On Thu, 11 Apr 2019, Christoph Hellwig wrote: > On Thu, Apr 11, 2019 at 01:42:59AM -0700, Paul Walmsley wrote: > > Similar to ARM64, add support for building DTB files from DT source > > data for RISC-V boards. > > > > This patch starts with the infrastructure needed for SiFive boards. > > Boards from other vendors would add support here in a similar form. > > What do we build it for? We'd really need something like this: > > http://git.infradead.org/users/hch/misc.git/commitdiff/d6242aa147baf57e05e2932199c74d8d24b9926e > http://git.infradead.org/users/hch/misc.git/commitdiff/0cd5413c8094ab57b68e0629dacfed695f4c1ef1 > > To actually use the DT files. Those patches might be useful - I have not reviewed them closely - but they are not necessary. The FSBL already supplies a DTB to Linux. I assume the U-boot port works the same way. I haven't switched to U-boot yet for these driver tests, so I personally have been using the open-source FSBL (freedom-u540-c000-bootloader) with the following trivial patches applied: https://github.com/sifive/freedom-u540-c000-bootloader/tree/dev/paulw/supply-fsbl-dtb-v5.1-rc4 The fsbl/ux00_fsbl.dtb file can be symlinked to the kernel DTB output, e.g., ~/linux/arch/riscv/boot/dts/sifive/hifive-unleashed-a00-fu540.dtb. - Paul
