[edk2-devel] How /sys/firmware/fdt getting created

[Prabhakar Kushwaha]

Hi All,

I am working on Ubuntu-18.04 with UEFI on ARM64(64 bit) platform. The
UEFI used is having ACPI tables.

I am trying to understand where and how /sys/firmware/fdt is getting
created. is it created by UEFI or grub and passed to Linux?

below is the dts format of /sys/firmware/fdt.

/dts-v1/;

/ {

	chosen {
		linux,uefi-mmap-desc-ver = <0x1>;
		linux,uefi-mmap-desc-size = <0x30>;
		linux,uefi-mmap-size = <0xcc0>;
		linux,uefi-mmap-start = <0x0 0xeda13018>;
		linux,uefi-system-table = <0x0 0xfafd0018>;
		bootargs = "BOOT_IMAGE=/boot/vmlinuz-5.4.0-rc4+
root=UUID=798a858c-4f20-4b99-aa40-99bff9394093 ro crashkernel=2G
console=ttyAMA0";
		linux,initrd-end = <0x0 0xeb381a34>;
		linux,initrd-start = <0x0 0xdd5f5000>;
	};
};

also, under what scenario/config fields is getting added fdt.
	#size-cells = <0x02>;
	#address-cells = <0x02>;

--prabhakar (pk)

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