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Hello everyone, today we are going to learn how to brush EC firmware
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This lesson is divided into three parts
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Introduction of EC firmware, the tools required for brushing EC firmware
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and the process for brushing EC firmware
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First let's take a look at the EC firmware
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Firmware refers to binary programs that can be engraved,
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such as BIOS, EC programs, and so on
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The EC firmware is also called the EC program
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It is one of the basic working conditions of the EC
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It is usually stored inside the EC or in the flash chip outside the EC through the SPI bus
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There are four common storage architectures
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The first, the EC program is stored in the flash chip under the EC,
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which is stored with the main BIOS and connected through the SPI bus
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The second method is that the EC chip has built-in programs
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Third, there is a flash chip attached to the EC through the SPI bus, which is used to store the EC ROM
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It is not put together with the main BIOS
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In the fourth architecture, the EC and the chipset share a flash chip, which is connected through the SPI bus
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In the first, third and fourth architectures,
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when we brush the EC program, we brush the BIOS along with it
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Here we mainly introduce the second architecture,
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how do we brush the program stored in the EC
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First, we need some tools
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There are different conversion boards according to the EC models
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Such as IT8586, IT8587, and NPCE288, NPCE388 and so on, and KB9012
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These chips support offline writing and online writing
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We also need a programmer
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Okay, so let's look at the brush steps
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We take KB9012 as an example to introduce the offline brush method
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Because we commonly use offline brushing method
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The first step is to solder some components to the conversion board
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For example, here we have capacitors C1, C2, C3 and C4
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Solder these capacitors as required,
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and a 47K or 51K resistor should be welded to the position of R1
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In the second step, we solder the EC to the conversion board
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and attach the conversion board to the programmer
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In the third step,
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we open the programmer software and type KB9012 in the input chip model area
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Click OK
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and then click Read
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Be sure to read and back up first
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After the backup is good, find a new EC program to write into it
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This operation process is relatively simple
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This is how to brush EC program,
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in fact, it is the same as the method of brushing the BIOS in the previous course
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The only difference is that we need a dedicated conversion board
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Okay, this is how to brush EC firmware
