Am Dienstag, 11. Januar 2022, 01:00:21 CET schrieb Tim Harvey: > [SNIP] > > diff --git a/arch/arm64/boot/dts/freescale/Makefile > > b/arch/arm64/boot/dts/freescale/Makefile index a14a6173b765..5ec8d59347b6 > > 100644 > > --- a/arch/arm64/boot/dts/freescale/Makefile > > +++ b/arch/arm64/boot/dts/freescale/Makefile > > @@ -44,6 +44,9 @@ dtb-$(CONFIG_ARCH_MXC) += imx8mm-var-som-symphony.dtb > > > > dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw71xx-0x.dtb > > dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw72xx-0x.dtb > > dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x.dtb > > > > +dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs232-rts.dtbo > > +dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs422.dtbo > > +dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw73xx-0x-rs485.dtbo > > > > dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw7901.dtb > > dtb-$(CONFIG_ARCH_MXC) += imx8mm-venice-gw7902.dtb > > dtb-$(CONFIG_ARCH_MXC) += imx8mn-beacon-kit.dtb > > > [SNIP] > I'm mostly interested to see if my approach to dt fragments here and > the naming of the files makes sense to others. > > This patch causes the kernel to build dtbo files for: > arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs232-rts.dtbo > arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs422.dtbo > arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-rs485.dtbo > > The intention is that these files are used by boot firmware (U-Boot) > to adjust the dtb before passing it to the kernel. Hi Tim, do these dtbo actually work? I'm wondering because I was trying to useoverlays myself and noticed that the had to be compiled with -@ for u-boot to be able to apply them. Apparently there are 2 possibilities: * Set "DTC_FLAGS_[dtb] := -@" yourself See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ commit/?id=e426d63e752bdbe7d5ba2d872319dde9ab844a07 * Use dedicated overlay target See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ commit/?id=15d16d6dadf6947ac7f9a686c615995c5a426ce2 You use neither of them. IIRC just naming the target file .dtbo will not apply symbols (-Q) during dtc call. Can you verify using 'V=1' Also I'm wondering which way is the best to go. Best regards, Alexander
