[Buildroot] [PATCH 1/2] rpi-firmware: allow disabling installation of binary DTBs

[Yann E. MORIN <yann.morin.1998@free.fr>]

Floris, All,

On 2015-06-19 22:52 +0200, Floris Bos spake thusly:
> On 06/19/2015 10:30 PM, Yann E. MORIN wrote:
> >+config BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTBS
> >+	bool "Install Device Tree Blobs (DTBs)"
> >+	default "y"
> >+	help
> >+	  Say 'y' here if you want to install the binary DTB files which
> >+	  are suitable for a rpi-3.18.y branch Linux kernel.
> >+
> >+	  Say 'n' here if you intend to compile the device tree files
> >+	  from kernel source instead.
> >I would rephrase that as:
> >
> >     If you are using a Linux kernel <= 3.18, you should say 'y' here.
> >
> >     If you are using a Linux kernel >= 3.19, you should say 'n' here,
> >     and enable BR2_LINUX_KERNEL_DTS_SUPPORT to let the kernel build
> >     the DTB.
> 
> Rephrashing is fine with me.

OK, thanks.

> >  endif # BR2_PACKAGE_RPI_FIRMWARE
> >diff --git a/package/rpi-firmware/rpi-firmware.mk b/package/rpi-firmware/rpi-firmware.mk
> >index cbcf790..9cccb38 100644
> >--- a/package/rpi-firmware/rpi-firmware.mk
> >+++ b/package/rpi-firmware/rpi-firmware.mk
> >@@ -13,6 +13,7 @@ RPI_FIRMWARE_INSTALL_IMAGES = YES
> >  RPI_FIRMWARE_DEPENDENCIES += host-rpi-firmware
> >+ifeq ($(BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTBS),y)
> >  define RPI_FIRMWARE_INSTALL_DTB
> >  	$(INSTALL) -D -m 0644 $(@D)/boot/bcm2708-rpi-b.dtb $(BINARIES_DIR)/rpi-firmware/bcm2708-rpi-b.dtb
> >  	$(INSTALL) -D -m 0644 $(@D)/boot/bcm2708-rpi-b-plus.dtb $(BINARIES_DIR)/rpi-firmware/bcm2708-rpi-b-plus.dtb
> >@@ -21,6 +22,7 @@ define RPI_FIRMWARE_INSTALL_DTB
> >  		$(INSTALL) -D -m 0644 $${ovldtb} $(BINARIES_DIR)/rpi-firmware/overlays/$${ovldtb##*/} || exit 1; \
> >  	done
> >  endef
> >+endif
> >I'd put the overlays out of the conditional block, because they are
> >*not* built by the Linux kernel.
> 
> They do seem to be part of the rpi Linux source tree:
> https://github.com/raspberrypi/linux/tree/rpi-3.18.y/arch/arm/boot/dts/overlays

Ah, indeed. I was mislead by looking at the rpi-4.0.y branch, which does
not have that sub-directory. But looking further, the overlays are all
along side the standard DTS, not in a sub-directory.

I'll see what I can do with that.

> Isn't it a matter of adding overlay/name-of-overlay to
> BR2_LINUX_KERNEL_INTREE_DTS_NAME if someone wants an overlay build?

It would seem so. I'll test that.

Thanks for the tips! :-)

Regards,
Yann E. MORIN.

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