Embedded controller, electronic device, and method for filtering spi bus command in relation to write protection

An electronic device comprising:

• a main control module comprising a CPU and a PCH;
• the PCH configured to generate SPI bus commands;
• an SPI storage comprising a BIOS block and an EC FW block;
• the BIOS block;
• the BIOS block configured to store program codes, and the EC FW block configured to store at least one limited SPI bus command;
• and
• an embedded controller configured to connect with PCH through a first interface module, and connect with the SPI storage through a second interface module;
• wherein the embedded controller further comprises an SPI bus command filter module;
• the SPI bus command filter module is capable of switching between an enable mode and a disable mode;
• in the enable mode, the SPI bus command filter module filters the SPI bus command from the main control module based on the at least one limited SPI bus command, and blocks the SPI bus command for performing a written protection of the SPI storage when the SPI bus commands with the at least one limited SPI bus command.

A SPI bus command filter method provided to an electronic device for performing a write protection;

• the electronic device comprising a main control module, an SPI storage, and an embedded controller;
• the embedded controller comprising an SPI bus command filter module;
• the SPI bus command filter module comprising a detection unit and a filter unit;
• the SPI storage comprising a BIOS block and a EC FW block;
• the BIOS block storing operation codes;
• the EC FW block storing at least one limited SPI bus command;
• the SPI bus command filter method comprising:
• initializing the electronic device and generating SPI bus commands by a PCH of the main control module;
• detecting whether a disable jumper is in an enable state;
• outputting an enable control signal when the disable jumper is in a disable state;
• determining whether the SPI bus command comprises the at least one limited SPI bus command based on the enable control signal;
• blocking the SPI bus command when the SPI bus command comprises the at least one limited SPI bus command.