Intel PCH-LP, Programming Manual

Page: 67 / 90

523462 67
Intel Confidential
Recommendations for SPI Flash Programming in Manufacturing Environments
11 Recommendations for SPI Flash
Programming in Manufacturing
Environments
It is recommended that the Intel
®
ME be disabled when you are programming the ME
region. Intel
®
ME FW performs regular writes/erases to the ME region. Therefore some
bits may be changed after programming. Please note that not all of these options will
be optimal for your manufacturing process.
Any method of programming SPI flash where the system is not powered will
not result in any interference from Intel
®
ME FW. The following methods are
for Intel
®
ME FW:
• Program via In Circuit Test – System is not fully powered here.
• Program via external flash burn-in solution.
• Disable the Intel
®
ME through the BIOS/Intel
®
MEBX before programming fixed
offset variables (FOV) into the non-volatile memory area, or before any operation
that depends on the base address for fixed variable offsets remaining constant.
• Assert HDA_SDO HIGH (Flash Descriptor Override Jumper) on the rising edge of
PWROK. Note: this is only valid as long as you do not specifically disable this
functionality in fixed offset variable.
§ §