Updating escd nvram protected
A segment selector serves as a pointer to a segment descriptor for an ESCD area of non-volatile storage.
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If the non-volatile storage is memory-mapped, the physical base address of the memory mapped non-volatile storage allows a "caller," such as an operating system, to construct a segment descriptor pointed to by a memory pointer known as a segment selector.
The SMI code then flashes the ROM image in the ESCD runtime buffer into the ESCD sector to save the ESCD data or variable provided by the write operation. Field of the Invention The present invention relates to read-only-memory (ROM) flashing, and more particularly to a method for flashing Extended System Configuration Data (ESCD) and variables into a ROM of a computer system. Description of the Related Art In order to support the automatic configuration of Plug and Play devices on platforms that include a standard expansion bus, non-volatile storage such as CMOS RAM, ROM, or NVRAM is used to store information about system resources used by non-Plug and Play devices in a computer system.
This configuration information is typically stored in an Extended System Configuration Data (ESCD) format.
During Power-On-Self-Test (POST) code, a ROM image is copied from an ESCD sector of a read-only memory to an ESCD original buffer and an ESCD write buffer. Following the POST operations, the contents of the ESCD write buffer are copied to an ESCD runtime buffer.
The contents of the ESCD original buffer or the ESCD sector are compared to the contents of the ESCD runtime buffer.
POST is then exited and the computer system is booted.