Hi Sean
> The Sipeed Maix series is a collection of boards built around the RISC-V
> Kendryte K210 processor. This processor contains several peripherals to
> accelerate neural network processing and other "ai" tasks. This includes a
> "KPU" neural network processor, an audio processor supporting beamforming
> reception, and a digital video port supporting capture and output at VGA
> resolution. Other peripherals include 8M of sram (accessible with and
> without caching); remappable pins, including 40 GPIOs; AES, FFT, and SHA256
> accelerators; a DMA controller; and I2C, I2S, and SPI controllers. Maix
> peripherals vary, but include spi flash; on-board usb-serial bridges; ports
> for cameras, displays, and sd cards; and ESP32 chips. Currently, only the
> Sipeed Maix Bit V2.0 (bitm) is supported, but the boards are fairly
> similar.
>
> Documentation for Maix boards is located at
> <http://dl.sipeed.com/MAIX/HDK/>. Documentation for the Kendryte K210 is
> located at <https://kendryte.com/downloads/>. However, hardware details are
> rather lacking, so most technical reference has been taken from the
> standalone sdk located at
> <https://github.com/kendryte/kendryte-standalone-sdk>.
>
> Signed-off-by: Sean Anderson <sean...@gmail.com>
> board f
Please remove "board f"
>
> ---
>
> Changes in v7:
> - Split docs off into their own patch
> - Enable ram clocks by name
>
> Changes in v6:
> - Remove trailing whitespace from documentation
> - Remove configuration for spi/pinmux/gpio features
> - Flesh out documentation some more
>
> Changes in v5:
> - Configure relocation location with CONFIG_SYS_SDRAM_*
> - Enable ram clocks
> - Add pinmux/gpio/led support
> - Remove (broken) MMC support
> - Store the environment in flash
> - Add partitions
> - Add bootcmd
> - Add docs for pinctrl and booting
>
> Changes in v4:
> - Rework documentation to be organized by board mfg not cpu mfg
> - Update docs to reflect working SPI support
> - Add proper spi support
> - Don't define unneecessary macros in config.h
> - Lower the default stack so it isn't clobbered on relocation
> - Update MAINTAINERS
> - Update copyright
>
> Changes in v3:
> - Reorder to be last in the patch series
> - Add documentation for the board
> - Generate defconfig with "make savedefconfig"
> - Update Kconfig to imply most features we need
> - Update MAINTAINERS
>
> Changes in v2:
> - Select CONFIG_SYS_RISCV_NOCOUNTER
> - Imply CONFIG_CLK_K210
> - Remove spurious references to CONFIG_ARCH_K210
> - Remove many configs from defconfig where the defaults were fine
> - Add a few "not set" lines to suppress unneeded defaults
> - Reduce pre-reloc malloc space, now that clocks initialization happens
> later
>
> arch/riscv/Kconfig | 4 +++
> board/sipeed/maix/Kconfig | 48 ++++++++++++++++++++++++++
> board/sipeed/maix/MAINTAINERS | 11 ++++++
> board/sipeed/maix/Makefile | 5 +++
> board/sipeed/maix/maix.c | 54 ++++++++++++++++++++++++++++++
> configs/sipeed_maix_bitm_defconfig | 8 +++++
> include/configs/sipeed-maix.h | 24 +++++++++++++
> 7 files changed, 154 insertions(+)
> create mode 100644 board/sipeed/maix/Kconfig
> create mode 100644 board/sipeed/maix/MAINTAINERS
> create mode 100644 board/sipeed/maix/Makefile
> create mode 100644 board/sipeed/maix/maix.c
> create mode 100644 configs/sipeed_maix_bitm_defconfig
> create mode 100644 include/configs/sipeed-maix.h
>
> diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
> index b7a5757584..d016dd75d7 100644
> --- a/arch/riscv/Kconfig
> +++ b/arch/riscv/Kconfig
> @@ -20,6 +20,9 @@ config TARGET_QEMU_VIRT
> config TARGET_SIFIVE_FU540
> bool "Support SiFive FU540 Board"
>
> +config TARGET_SIPEED_MAIX
> + bool "Support Sipeed Maix Board"
> +
> endchoice
>
> config SYS_ICACHE_OFF
> @@ -53,6 +56,7 @@ source "board/AndesTech/ax25-ae350/Kconfig"
> source "board/emulation/qemu-riscv/Kconfig"
> source "board/microchip/mpfs_icicle/Kconfig"
> source "board/sifive/fu540/Kconfig"
> +source "board/sipeed/maix/Kconfig"
>
> # platform-specific options below
> source "arch/riscv/cpu/ax25/Kconfig"
> diff --git a/board/sipeed/maix/Kconfig b/board/sipeed/maix/Kconfig
> new file mode 100644
> index 0000000000..8292089fc9
> --- /dev/null
> +++ b/board/sipeed/maix/Kconfig
> @@ -0,0 +1,48 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +# Copyright (C) 2019-20 Sean Anderson <sean...@gmail.com>
> +
> +if TARGET_SIPEED_MAIX
> +
> +config SYS_BOARD
> + default "maix"
> +
> +config SYS_VENDOR
> + default "sipeed"
> +
> +config SYS_CPU
> + default "generic"
> +
> +config SYS_CONFIG_NAME
> + default "sipeed-maix"
> +
> +config SYS_TEXT_BASE
> + default 0x80000000
> +
> +config DEFAULT_DEVICE_TREE
> + default "k210-maix-bit"
> +
> +config NR_CPUS
> + default 2
> +
> +config NR_DRAM_BANKS
> + default 3
> +
> +config BOARD_SPECIFIC_OPTIONS
> + def_bool y
> + select GENERIC_RISCV
> + select RISCV_PRIV_1_9
> + imply SMP
> + imply OF_BOARD_SETUP
> + imply DM_SERIAL
> + imply SIFIVE_SERIAL
> + imply SIFIVE_CLINT
> + imply POWER_DOMAIN
> + imply SIMPLE_PM_BUS
> + imply CLK_CCF
> + imply CLK_COMPOSITE_CCF
> + imply CLK_K210
> + imply DM_RESET
> + imply RESET_SYSCON
> + imply SYSRESET
> + imply SYSRESET_SYSCON
> +endif
> diff --git a/board/sipeed/maix/MAINTAINERS b/board/sipeed/maix/MAINTAINERS
> new file mode 100644
> index 0000000000..1f33882e1e
> --- /dev/null
> +++ b/board/sipeed/maix/MAINTAINERS
> @@ -0,0 +1,11 @@
> +Sipeed Maix BOARD
> +M: Sean Anderson <sean...@gmail.com>
> +S: Maintained
> +F: arch/riscv/dts/k210.dtsi
> +F: arch/riscv/dts/k210-maix-bit.dts
> +F: board/sipeed/maix/
> +F: configs/sipeed_maix_defconfig
> +F: doc/board/sipeed/
> +F: include/configs/sipeed-maix.h
> +F: include/dt-bindings/*/k210-sysctl.h
> +F: test/dm/k210_pll.c
> diff --git a/board/sipeed/maix/Makefile b/board/sipeed/maix/Makefile
> new file mode 100644
> index 0000000000..4acff5b31e
> --- /dev/null
> +++ b/board/sipeed/maix/Makefile
> @@ -0,0 +1,5 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +#
> +# Copyright (c) 2019 Western Digital Corporation or its affiliates.
> +
> +obj-y += maix.o
> diff --git a/board/sipeed/maix/maix.c b/board/sipeed/maix/maix.c
> new file mode 100644
> index 0000000000..f5ed54c70f
> --- /dev/null
> +++ b/board/sipeed/maix/maix.c
> @@ -0,0 +1,54 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2019-20 Sean Anderson <sean...@gmail.com>
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm.h>
> +#include <fdt_support.h>
> +
> +phys_size_t get_effective_memsize(void)
> +{
> + return CONFIG_SYS_SDRAM_SIZE;
> +}
> +
> +int board_init(void)
> +{
> + int ret, i;
> + const char * const banks[] = { "sram0", "sram1", "airam" };
> + ofnode memory;
> + struct clk clk;
> +
> + /* Enable RAM clocks */
> + memory = ofnode_by_compatible(ofnode_null(), "kendryte,k210-sram");
> + if (ofnode_equal(memory, ofnode_null()))
> + return -ENOENT;
> +
> + for (i = 0; i < ARRAY_SIZE(banks); i++) {
> + ret = clk_get_by_name_nodev(memory, banks[i], &clk);
> + if (ret)
> + continue;
> +
> + ret = clk_enable(&clk);
> + clk_free(&clk);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +int ft_board_setup(void *blob, bd_t *bd)
> +{
> + int i;
> + u64 base[CONFIG_NR_DRAM_BANKS];
> + u64 size[CONFIG_NR_DRAM_BANKS];
> +
> + for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
> + base[i] = bd->bi_dram[i].start;
> + size[i] = bd->bi_dram[i].size;
> + }
> +
> + return fdt_fixup_memory_banks(blob, base, size, CONFIG_NR_DRAM_BANKS);
> +}
> diff --git a/configs/sipeed_maix_bitm_defconfig
> b/configs/sipeed_maix_bitm_defconfig
> new file mode 100644
> index 0000000000..f48f7f06e9
> --- /dev/null
> +++ b/configs/sipeed_maix_bitm_defconfig
> @@ -0,0 +1,8 @@
> +CONFIG_RISCV=y
> +CONFIG_TARGET_SIPEED_MAIX=y
> +CONFIG_ARCH_RV64I=y
> +CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
> +# CONFIG_NET is not set
> +# CONFIG_INPUT is not set
> +# CONFIG_DM_ETH is not set
> +# CONFIG_EFI_LOADER is not set
> diff --git a/include/configs/sipeed-maix.h b/include/configs/sipeed-maix.h
> new file mode 100644
> index 0000000000..a46473fc78
> --- /dev/null
> +++ b/include/configs/sipeed-maix.h
> @@ -0,0 +1,24 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2019-20 Sean Anderson <sean...@gmail.com>
> + */
> +
> +#ifndef CONFIGS_SIPEED_MAIX_H
> +#define CONFIGS_SIPEED_MAIX_H
> +
> +#include <linux/sizes.h>
> +
> +#define CONFIG_SYS_LOAD_ADDR 0x80000000
> +/* Start just below the second bank so we don't clobber it during reloc */
> +#define CONFIG_SYS_INIT_SP_ADDR 0x803FFFFF
> +#define CONFIG_SYS_MALLOC_LEN SZ_128K
> +#define CONFIG_SYS_CACHELINE_SIZE 64
> +
> +#define CONFIG_SYS_SDRAM_BASE 0x80000000
> +/* Don't relocate into AI ram since it isn't set up yet */
> +#define CONFIG_SYS_SDRAM_SIZE (SZ_4M + SZ_2M)
> +
> +/* For early init */
> +#define K210_SYSCTL_BASE 0x50440000
> +
> +#endif /* CONFIGS_SIPEED_MAIX_H */
> --
> 2.25.1
>
