Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) * QEMU Firmware Configuration bindings for ARM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) QEMU's arm-softmmu and aarch64-softmmu emulation / virtualization targets
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) provide the following Firmware Configuration interface on the "virt" machine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) type:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) - A write-only, 16-bit wide selector (or control) register,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) - a read-write, 64-bit wide data register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) QEMU exposes the control and data register to ARM guests as memory mapped
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) registers; their location is communicated to the guest's UEFI firmware in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) DTB that QEMU places at the bottom of the guest's DRAM.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) The authoritative guest-side hardware interface documentation to the fw_cfg
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) device can be found in "docs/specs/fw_cfg.txt" in the QEMU source tree.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) Required properties:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) - compatible: "qemu,fw-cfg-mmio".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) - reg: the MMIO region used by the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)   * Bytes 0x0 to 0x7 cover the data register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)   * Bytes 0x8 to 0x9 cover the selector register.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)   * Further registers may be appended to the region in case of future interface
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)     revisions / feature bits.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) Example:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) / {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	#size-cells = <0x2>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	#address-cells = <0x2>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	fw-cfg@9020000 {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		compatible = "qemu,fw-cfg-mmio";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		reg = <0x0 0x9020000 0x0 0xa>;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) };