On Tue, 29 Oct 2019 at 18:17, Prabhakar Kushwaha
<prabhakar.p...@gmail.com> wrote:
>
> 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?
>
Neither. It is created by Linux itself.
> 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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