[Buildroot] Custom DTS declaration

[Buildroot] Custom DTS declaration

[Christopher Hunt]

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Hi there,

I’m somewhat confused about the device-tree that I can view from the Linux CLI vs what I’m supplying to buildroot.

If I look at /proc/device-tree/model then I see "Microchip SAMA5D27 WLSOM1 EK”. However, my board/cuprous/gw/linux/dts/at91-sama5d27_wlsom1_cuprous_gw.dts declares, "Microchip SAMA5D27 WLSOM1 Cuprous Gateway”. I’m declaring the use of that DTS via configs/microchip_sama5d27_wlsom1_cuprous_gw_defconfig with:

	BR2_LINUX_KERNEL_INTREE_DTS_NAME="at91-sama5d27_wlsom1_cuprous_gw”
	BR2_LINUX_KERNEL_CUSTOM_DTS_PATH="board/cuprous/gw/linux/dts/at91-sama5d27_wlsom1_cuprous_gw.dts"

Uboot is configured to use its own DTS with the name of "Microchip SAMA5D27 WLSOM1 EK”, so it could be that, or it could just be that I’ve not declared my custom Linux DTS correctly.

Anything obvious?

Full repo here: https://github.com/cuprous-au/buildroot/tree/2022.05.x

Thanks for any help.

Cheers,
-C

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Re: [Buildroot] Custom DTS declaration

[Arnout Vandecappelle via buildroot]

On 14/04/2024 09:40, Christopher Hunt wrote:
> Hi there,
> 
> I’m somewhat confused about the device-tree that I can view from the Linux CLI 
> vs what I’m supplying to buildroot.
> 
> If I look at /proc/device-tree/model then I see "Microchip SAMA5D27 WLSOM1 EK”. 
> However, my board/cuprous/gw/linux/dts/at91-sama5d27_wlsom1_cuprous_gw.dts 
> declares, "Microchip SAMA5D27 WLSOM1 Cuprous Gateway”. I’m declaring the use of 
> that DTS via configs/microchip_sama5d27_wlsom1_cuprous_gw_defconfig with:
> 
> BR2_LINUX_KERNEL_INTREE_DTS_NAME="at91-sama5d27_wlsom1_cuprous_gw”
> BR2_LINUX_KERNEL_CUSTOM_DTS_PATH="board/cuprous/gw/linux/dts/at91-sama5d27_wlsom1_cuprous_gw.dts"

  When specified like this, you will build 2 versions of the DTB:
- one from the kernel sources, arch/arm/boot/dts/sama5d27_wlsom1_cuprous_gw.dts
- one from the Buildroot source,
   board/cuprous/gw/linux/dts/at91-sama5d27_wlsom1_cuprous_gw.dts

They don't have the same basename, so you'll get two DTBs in output/images. My 
guess is that you booted with sama5d27_wlsom1_cuprous_gw..dtb rather than
at91-sama5d27_wlsom1_cuprous_gw.dtb

  Regards,
  Arnout

> 
> Uboot is configured to use its own DTS with the name of "Microchip SAMA5D27 
> WLSOM1 EK”, so it could be that, or it could just be that I’ve not declared my 
> custom Linux DTS correctly.
> 
> Anything obvious?
> 
> Full repo here: https://github.com/cuprous-au/buildroot/tree/2022.05.x 
> <https://github.com/cuprous-au/buildroot/tree/2022.05.x>
> 
> Thanks for any help.
> 
> Cheers,
> -C
> 
> _______________________________________________
> buildroot mailing list
> buildroot@buildroot.org
> https://lists.buildroot.org/mailman/listinfo/buildroot
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Re: [Buildroot] Custom DTS declaration

[Christopher Hunt]

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> On 29 Apr 2024, at 3:23 AM, Arnout Vandecappelle <arnout@mind.be> wrote:
> 
> They don't have the same basename, so you'll get two DTBs in output/images. My guess is that you booted with sama5d27_wlsom1_cuprous_gw..dtb rather than
> at91-sama5d27_wlsom1_cuprous_gw.dtb


Thanks for the reply.

Shouldn’t U-Boot have its own DTS, and the kernel another? That was my expectation, although I am confused about the relationship of DTS files between U-Boot and the kernel.

Cheers,
-C

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