Acpi Prp0001

ACPI is a critical component of modern computers, as it enables the operating system to control and interact with hardware components, such as the CPU, memory, and peripherals. The ACPI interface provides a set of rules and protocols that allow hardware and software to communicate with each other, ensuring that the system runs efficiently and reliably.

In some x86 embedded systems, the BIOS vendor provides a minimal ACPI table that lacks IDs for on-board I2C/SPI devices. Instead of waiting for a BIOS update, you can provide a custom SSDT overlay (loaded by the bootloader or the kernel) that adds PRP0001 nodes.

) Name (_CRS, ResourceTemplate () I2cSerialBus (0x19, ControllerInitiated, 100000, AddressingMode7Bit, "\\_SB.PCI0.I2C0", 0x00, ResourceConsumer, , ) GpioInt (Edge, ActiveLow, Exclusive, PullDefault, 0x0000, "\\_SB.PCI0.GIP0", 0, ResourceConsumer, , ) 1 )

Device (TOF1) { Name (_HID, "PRP0001") Name (_DDN, "STMicroelectronics VL53L0X laser rangefinder") Name (_CRS, ResourceTemplate () Stack Overflow Google Chromebook Device (PRP0001) Driver for HP

) Name (_CRS, ResourceTemplate () I2cSerialBus (0x48, ControllerInitiated, 400000, AddressingMode7Bit, "\\_SB.PCI0.I2C0", 0x00, ResourceConsumer, , ) )

This report covers the technical background, use cases, and common troubleshooting steps for the ACPI Hardware ID. Overview of PRP0001

You may encounter PRP0002 in some documentation. This was a brief experiment for a different namespace. In practice, and is fully supported in Linux kernels 3.19 and later. PRP0002 is deprecated and should be avoided.

PRP0001 is a special (HID) that tells the Linux kernel:

Search the kernel source:

Device (LEDS) Name (_HID, "PRP0001") // Special ID to trigger Device Tree matching Name (_DSD, Package () ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), // Standard UUID for properties Package () Package () "compatible", "gpio-leds" // Driver to be loaded ) Use code with caution. Copied to clipboard Source: Linux Kernel Archives and Stack Overflow .

The Device Properties UUID must be exactly: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 . Any typo and the kernel ignores the compatible string.