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Message-ID: <CAL_Jsq+gYJRuCroCm2BDrEY2TjFV7cG9WcUr0nEZfBsrgzruTg@mail.gmail.com> Date: Wed, 21 Oct 2015 20:11:59 -0500 From: Rob Herring <robh+dt@...nel.org> To: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com> Cc: Ralf Baechle <ralf@...ux-mips.org>, Linux-MIPS <linux-mips@...ux-mips.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org> Subject: Re: [PATCH_V2 1/4] dt-bindings: MIPS: Document xilfpga bindings and boot style On Tue, Oct 20, 2015 at 11:30 AM, Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com> wrote: > Xilfpga boots only with device-tree. Document the required properties > and the unique boot style > > Signed-off-by: Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com> > > --- > V1->V2 > > Reformatted to 80 char column > Correct clock phandle description > Added digilent,nexys4ddr to get more specific about platform > Added compatible string in example. > --- > .../devicetree/bindings/mips/img/xilfpga.txt | 83 ++++++++++++++++++++++ > 1 file changed, 83 insertions(+) > create mode 100644 Documentation/devicetree/bindings/mips/img/xilfpga.txt > > diff --git a/Documentation/devicetree/bindings/mips/img/xilfpga.txt b/Documentation/devicetree/bindings/mips/img/xilfpga.txt > new file mode 100644 > index 0000000..eaba22b > --- /dev/null > +++ b/Documentation/devicetree/bindings/mips/img/xilfpga.txt > @@ -0,0 +1,83 @@ > +Imagination University Program MIPSfpga > +======================================= > + > +Under the Imagination University Program, a microAptiv UP core has been > +released for academic usage. > + > +As we are dealing with a mips core instantiated on an FPGA, specifications s/mips/MIPS/ > +are fluid and can be varied in RTL. > + > +This binding document is provided as baseline guidance for the example > +project provided by IMG. > + > +The example project runs on the Nexys4DDR board by Digilent powered by > +the ARTIX-7 FPGA by Xilinx. > + > +Relevant details about the example project and the Nexys4DDR board: > + > +- microAptiv UP core m14Kc > +- 50MHz clock speed > +- 128Mbyte DDR RAM at 0x0000_0000 > +- 8Kbyte RAM at 0x1000_0000 > +- axi_intc at 0x1020_0000 > +- axi_uart16550 at 0x1040_0000 > +- axi_gpio at 0x1060_0000 > +- axi_i2c at 0x10A0_0000 > +- custom_gpio at 0x10C0_0000 > +- axi_ethernetlite at 0x10E0_0000 > +- 8Kbyte BootRAM at 0x1FC0_0000 > + > +Required properties: > +-------------------- > + - compatible: Must include "img,xilfpga","digilent,nexys4ddr". Should be in the reverse order. Most specific comes first. > + > +CPU nodes: > +---------- > +A "cpus" node is required. Required properties: > + - #address-cells: Must be 1. > + - #size-cells: Must be 0. > +A CPU sub-node is also required for at least CPU 0. Required properties: > + - device_type: Must be "cpu". > + - compatible: Must be "mips,m14Kc". > + - reg: Must be <0>. > + - clocks: phandle to ext clock for fixed-clock received by MIPS core. > + > +Example: > + > + compatible = "img,xilfpga","digilent,nexys4ddr"; > + cpus { > + #address-cells = <1>; > + #size-cells = <0>; > + > + cpu0: cpu@0 { > + device_type = "cpu"; > + compatible = "mips,m14Kc"; > + reg = <0>; > + clocks = <&ext>; > + }; > + }; > + > + ext: ext { > + compatible = "fixed-clock"; > + #clock-cells = <0>; > + clock-frequency = <50000000>; > + }; > + > +Boot protocol: > +-------------- > + > +The BootRAM is a writeable "RAM" in FPGA at 0x1FC0_0000. > +This is for easy reprogrammibility via JTAG. > + > +The BootRAM inializes the cache and the axi_uart peripheral. typo > + > +DDR initialiation is already handled by a HW IP block. typo > + > +When the example project bitstream is loaded, the cpu_reset button > +needs to be pressed. > + > +The bootram initializes the cache and axi_uart. > +Then outputs MIPSFPGA\n\r on the serial port on the Nexys4DDR board. > + > +At this point, the board is ready to load the Linux kernel > +vmlinux file via JTAG. > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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