Hi François, On Tue, 26 Oct 2021 at 00:07, François Ozog <francois.o...@linaro.org> wrote: > > Hi Simon > > Position unchanged on this series: adding fake dts for boards that generate > their device tree in the dts directory is not good. If you have them in > documentation the it is acceptable.
I think we are going to have to disagree on this one. I actually used the qemu one in testing/development recently. We have to have a way to develop in-tree with U-Boot. It does not impinge on any of your use cases, so far as I know. But trying to do any driver / core work for a board where you don't have the devicetree is currently not possible. The devicetree is a core component and being unable to modify it is simply not practical. We are talking here about an option that can be enabled or disabled. In my case I am able to disable it locally and do my development work. BTW I've got the bloblist handoff working with a devicetree inside it, for qemu_arm. I need to try it on a real board to figure out what the difference is. Regards, Simon > > > Cheers > > FF > > Le mar. 26 oct. 2021 à 02:24, Simon Glass <s...@chromium.org> a écrit : >> >> With Ilias' efforts we have dropped OF_PRIOR_STAGE and OF_HOSTFILE so >> there are only three ways to obtain a devicetree: >> >> - OF_SEPARATE - the normal way, where the devicetree is built and >> appended to U-Boot >> - OF_EMBED - for development purposes, the devicetree is embedded in >> the ELF file (also used for EFI) >> - OF_BOARD - the board figures it out on its own >> >> The last one is currently set up so that no devicetree is needed at all >> in the U-Boot tree. Most boards do provide one, but some don't. Some >> don't even provide instructions on how to boot on the board. >> >> The problems with this approach are documented in another patch in this >> series: "doc: Add documentation about devicetree usage" >> >> In practice, OF_BOARD is not really distinct from OF_SEPARATE. Any board >> can obtain its devicetree at runtime, even it is has a devicetree built >> in U-Boot. This is because U-Boot may be a second-stage bootloader and its >> caller may have a better idea about the hardware available in the machine. >> This is the case with a few QEMU boards, for example. >> >> So it makes no sense to have OF_BOARD as a 'choice'. It should be an >> option, available with either OF_SEPARATE or OF_EMBED. >> >> This series makes this change, adding various missing devicetree files >> (and placeholders) to make the build work. >> >> Note: If board maintainers are able to add their own patch to add the >> files, some patches in this series can be dropped. >> >> It also provides a few qemu clean-ups discovered along the way. >> >> Note: This breaks the qemu-riscv64_spl test, which still needs >> investigation. >> >> [1] >> https://patchwork.ozlabs.org/project/uboot/patch/20210919215111.3830278-3-...@chromium.org/ >> >> Changes in v5: >> - Bring into the OF_BOARD series >> - Rebase to master and drop mention of OF_PRIOR_STAGE, since removed >> - Refer to the 'control' DTB in the first paragraph >> - Use QEMU instead of qemu >> - Merge RISC-V and ARM patches since they are similar >> - Add new patches to clean up fdtdec_setup() and surrounds >> >> Changes in v3: >> - Clarify the 'bug' refered to at the top >> - Reword 'This means that there' paragraph to explain U-Boot-specific things >> - Move to doc/develop/devicetree now that OF_CONTROL is in the docs >> >> Changes in v2: >> - Fix typos per Sean (thank you!) and a few others >> - Add a 'Use of U-Boot /config node' section >> - Drop mention of dm-verity since that actually uses the kernel cmdline >> - Explain that OF_BOARD will still work after these changes (in >> 'Once this bug is fixed...' paragraph) >> - Expand a bit on the reason why the 'Current situation' is bad >> - Clarify in a second place that Linux and U-Boot use the same devicetree >> in 'To be clear, while U-Boot...' >> - Expand on why we should have rules for other projects in >> 'Devicetree in another project' >> - Add a comment as to why devicetree in U-Boot is not 'bad design' >> - Reword 'in-tree U-Boot devicetree' to 'devicetree source in U-Boot' >> - Rewrite 'Devicetree generated on-the-fly in another project' to cover >> points raised on v1 >> - Add 'Why does U-Boot have its nodes and properties?' >> - Add 'Why not have two devicetrees?' >> >> Ilias Apalodimas (1): >> sandbox: Remove OF_HOSTFILE >> >> Simon Glass (25): >> doc: Add documentation about devicetree usage >> arm: qemu: Mention -nographic in the docs >> arm: riscv: qemu: Explain how to extract the generated dt >> arm: qemu: Add a devicetree file for qemu_arm >> arm: qemu: Add a devicetree file for qemu_arm64 >> riscv: qemu: Add devicetree files for qemu_riscv32/64 >> arm: rpi: Add a devicetree file for rpi_4 >> arm: vexpress: Add a devicetree file for juno >> arm: xenguest_arm64: Add a fake devicetree file >> arm: octeontx: Add a fake devicetree file >> arm: xilinx_versal_virt: Add a devicetree file >> arm: bcm7xxx: Add a devicetree file >> arm: qemu-ppce500: Add a devicetree file >> arm: highbank: Add a fake devicetree file >> fdt: Make OF_BOARD a bool option >> Drop CONFIG_BINMAN_STANDALONE_FDT >> doc: Update info on devicetree update >> fdt: Move MULTI_DTB_FIT handling out of fdtdec_setup() >> fdt: Drop #ifdefs with MULTI_DTB_FIT >> fdt: Drop CONFIG_SPL_BUILD check in fdtdec_setup() >> fdt: Drop #ifdef around board_fdt_blob_setup() >> fdt: Use if() for fdtcontroladdr check >> fdt: Drop OF_CONTROL check in fdtdec_setup() >> fdt: Drop remaining preprocessor macros in fdtdec_setup() >> fdt: Don't call board_fdt_blob_setup() without OF_BOARD >> >> Makefile | 7 +- >> arch/arm/dts/Makefile | 20 +- >> arch/arm/dts/bcm2711-rpi-4-b.dts | 1958 +++++++++++++++++++++ >> arch/arm/dts/bcm7xxx.dts | 15 + >> arch/arm/dts/highbank.dts | 14 + >> arch/arm/dts/juno-r2.dts | 1038 +++++++++++ >> arch/arm/dts/octeontx.dts | 14 + >> arch/arm/dts/qemu-arm.dts | 402 +++++ >> arch/arm/dts/qemu-arm64.dts | 381 ++++ >> arch/arm/dts/xenguest-arm64.dts | 15 + >> arch/arm/dts/xilinx-versal-virt.dts | 307 ++++ >> arch/powerpc/dts/Makefile | 1 + >> arch/powerpc/dts/qemu-ppce500.dts | 264 +++ >> arch/riscv/dts/Makefile | 2 +- >> arch/riscv/dts/qemu-virt.dts | 8 - >> arch/riscv/dts/qemu-virt32.dts | 217 +++ >> arch/riscv/dts/qemu-virt64.dts | 217 +++ >> arch/sandbox/cpu/cpu.c | 21 +- >> arch/sandbox/include/asm/u-boot-sandbox.h | 8 - >> configs/bcm7260_defconfig | 1 + >> configs/bcm7445_defconfig | 1 + >> configs/highbank_defconfig | 2 +- >> configs/octeontx2_95xx_defconfig | 1 + >> configs/octeontx2_96xx_defconfig | 1 + >> configs/octeontx_81xx_defconfig | 1 + >> configs/octeontx_83xx_defconfig | 1 + >> configs/qemu-ppce500_defconfig | 2 + >> configs/qemu-riscv32_defconfig | 1 + >> configs/qemu-riscv32_smode_defconfig | 1 + >> configs/qemu-riscv32_spl_defconfig | 4 +- >> configs/qemu-riscv64_defconfig | 1 + >> configs/qemu-riscv64_smode_defconfig | 1 + >> configs/qemu-riscv64_spl_defconfig | 3 +- >> configs/qemu_arm64_defconfig | 1 + >> configs/qemu_arm_defconfig | 1 + >> configs/rpi_4_32b_defconfig | 1 + >> configs/rpi_4_defconfig | 1 + >> configs/rpi_arm64_defconfig | 1 + >> configs/sandbox64_defconfig | 2 +- >> configs/sandbox_defconfig | 2 +- >> configs/sandbox_flattree_defconfig | 2 +- >> configs/sandbox_noinst_defconfig | 2 +- >> configs/sandbox_spl_defconfig | 2 +- >> configs/tools-only_defconfig | 2 +- >> configs/vexpress_aemv8a_juno_defconfig | 1 + >> configs/xenguest_arm64_defconfig | 1 + >> configs/xilinx_versal_virt_defconfig | 1 + >> doc/board/emulation/qemu-arm.rst | 10 +- >> doc/board/emulation/qemu-riscv.rst | 3 + >> doc/develop/devicetree/control.rst | 7 +- >> doc/develop/devicetree/dt_qemu.rst | 48 + >> doc/develop/devicetree/dt_update.rst | 498 ++++++ >> doc/develop/devicetree/index.rst | 2 + >> dts/Kconfig | 37 +- >> include/asm-generic/global_data.h | 8 + >> include/fdtdec.h | 21 +- >> lib/fdtdec.c | 116 +- >> scripts/Makefile.spl | 4 +- >> tools/binman/binman.rst | 20 - >> 59 files changed, 5560 insertions(+), 164 deletions(-) >> create mode 100644 arch/arm/dts/bcm2711-rpi-4-b.dts >> create mode 100644 arch/arm/dts/bcm7xxx.dts >> create mode 100644 arch/arm/dts/highbank.dts >> create mode 100644 arch/arm/dts/juno-r2.dts >> create mode 100644 arch/arm/dts/octeontx.dts >> create mode 100644 arch/arm/dts/qemu-arm.dts >> create mode 100644 arch/arm/dts/qemu-arm64.dts >> create mode 100644 arch/arm/dts/xenguest-arm64.dts >> create mode 100644 arch/arm/dts/xilinx-versal-virt.dts >> create mode 100644 arch/powerpc/dts/qemu-ppce500.dts >> delete mode 100644 arch/riscv/dts/qemu-virt.dts >> create mode 100644 arch/riscv/dts/qemu-virt32.dts >> create mode 100644 arch/riscv/dts/qemu-virt64.dts >> create mode 100644 doc/develop/devicetree/dt_qemu.rst >> create mode 100644 doc/develop/devicetree/dt_update.rst >> >> -- >> 2.33.0.1079.g6e70778dc9-goog >> > -- > François-Frédéric Ozog | Director Business Development > T: +33.67221.6485 > francois.o...@linaro.org | Skype: ffozog >
