[PATCH 2/2] bsps/riscv: add riscv/kendrytek210 BSP variant

Alan Cudmore alan.cudmore at gmail.com
Mon Mar 13 21:28:28 UTC 2023


On Mon, Mar 13, 2023 at 12:16 PM Gedare Bloom <gedare at rtems.org> wrote:

> On Mon, Mar 13, 2023 at 9:53 AM Alan Cudmore <alan.cudmore at gmail.com>
> wrote:
> >
> > Thanks for taking a look. Comments below.
> >
> > On Mon, Mar 13, 2023 at 11:04 AM Gedare Bloom <gedare at rtems.org> wrote:
> >>
> >> On Thu, Mar 9, 2023 at 8:48 PM Alan Cudmore <alan.cudmore at gmail.com>
> wrote:
> >> >
> >> > This patch set adds support for the Kendryte K210 RISC-V BSP variant.
> >> > The SoC uses existing PLIC, Timer, and console UART. It only needs
> >> > SoC specific initalization and an embedded device tree binary similar
> >> > to the polarfire SoC BSP.
> >> >
> >> > Updates #4876
> >> > ---
> >> >  bsps/riscv/riscv/config/kendrytek210.cfg      |   9 +
> >> >  bsps/riscv/riscv/console/console-config.c     |  10 +-
> >> >  bsps/riscv/riscv/console/fe310-uart.c         |   2 +-
> >> >  bsps/riscv/riscv/dts/kendryte-k210.dts        | 216 ++++++++++++
> >> >  bsps/riscv/riscv/include/bsp.h                |   4 +
> >> >  bsps/riscv/riscv/include/bsp/k210.h           |  91 +++++
> >> >  .../riscv/include/bsp/kendryte-k210-dtb.h     | 315
> ++++++++++++++++++
> >> >  bsps/riscv/riscv/include/bsp/riscv.h          |   4 +
> >> >  bsps/riscv/riscv/start/bspstart.c             |  42 +++
> >> >  9 files changed, 687 insertions(+), 6 deletions(-)
> >> >  create mode 100644 bsps/riscv/riscv/config/kendrytek210.cfg
> >> >  create mode 100644 bsps/riscv/riscv/dts/kendryte-k210.dts
> >> >  create mode 100644 bsps/riscv/riscv/include/bsp/k210.h
> >> >  create mode 100644 bsps/riscv/riscv/include/bsp/kendryte-k210-dtb.h
> >> >
> >> > diff --git a/bsps/riscv/riscv/config/kendrytek210.cfg
> b/bsps/riscv/riscv/config/kendrytek210.cfg
> >> > new file mode 100644
> >> > index 0000000000..b04e78b0e9
> >> > --- /dev/null
> >> > +++ b/bsps/riscv/riscv/config/kendrytek210.cfg
> >> > @@ -0,0 +1,9 @@
> >> > +include $(RTEMS_ROOT)/make/custom/default.cfg
> >> > +
> >> > +RTEMS_CPU = riscv
> >> > +
> >> > +CPU_CFLAGS = -march=rv64imafdc -mabi=lp64d -mcmodel=medany
> >> > +
> >> > +LDFLAGS = -Wl,--gc-sections
> >> > +
> >> > +CFLAGS_OPTIMIZE_V ?= -O2 -g -ffunction-sections -fdata-sections
> >> > diff --git a/bsps/riscv/riscv/console/console-config.c
> b/bsps/riscv/riscv/console/console-config.c
> >> > index 4916191e0b..72743fe9d5 100644
> >> > --- a/bsps/riscv/riscv/console/console-config.c
> >> > +++ b/bsps/riscv/riscv/console/console-config.c
> >> > @@ -55,7 +55,7 @@
> >> >  #include <libfdt.h>
> >> >  #include <string.h>
> >> >
> >> > -#if RISCV_ENABLE_FRDME310ARTY_SUPPORT != 0
> >> > +#if RISCV_ENABLE_SIFIVE_UART_SUPPORT != 0
> >> >  #include <bsp/fe310-uart.h>
> >> >  static fe310_uart_context fe310_uart_instance;
> >> >  #endif
> >> > @@ -239,7 +239,7 @@ static void riscv_console_probe(void)
> >> >      }
> >> >  #endif
> >> >
> >> > -#if RISCV_ENABLE_FRDME310ARTY_SUPPORT != 0
> >> > +#if RISCV_ENABLE_SIFIVE_UART_SUPPORT != 0
> >> >      if (fdt_stringlist_contains(compat, compat_len, "sifive,uart0"))
> {
> >> >        fe310_uart_context *ctx;
> >> >
> >> > @@ -255,7 +255,7 @@ static void riscv_console_probe(void)
> >> >          riscv_console.getchar = fe310_uart_read;
> >> >        }
> >> >
> >> > -      rtems_termios_device_context_initialize(&ctx->base,
> "FE310UART");
> >> > +      rtems_termios_device_context_initialize(&ctx->base,
> "SIFIVEUART");
> >> >      }
> >> >  #endif
> >> >
> >> > @@ -290,7 +290,7 @@ rtems_status_code console_initialize(
> >> >    size_t i;
> >> >  #endif
> >> >
> >> > -#if RISCV_ENABLE_FRDME310ARTY_SUPPORT != 0
> >> > +#if RISCV_ENABLE_SIFIVE_UART_SUPPORT != 0
> >> >    fe310_uart_context *ctx;
> >> >    char fe310_path[] = "/dev/ttyS0";
> >> >  #endif
> >> > @@ -326,7 +326,7 @@ rtems_status_code console_initialize(
> >> >    }
> >> >  #endif
> >> >
> >> > -#if RISCV_ENABLE_FRDME310ARTY_SUPPORT != 0
> >> > +#if RISCV_ENABLE_SIFIVE_UART_SUPPORT != 0
> >> >    ctx = &fe310_uart_instance;
> >> >    rtems_termios_device_install(
> >> >      fe310_path,
> >> > diff --git a/bsps/riscv/riscv/console/fe310-uart.c
> b/bsps/riscv/riscv/console/fe310-uart.c
> >> > index 506521add0..ddabcff4c8 100644
> >> > --- a/bsps/riscv/riscv/console/fe310-uart.c
> >> > +++ b/bsps/riscv/riscv/console/fe310-uart.c
> >> > @@ -53,7 +53,7 @@ static void fe310_uart_write (
> >> >    fe310_uart_context * ctx = (fe310_uart_context*) base;
> >> >    size_t i;
> >> >
> >> > -  ctx->regs->div = riscv_get_core_frequency() / 115200 - 1;
> >> > +  ctx->regs->div = (riscv_get_core_frequency() / 115200 - 1) &
> 0xFFFF;
> >> >    ctx->regs->txctrl |= 1;
> >> >    ctx->regs->rxctrl |= 1;
> >> >
> >> > diff --git a/bsps/riscv/riscv/dts/kendryte-k210.dts
> b/bsps/riscv/riscv/dts/kendryte-k210.dts
> >> > new file mode 100644
> >> > index 0000000000..379aaf01a3
> >> > --- /dev/null
> >> > +++ b/bsps/riscv/riscv/dts/kendryte-k210.dts
> >> > @@ -0,0 +1,216 @@
> >> > +/* SPDX-License-Identifier: BSD-2-Clause */
> >> > +
> >> > +/*
> >> > + * Copyright (C) Alan Cudmore
> >> > + * Copyright (C) Padmarao Begari
> >> > + * Copyright (C) 2022 Microchip Technology Inc.
> >> > + *
> >> > + * Redistribution and use in source and binary forms, with or without
> >> > + * modification, are permitted provided that the following conditions
> >> > + * are met:
> >> > + * 1. Redistributions of source code must retain the above copyright
> >> > + *     notice, this list of conditions and the following disclaimer.
> >> > + * 2. Redistributions in binary form must reproduce the above
> copyright
> >> > + *     notice, this list of conditions and the following disclaimer
> in the
> >> > + *     documentation and/or other materials provided with the
> distribution.
> >> > + *
> >> > + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
> CONTRIBUTORS "AS IS"
> >> > + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
> TO, THE
> >> > + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
> PARTICULAR PURPOSE
> >> > + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
> CONTRIBUTORS BE
> >> > + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
> OR
> >> > + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
> OF
> >> > + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
> BUSINESS
> >> > + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
> WHETHER IN
> >> > + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
> OTHERWISE)
> >> > + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
> ADVISED OF THE
> >> > + * POSSIBILITY OF SUCH DAMAGE.
> >> > + */
> >> > +
> >> > + /* This is a device tree for the Kendryte K210 SoC. It is a
> simplified tree
> >> > +  * to support the current RTEMS BSP, but it is not sufficient
> enough for
> >> > +  * full linux or u-boot support.
> >> > +  * The file structure is based on the device tree source for the
> >> > +  * Polarfire SoC created by Padmaro Begari. The K210 device trees
> from
> >> > +  * u-boot were originally used to bring up the RTEMS BSP and were
> >> > +  * referenced to develop this file.
> >> > +  */
> >> > +
> >> > +/dts-v1/;
> >> > +
> >> > +/ {
> >> > +        /* 32 bit address bus - upper 32 bits are ignored */
> >> > +       #address-cells = <1>;
> >> > +       #size-cells = <1>;
> >> > +
> >> > +       model = "Kendtryte K210 generic";
> >> > +       compatible = "canaan,kendryte-k210";
> >> > +
> >> > +       aliases {
> >> > +               serial0 = &uarths0;
> >> > +               serial1 = &uart1;
> >> > +               /* serial2 = &uart2; */
> >> > +               /* serial3 = &uart3; */
> >> > +       };
> >> > +
> >> > +       chosen {
> >> > +               stdout-path = "serial0";
> >> > +       };
> >> > +
> >> > +       cpus {
> >> > +               #address-cells = <1>;
> >> > +               #size-cells = <0>;
> >> > +
> >> > +               timebase-frequency = <7800000>;
> >> > +
> >> > +               cpu0: cpu at 0 {
> >> > +                       compatible = "canaan,k210", "riscv";
> >> > +                       device_type = "cpu";
> >> > +                       reg = <0>;
> >> > +                       riscv,isa = "rv64imafdc";
> >> > +                       i-cache-block-size = <64>;
> >> > +                       i-cache-size = <0x8000>;
> >> > +                       d-cache-block-size = <64>;
> >> > +                       d-cache-size = <0x8000>;
> >> > +                       cpu0_intc: interrupt-controller {
> >> > +                               #interrupt-cells = <1>;
> >> > +                               compatible = "riscv,cpu-intc";
> >> > +                               interrupt-controller;
> >> > +                       };
> >> > +               };
> >> > +               cpu1: cpu at 1 {
> >> > +                       compatible = "canaan,k210", "riscv";
> >> > +                       device_type = "cpu";
> >> > +                       reg = <1>;
> >> > +                       riscv,isa = "rv64imafdc";
> >> > +                       i-cache-block-size = <64>;
> >> > +                       i-cache-size = <0x8000>;
> >> > +                       d-cache-block-size = <64>;
> >> > +                       d-cache-size = <0x8000>;
> >> > +                       cpu1_intc: interrupt-controller {
> >> > +                               #interrupt-cells = <1>;
> >> > +                               compatible = "riscv,cpu-intc";
> >> > +                               interrupt-controller;
> >> > +                       };
> >> > +               };
> >> > +
> >> > +       };
> >> > +
> >> > +       clocks {
> >> > +                in0: oscillator {
> >> > +                       compatible = "fixed-clock";
> >> > +                       #clock-cells = <0>;
> >> > +                       clock-frequency = <26000000>;
> >> > +               };
> >> > +       };
> >> > +
> >> > +       sram: memory at 80000000 {
> >> > +               device_type = "memory";
> >> > +                compatible = "canaan,k210-sram";
> >> > +               reg = <0x80000000 0x400000>,
> >> > +                     <0x80400000 0x200000>,
> >> > +                     <0x80600000 0x200000>;
> >> > +                reg-names = "sram0",
> >> > +                            "sram1",
> >> > +                            "aisram";
> >> > +
> >> > +       };
> >> > +
> >> > +       soc: soc {
> >> > +               #address-cells = <1>;
> >> > +               #size-cells = <1>;
> >> > +               compatible = "simple-bus";
> >> > +               ranges;
> >> > +                interrupt-parent = <&plic0>;
> >> > +
> >> > +                rom0: nvmem at 1000 {
> >> > +                         reg = <0x1000 0x1000>;
> >> > +                         read-only;
> >> > +                };
> >> > +
> >> > +               clint0: timer at 2000000 {
> >> > +                       compatible = "riscv,clint0","sifive,clint0";
> >> > +                       reg = <0x2000000 0xC000>;
> >> > +                       interrupts-extended = <&cpu0_intc
> 3>,<&cpu0_intc 7>,
> >> > +                                             <&cpu1_intc
> 3>,<&cpu1_intc 7>;
> >> > +               };
> >> > +
> >> > +               plic0: interrupt-controller at c000000 {
> >> > +                       #interrupt-cells = <1>;
> >> > +                       #address-cells = <0>;
> >> > +                       compatible =
> "riscv,plic0","sifive,plic-1.0.0";
> >> > +                       reg = <0xC000000 0x4000000>;
> >> > +                       riscv,ndev = <65>;
> >> > +                       interrupt-controller;
> >> > +                       interrupts-extended =
> >> > +                               <&cpu0_intc 11>, <&cpu0_intc 9>,
> >> > +                               <&cpu1_intc 11>, <&cpu1_intc 9>;
> >> > +               };
> >> > +
> >> > +               uarths0: serial at 38000000 {
> >> > +                       compatible =
> "canaan,k210-uarths","sifive,uart0";
> >> > +                       reg = <0x38000000 0x1000>;
> >> > +                       interrupts = <33>;
> >> > +                       clocks = <&sysclk 0>;
> >> > +
> >> > +               };
> >> > +
> >> > +                /* apb0 has gpio1 and additional uarts */
> >> > +               apb0: bus at 50200000 {
> >> > +                       #address-cells = <1>;
> >> > +                       #size-cells = <1>;
> >> > +                       compatible = "simple-pm-bus";
> >> > +                       ranges;
> >> > +                       clocks = <&sysclk 8>;
> >> > +
> >> > +                       uart1: serial at 50210000 {
> >> > +                               compatible = "snps,dw-apb-uart";
> >> > +                               reg = <0x50210000 0x100>;
> >> > +                               interrupts = <11>;
> >> > +                               clocks = <&sysclk 30>,
> >> > +                                        <&sysclk 8>;
> >> > +                               clock-namees = "baudclk", "abp_pclk";
> >> > +                               resets = <&sysrst 16>;
> >> > +                               reg-io-width = <4>;
> >> > +                               reg-shift = <2>;
> >> > +                               dcd-override;
> >> > +                               dsr-override;
> >> > +                               cts-override;
> >> > +                               ri-override;
> >> > +                       };
> >> > +                };
> >> > +
> >> > +                apb1: bus at 50400000 {
> >> > +                       #address-cells = <1>;
> >> > +                       #size-cells = <1>;
> >> > +                       compatible = "simple-pm-bus";
> >> > +                       ranges;
> >> > +                       clocks = <&sysclk 9>;
> >> > +
> >> > +                       sysctl: syscon at 50440000 {
> >> > +                               compatible =
> "canaan,k210-sysctl","syscon",
> >> > +                                            "simple-mfd";
> >> > +                               reg = <0x50440000 0x100>;
> >> > +                               clocks = <&sysclk 9>;
> >> > +                               clock-names = "pclk";
> >> > +                               sysclk: clock-controller {
> >> > +                                       #clock-cells = <1>;
> >> > +                                       compatible =
> "canaan,k210-rst";
> >> > +                                       clock = <&in0>;
> >> > +                               };
> >> > +                               sysrst: reset-coontroller {
> >> > +                                       compatible =
> "canaan,k210-rst";
> >> > +                                       #reset-cells = <1>;
> >> > +                               };
> >> > +                               reboot: syscon-reboot {
> >> > +                                       compatible = "syscon-reboot";
> >> > +                                       regmap = <&sysctl>;
> >> > +                                       offset = <48>;
> >> > +                                       mask = <1>;
> >> > +                                       value = <1>;
> >> > +                               };
> >> > +                       };
> >> > +               };
> >> > +
> >> > +       };
> >> > +};
> >> > diff --git a/bsps/riscv/riscv/include/bsp.h
> b/bsps/riscv/riscv/include/bsp.h
> >> > index 911b85f4a3..c33de42aa7 100644
> >> > --- a/bsps/riscv/riscv/include/bsp.h
> >> > +++ b/bsps/riscv/riscv/include/bsp.h
> >> > @@ -60,6 +60,10 @@
> >> >
> >> >  #include <rtems/devnull.h>
> >> >
> >> > +#if RISCV_ENABLE_KENDRYTE_K210_SUPPORT != 0
> >> > +   #include <bsp/k210.h>
> >> > +#endif
> >> > +
> >> >  #ifdef __cplusplus
> >> >  extern "C" {
> >> >  #endif
> >> > diff --git a/bsps/riscv/riscv/include/bsp/k210.h
> b/bsps/riscv/riscv/include/bsp/k210.h
> >> > new file mode 100644
> >> > index 0000000000..558502cd11
> >> > --- /dev/null
> >> > +++ b/bsps/riscv/riscv/include/bsp/k210.h
> >> > @@ -0,0 +1,91 @@
> >> > +/* SPDX-License-Identifier: BSD-2-Clause */
> >> > +
> >> > +/**
> >> > + * @file
> >> > + *
> >> > + * @ingroup k210_regs
> >> > + *
> >> > + * @brief k210 RISC-V CPU defines.
> >> > + */
> >> > +
> >> > +/*
> >> > + *
> >> > + *  Copyright (c) 2022 Alan Cudmore
> >> > + *
> >> > + *  The license and distribution terms for this file may be
> >> > + *  found in the file LICENSE in this distribution or at
> >> > + *
> >> > + *  http://www.rtems.org/license/LICENSE
> >>
> >
> > OK  - I'll update this
> >
> >>
> >> Please use the 2-BSD boilerplate consistent with the SPDX above.
> >>
> >> > + *
> >> > + */
> >> > +
> >> > +#ifndef LIBBSP_RISCV_RISCV_K210_H
> >> > +#define LIBBSP_RISCV_RISCV_K210_H
> >> > +
> >> > +#include <bspopts.h>
> >> > +#include <stdint.h>
> >> > +#include <bsp/utility.h>
> >> > +
> >> > +/**
> >> > + * @defgroup K210 RISC V Register Definitions
> >> > + *
> >> > + * @ingroup RTEMSBSPsriscv
> >> > + *
> >> > + * @brief Register Definitions
> >> > + *
> >> > + * @{
> >> > + */
> >> > +
> >> > +#ifdef __cplusplus
> >> > +extern "C" {
> >> > +#endif
> >> > +
> >> > +/* For PLL / Clocks */
> >> > +#define K210_SYSCTL_BASE     0x50440000
> >> > +
> >> > +#define PLL_CLK_R(n)         (n & 0x00000F)
> >> Usually good practice to put parens around CPP macro arguments, e.g.,
> >> ((n) & 0x00000F)
> >>
> >> > +#define PLL_CLK_F(n)         ((n & 0x0003F0) >> 4)
> >> > +#define PLL_CLK_OD(n)        ((n & 0x003C00) >> 10)
> >> > +#define CLKSEL0_ACLK_SEL(n)  (n & 0x00000001)
> >> > +
> >> > +typedef struct {
> >> > +  uint32_t git_id;
> >> > +  uint32_t clk_freq;
> >> > +  uint32_t pll0;
> >> > +  uint32_t pll1;
> >> > +  uint32_t pll2;
> >> > +  uint32_t resv5;
> >> > +  uint32_t pll_lock;
> >> > +  uint32_t rom_error;
> >> > +  uint32_t clk_sel0;
> >> > +  uint32_t clk_sel1;
> >> > +  uint32_t clk_en_cent;
> >> > +  uint32_t clk_en_peri;
> >> > +  uint32_t soft_reset;
> >> > +  uint32_t peri_reset;
> >> > +  uint32_t clk_th0;
> >> > +  uint32_t clk_th1;
> >> > +  uint32_t clk_th2;
> >> > +  uint32_t clk_th3;
> >> > +  uint32_t clk_th4;
> >> > +  uint32_t clk_th5;
> >> > +  uint32_t clk_th6;
> >> > +  uint32_t misc;
> >> > +  uint32_t peri;
> >> > +  uint32_t spi_sleep;
> >> > +  uint32_t reset_status;
> >> > +  uint32_t dma_sel0;
> >> > +  uint32_t dma_sel1;
> >> > +  uint32_t power_sel;
> >> > +  uint32_t resv28;
> >> > +  uint32_t resv29;
> >> > +  uint32_t resv30;
> >> > +  uint32_t resv31;
> >> > +} k210_sysctl_t;
> >> > +
> >> > +#ifdef __cplusplus
> >> > +}
> >> > +#endif
> >> > +
> >> > +/** @} */
> >> > +#endif /* LIBBSP_RISCV_RISCV_K210_H */
> >> > diff --git a/bsps/riscv/riscv/include/bsp/kendryte-k210-dtb.h
> b/bsps/riscv/riscv/include/bsp/kendryte-k210-dtb.h
> >> > new file mode 100644
> >> > index 0000000000..ad13aefdbf
> >> > --- /dev/null
> >> > +++ b/bsps/riscv/riscv/include/bsp/kendryte-k210-dtb.h
> >> > @@ -0,0 +1,315 @@
> >> > +/* SPDX-License-Identifier: BSD-2-Clause */
> >> > +
> >> > +/*
> >> > + *  Declarations for C structure representing binary file system.dtb
> >> > + *
> >> > + *  WARNING: Automatically generated -- do not edit!
> >> > + */
> >> > +
> >> > +/*
> >> > + * Copyright (C) Alan Cudmore
> >> > + *
> >> > + * Redistribution and use in source and binary forms, with or without
> >> > + * modification, are permitted provided that the following conditions
> >> > + * are met:
> >> > + * 1. Redistributions of source code must retain the above copyright
> >> > + *      notice, this list of conditions and the following disclaimer.
> >> > + * 2. Redistributions in binary form must reproduce the above
> copyright
> >> > + *      notice, this list of conditions and the following disclaimer
> in the
> >> > + *      documentation and/or other materials provided with the
> distribution.
> >> > + *
> >> > + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
> CONTRIBUTORS "AS IS"
> >> > + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
> TO, THE
> >> > + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
> PARTICULAR PURPOSE
> >> > + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
> CONTRIBUTORS BE
> >> > + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
> OR
> >> > + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
> OF
> >> > + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
> BUSINESS
> >> > + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
> WHETHER IN
> >> > + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
> OTHERWISE)
> >> > + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
> ADVISED OF THE
> >> > + * POSSIBILITY OF SUCH DAMAGE.
> >> > + */
> >> > +
> >> > +#ifndef __kendryte_k210_dtb_h
> >> > +#define __kendryte_k210_dtb_h
> >> > +
> >> > +#include <rtems/score/basedefs.h>
> >> > +#include <sys/types.h>
> >> > +
> >> > +const unsigned char system_dtb[] RTEMS_ALIGNED(8) = {
> >> > +  0xd0, 0x0d, 0xfe, 0xed, 0x00, 0x00, 0x0c, 0xa7, 0x00, 0x00, 0x00,
> 0x38,
> >> > +  0x00, 0x00, 0x0a, 0xb4, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00,
> 0x11,
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> 0x65,
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> 0x65,
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> >> > +};
> >> > +
> >> > +const size_t system_dtb_size = sizeof(system_dtb);
> >> > +
> >> > +#endif /* __kendryte_k210_dtb_h */
> >> > diff --git a/bsps/riscv/riscv/include/bsp/riscv.h
> b/bsps/riscv/riscv/include/bsp/riscv.h
> >> > index bbaaa246c1..d294f1ae58 100644
> >> > --- a/bsps/riscv/riscv/include/bsp/riscv.h
> >> > +++ b/bsps/riscv/riscv/include/bsp/riscv.h
> >> > @@ -56,6 +56,10 @@ uint32_t riscv_get_hart_index_by_phandle(uint32_t
> phandle);
> >> >  void htif_poweroff(void);
> >> >  #endif
> >> >
> >> > +#if RISCV_ENABLE_KENDRYTE_K210_SUPPORT != 0
> >> > +uint32_t k210_get_frequency(void);
> >> > +#endif
> >> > +
> >> >  #ifdef __cplusplus
> >> >  }
> >> >  #endif
> >> > diff --git a/bsps/riscv/riscv/start/bspstart.c
> b/bsps/riscv/riscv/start/bspstart.c
> >> > index 30d479ce88..a0b6e683f6 100644
> >> > --- a/bsps/riscv/riscv/start/bspstart.c
> >> > +++ b/bsps/riscv/riscv/start/bspstart.c
> >> > @@ -201,6 +201,14 @@ static uint32_t get_core_frequency(void)
> >> >      return fdt32_to_cpu(*val);
> >> >    }
> >> >  #endif
> >> > +
> >> > +#if RISCV_ENABLE_KENDRYTE_K210_SUPPORT != 0
> >> > +  uint32_t cpu_clock;
> >> > +
> >> > +  cpu_clock = k210_get_frequency();
> >> > +  return cpu_clock;
> >> > +#endif
> >> > +
> >> >    return 0;
> >
> >
> > When you choose the kendrtyek210 BSP variant, the
> RISCV_ENABLE_KENDRYTE_K210_SUPPORT is set to true enabling the code that is
> needed for frequency calculation in this file. I tried to follow the same
> pattern for the MPFS and FRDME310ARTY variants here.
> > The K210, FRME310ARTY, and MPFS options could probably use refactoring,
> but I was reluctant to change existing code for the MPFS and 310ARTY since
> I do not have a way of testing them.
> >
> I would at  a minimum make it #else return 0
> to avoid having unreachable code in your build.
>

 The "return 0" is right after my ifdef block. If I put #else return 0,
then there will be two "return 0" statements.
If none of the variant options are defined, then the entire routine
defaults to "return 0" at the bottom.
Should I eliminate that and put the else clauses for the FRDME310ARTY and
MPFS variants too?
Thanks,
Alan



>
> >> This code is unreachable if RISCV_ENABLE_KENDRYTE_K210_SUPPORT != 0.
> >>
> >> >  }
> >> >
> >> > @@ -215,6 +223,40 @@ uint32_t bsp_fdt_map_intr(const uint32_t *intr,
> size_t icells)
> >> >    return RISCV_INTERRUPT_VECTOR_EXTERNAL(intr[0]);
> >> >  }
> >> >
> >> > +#if RISCV_ENABLE_KENDRYTE_K210_SUPPORT != 0
> >> > +uint32_t k210_get_frequency(void)
> >> > +{
> >> > +  k210_sysctl_t *sysctl = (k210_sysctl_t *)K210_SYSCTL_BASE;
> >> > +  uint32_t cpu_clock = 0;
> >> > +  uint32_t clk_freq;
> >> > +  uint32_t pll0, nr, nf, od;
> >> > +  uint32_t node;
> >> > +  const char *fdt;
> >> > +  const fdt32_t *val;
> >> > +  int len;
> >> > +
> >> > +  fdt = bsp_fdt_get();
> >> > +  node = fdt_node_offset_by_compatible(fdt, -1,"fixed-clock");
> >> > +  val = fdt_getprop(fdt, node, "clock-frequency", &len);
> >> > +  if (val != NULL && len == 4) {
> >> > +    clk_freq = fdt32_to_cpu(*val);
> >> > +
> >> > +    if (CLKSEL0_ACLK_SEL(sysctl->clk_sel0) == 1) {
> >> > +       /* PLL0 selected */
> >> > +       pll0 = sysctl->pll0;
> >> > +       nr = PLL_CLK_R(pll0) + 1;
> >> > +       nf = PLL_CLK_F(pll0) + 1;
> >> > +       od = PLL_CLK_OD(pll0) + 1;
> >> > +       cpu_clock = (clk_freq / nr * nf / od)/2;
> >> > +    } else {
> >> > +       /* OSC selected */
> >> > +       cpu_clock = clk_freq;
> >> > +    }
> >> > +  }
> >> > +  return cpu_clock;
> >> > +}
> >> > +#endif
> >> > +
> >> >  void bsp_start(void)
> >> >  {
> >> >    riscv_find_harts();
> >> > --
> >> > 2.25.1
> >> >
> >> > _______________________________________________
> >> > devel mailing list
> >> > devel at rtems.org
> >> > http://lists.rtems.org/mailman/listinfo/devel
>
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