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The remoteproc device is represented as a child node whose >> reg property describes the firmware memory window in the processor-local >> address space. The parent bus node provides standard devicetree address >> translation through ranges so Linux can access the same BRAM through the >> system physical address space. >> >> A clock input feeds the soft-core processor subsystem, and an active-low >> reset GPIO holds the processor in reset until firmware loading >> completes. The firmware-name property is optional. >> >> Signed-off-by: Ben Levinsky >> --- >> .../bindings/remoteproc/amd,bram-rproc.yaml | 98 +++++++++++++++++++ >> 1 file changed, 98 insertions(+) >> create mode 100644 Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml >> >> diff --git a/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml >> new file mode 100644 >> index 000000000000..f16657dc0d9f >> --- /dev/null >> +++ b/Documentation/devicetree/bindings/remoteproc/amd,bram-rproc.yaml >> @@ -0,0 +1,98 @@ >> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) >> +%YAML 1.2 >> +--- >> +$id: http://devicetree.org/schemas/remoteproc/amd,bram-rproc.yaml# >> +$schema: http://devicetree.org/meta-schemas/core.yaml# >> + >> +title: AMD BRAM-based Remote Processor >> + >> +maintainers: >> + - Ben Levinsky >> + >> +description: | >> + Soft-core processor subsystem instantiated in AMD programmable logic and >> + using dual-port BRAM for firmware storage and execution. > > Isn't the soft-core or FPGA still part of some Xilinx SoC? Or is this > completely different thing from SoC and there is a design WITHOUT SoC > using this remote proc? In 99% case this is going to be used on Xilinx SOC with programmable logic next to ARM core. soft core means - means VHDL/Verilog code synthesized to programmable logic/fpga. It means exact location in chip varies based on build and constraints. hard core - physical HW location - like ARM cores in our chip. (ARM is providing RTL/code that even ARM cores in fpga emulated platforms are actually used as soft cores). Not sure if you want me to talk about that 1% use cases which are also possible but don't think anybody will design them. Thanks, Michal