On Sun, Apr 06, 2025 at 07:07:04AM +1200, Simon Glass wrote: > At present it is impossible to change the qemu_arm64 defconfig to > obtain a devicetree from the U-Boot build. > > This is necessary for FIT validation, for example, where the signature > node must be compiled into U-Boot. > > A proposed change to QEMU to allow device tree additions has been > blocked for several years. The only known workaround is to use QEMU's > dumpdtb option, merge in the signature node manually, disable > OF_HAS_PRIOR_STAGE and then start QEMU with special arguments. This is > complicated enough that it is documented in U-Boot[1].
This paragraph and then [snip] > + Note: this work-around is necessary since Linaro has blocked > + addition of a feature to support additions to the QEMU devicetree: This part of the help are overly antagonistic. [snip] > diff --git a/dts/Kconfig b/dts/Kconfig > index 2e88d210bb8..53f7e246a80 100644 > --- a/dts/Kconfig > +++ b/dts/Kconfig > @@ -205,8 +205,13 @@ config OF_HAS_PRIOR_STAGE > development purposes, but it is not recommended, and likely will not > even work, for production systems. > > - Note: This option must be set in Kconfig and cannot be enabled or > - disabled in the board's defconfig file. > + Note: This option can be disabled for QEMU usiing QEMU_MANUAL_DTB thus > + allowing QEMU to support FIT validation, where the devicetree must > + include a public key. > + > + See also this for context: > + > + > https://patchwork.kernel.org/project/qemu-devel/patch/20210926183410.256484-1-...@chromium.org/#24481799 And we don't need more wording here. The QEMU_MANUAL_DTB option itself is enough. -- Tom
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