Re: How to use device tree in x86_64

[Mehran Memarnejad]

I have done some searches on google. I need more direct help to get things
work

On Thursday, December 5, 2024, Randy Goldenberg <randy.goldenberg@gmail.com>
wrote:

> https://www.google.com/search?q=Building+Grub+from+source+
> with+device+tree+support
>
> On Wed, Dec 4, 2024 at 5:18 AM Mehran Memarnejad <memarnejadm74@gmail.com>
> wrote:
>
>> Hi,
>> I have a requirement in which I need to use the same approach uboot uses
>> in
>> ARM platforms. I know it's uncommon to do so in x86_64 as devices are hot
>> pluggable (connected by usb and pcie), But I need it for my requirement.
>> I want to use device tree with *grub* in *x86_64* and pass it to *linux*
>> kernel in *ubuntu*
>>
>> Technically, I have a minimal device tree as following:
>>
>> /dts-v1/;
>>
>> / {
>>     model = "Custom x86 Platform";
>>
>>     soc@0 {
>> #address-cells = <1>;
>> #size-cells = <1>;
>>
>>         simple_platform_device@0 {
>>             compatible = "simple,platform-device";    // Driver matching
>> string
>>             reg = <0x0 0x0>;
>>         };
>>     };
>> };
>>
>> The primary goal is to call probe function of the corresponding platform
>> device driver which has the same compatible string.
>> Searching about device tree support in grub on x86, I found some results
>> but could not get it to work. I guess I need to do the following:
>> 1) Enable Kernel Device Tree Support (CONFIG_OF) [Already Done]
>> 2) Building Grub from source with device tree support [HOW?]
>> 3) Edit grub config file to insert device tree dtb path [HOW?]
>>
>> The above items (2 and 3) are my questions
>> Thanks in advance for your help
>>
>