troubleshooting steps for nonvolatile memory usage 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 How is data entered into this How is this memory memory? memory? write-protected? HP Sure Start flash 8 MB (select models only) No Yes Provides Data cannot be written to this This memory is protected protected device via the host processor. by the HP Sure Start backup of The content is managed Embedded Controller. critical System solely by the HP Sure Start BIOS code, EC Embedded Controller. firmware, and critical computer configuration data for select platforms that support HP Sure Start. For more information, see Using HP Sure Start (select products only) on page 55. Real Time Clock 256 bytes No Yes Stores system RTC battery backed-up CMOS This memory is not write- (RTC) battery date and time is programmed using protected. backed-up CMOS and noncritical Computer Setup (BIOS), or by configuration data. changing the Windows date & memory time. Controller (NIC) 64 KB (not No Yes Stores NIC NIC EEPROM is programmed A utility must be used to EEPROM customer configuration using a utility from the NIC write data to this memory accessible) and NIC vendor that can be run from and is available from the firmware. DOS. NIC vendor. Writing data to this ROM in an inappropriate manner will render the NIC non- functional. 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) module, 128 information. module is installed in a configuration 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 52 Chapter 8 Statement of memory volatility