mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
38 lines
1.1 KiB
38 lines
1.1 KiB
* QEMU Firmware Configuration bindings for ARM |
|
|
|
QEMU's arm-softmmu and aarch64-softmmu emulation / virtualization targets |
|
provide the following Firmware Configuration interface on the "virt" machine |
|
type: |
|
|
|
- A write-only, 16-bit wide selector (or control) register, |
|
- a read-write, 64-bit wide data register. |
|
|
|
QEMU exposes the control and data register to ARM guests as memory mapped |
|
registers; their location is communicated to the guest's UEFI firmware in the |
|
DTB that QEMU places at the bottom of the guest's DRAM. |
|
|
|
The authoritative guest-side hardware interface documentation to the fw_cfg |
|
device can be found in "docs/specs/fw_cfg.txt" in the QEMU source tree. |
|
|
|
|
|
Required properties: |
|
|
|
- compatible: "qemu,fw-cfg-mmio". |
|
|
|
- reg: the MMIO region used by the device. |
|
* Bytes 0x0 to 0x7 cover the data register. |
|
* Bytes 0x8 to 0x9 cover the selector register. |
|
* Further registers may be appended to the region in case of future interface |
|
revisions / feature bits. |
|
|
|
Example: |
|
|
|
/ { |
|
#size-cells = <0x2>; |
|
#address-cells = <0x2>; |
|
|
|
fw-cfg@9020000 { |
|
compatible = "qemu,fw-cfg-mmio"; |
|
reg = <0x0 0x9020000 0x0 0xa>; |
|
}; |
|
};
|
|
|