在2024年6月15日六月 下午1:28，Conor Dooley写道： > On Thu, Jun 13, 2024 at 08:40:18PM +0100, Jiaxun Yang wrote: >> >> >> 在2024年6月13日六月 下午7:59，Rob Herring写道： >> > On Wed, Jun 12, 2024 at 05:59:24PM +0100, Jiaxun Yang wrote: >> >> >> >> >> >> 在2024年6月12日六月 下午5:39，Conor Dooley写道： >> >> > On Wed, Jun 12, 2024 at 12:56:26PM +0100, Jiaxun Yang wrote: >> >> >> This compatible is used by boston.dts. >> >> >> >> >> >> Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> >> >> >> --- >> >> >> note: This is a wildcard compatible for all MIPS CPUs, >> >> >> I think we should use something like "riscv" for riscv. >> >> > >> >> > riscv systems, other than simulators etc are not meant to use the >> >> > "riscv" compatible. All of the real CPUs use "vendor,cpu", "riscv". >> >> > I'd suggest you add specific compatibles for your CPUs. >> >> >> >> Boston can be combined with many different CPUs, thus we need to have >> >> such compatibles. >> > >> > Then you'll need different DTs. Different h/w, different DT. >> >> The board have 9 CPU types in total, with hundreds of different possible >> CPU topologies. Maintaining separate DT for them seems impossible in kernel. > > But you could definitely add 9 different compatibles for each of these > different CPUs. They are already in current bindings, but we need a default one to fill in kernel dts. > >> We can potentially patch this in bootloader, but for existing firmware it's >> being doing like this for years. I can see for RISC-V QEMU generated DTB is >> using a single "riscv" compatible and I do think it's a similar problem. > > That "riscv" compatible is only supposed to be used for > simulators/software models. Real CPUs are not meant to use it. AFAICT, > your boston is a real platform, even if the CPUs are implemented on an > FPGA they should still have one. If you take the OpenC906 RISC-V CPU and > put it on an FPGA, you're still meant to put "thead,c906" in your DT. > And sadly, boston is also the platform used by MIPS internal emulators :-( Thanks - Jiaxun > > 附件: > * signature.asc -- - Jiaxun
