flashrom -p ch341a_spi -r kbc_dump.bin
to handle the two firmware blobs found in factory HP images. Thermal Control Patch : Because the chip is often unrecognized by standard Linux lm-sensors , users often use the NoteBook FanControl (NBFC) tool to manually write to EC registers to control fans. Pinout Configuration (Programmer Mapping) kbc1126nu datasheet patched
If you provide or differences you’re interested in, I can help you: flashrom -p ch341a_spi -r kbc_dump
| Feature | Specification | |-----------------------|---------------------------------------------| | | 8051 @ 25–32 MHz (derived from PLL) | | Flash | 128KB (split into Bank A/B for live update) | | RAM | 4KB + 256B internal | | Host Interface | LPC (Low Pin Count) or SPI | | PS/2 Ports | 2 (Keyboard + Mouse/Touchpad) | | ADC Channels | 8x 10-bit (voltage/temp monitoring) | | PWM Outputs | 4 (fan control, backlight) | | GPIO | Up to 72 pins (multiplexed) | | Special Functions | Battery gas gauge interface, SMBus, LED PWM | Also, pin 37 is not GND—it’s a hidden debug line
Because the official KBC1126-NU datasheet is not widely public, engineers and repair technicians often rely on:
“Rev E swaps registers 0x4F and 0x5C. Also, pin 37 is not GND—it’s a hidden debug line. Pull it low to unlock factory diagnostics.”