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本文章基于意法半导体STM32MP157芯片的小熊派BearPi-HM Micro开发板，进行小型带屏开发板的移植，实现了ace_engine_lite、graphic_ui、aafwk_lite、appexecfwk_lite、HDF等部件基于OpenHarmony LiteOS-A内核的适配。移植架构上采用Board与SoC分离的方案。
本方案的目录结构使用Board和SoC解耦的设计思路，并把芯片适配目录规划为：
device
├── board --- 单板厂商目录
│ └── bearpi --- 单板厂商名字：小熊派
│ └── bearpi_hm_micro --- 单板名：bearpi_hm_micro
└── soc --- SoC厂商目录
└── common --- 存放公共HDF驱动
└── st --- SoC厂商名字：ST意法半导体
└── stm32mp1xx --- SoC Series名：stm32mp1xx系列芯片
产品样例目录规划为：
vendor
└── bearpi --- 开发产品样例厂商目录，小熊派的产品样例
└── bearpi_hm_micro --- 产品名字：bearpi_hm_micro开发板
在进行移植之前，需要进行预编译适配。
预编译适配主要使用hb set命令，设置整个项目的根目录、单板目录、产品目录、单板公司名等环境变量，为编译做准备。
具体的预编译适配步骤如下：
在vendor/bearpi/bearpi_hm_micro目录下新增config.json文件，用于描述这个产品样例所使用的单板、内核等信息，描述信息可参考如下内容：
{
"product_name": "bearpi_hm_micro", --- 用于hb set进行选择时，显示的产品名称
"version": "3.0", --- 构建系统的版本，1.0/2.0/3.0
"type": "small", --- 构建系统的类型，mini/small/standard
"ohos_version": "OpenHarmony 3.0", --- OpenHarmony系统版本
"device_company": "bearpi", --- 单板厂商名，用于编译时找到/device/board/bearpi目录
"board": "bearpi_hm_micro", --- 单板名，用于编译时找到/device/board/bearpi/bearpi_hm_micro目录
"kernel_type": "liteos_a", --- 内核类型，因为OpenHarmony支持多内核，一块单板可能适配了多个内核，所以需要指定某个内核进行编译
"kernel_version": "", --- 内核版本，一块单板可能适配了多个linux内核版本，所以需要指定某个具体的内核版本进行编译
"subsystems": [ ] --- 选择所需要编译构建的子系统
}
在device/board/bearpi/bearpi_hm_micro/liteos_a目录下新增config.gni文件，用于描述这个产品样例所使用的单板、内核等信息，描述信息可参考如下内容：
# Kernel type, e.g. "linux", "liteos_a", "liteos_m".
kernel_type = "liteos_a"
# Kernel version.
kernel_version = ""
# Board CPU type, e.g. "cortex-a7", "riscv32".
board_cpu = "cortex-a7"
# Board arch, e.g. "armv7-a", "rv32imac".
board_arch = ""
# Toolchain name used for system compiling.
# E.g. gcc-arm-none-eabi, arm-linux-harmonyeabi-gcc, ohos-clang, riscv32-unknown-elf.
# Note: The default toolchain is "ohos-clang". It's not mandatory if you use the default toolchain.
board_toolchain = ""
# The toolchain path installed, it's not mandatory if you have added toolchain path to your ~/.bashrc.
board_toolchain_path = ""
# Compiler prefix.
board_toolchain_prefix = ""
# Compiler type, "gcc" or "clang".
board_toolchain_type = "clang"
# Board related common compile flags.
board_cflags = [
"-mfloat-abi=softfp",
"-mfpu=neon-vfpv4",
]
board_cxx_flags = [
"-mfloat-abi=softfp",
"-mfpu=neon-vfpv4",
]
board_ld_flags = []
# Board related headfiles search path.
board_include_dirs = []
# Board adapter dir for OHOS components.
board_adapter_dir = "//device/board/bearpi/bearpi_hm_micro/hal"
# Sysroot path.
board_configed_sysroot = ""
# Board storage type, it used for file system generation.
storage_type = "emmc"
验证hb set配置是否正确，输入hb set能够显示如下图片表示配置正确。
执行hb set输入项目根目录，并且回车，hb命令会遍历所有//vendor/<product_company>/<product_name>目录下的config.json，给出可选产品编译选项，config.json的product_name用于显示产品名，device_company和board用于关联出//device/board/<device_company>/<board>目录，并且匹配<any_dir_name>/config.gni文件，如果能够匹配多个文件，表示该单板适配了多个内核，那么可以根据config.json的kernel_type和kernel_version来唯一匹配config.gni的kernel_type和kernel_version，即可确定了需要编译适配了哪个内核的单板。
选择好产品后，输入回车就会在根目录下自动生成ohos_config.json文件，这里会将要编译的产品信息列出。通过hb env也可以查看选择出来的预编译环境变量。
内核移植需要完成LiteOS-A Kconfig适配、gn的编译构建和内核启动最小适配。
详细移植步骤参考：LiteOS-A内核移植
source "../../device/soc/st/common/platform/Kconfig"
config PLATFORM
string
default "stm32mp157" if PLATFORM_STM32MP157
config PRODUCT_NAME
string "product name"
default "bearpi_hm_micro" if PRODUCT_BEARPI_HM_MICRO
config DEVICE_COMPANY
string "vendor name"
default "st" if PLATFORM_STM32MP157
config TEE_ENABLE
bool "Enable TEE"
default n
depends on PLATFORM_STM32MP157
help
Enable teeos in platform
config DRIVERS_MMC
depends on DRIVERS
bool "Enable MMC"
default y
depends on DRIVERS && FS_VFS
help
Answer Y to enable LiteOS support MMC driver.
config DRIVERS_EMMC
depends on DRIVERS_MMC && PLATFORM_STM32MP157
bool "Enable MMC0 support eMMC type"
config DRIVERS_HI3881
bool "Enable Hi3881 Host driver"
default n
depends on DRIVERS_HDF_WIFI
help
Answer Y to enable Hi3881 Host driver.
config HW_RANDOM_ENABLE
depends on DRIVERS_RANDOM
bool "Select hw random"
default y
help
Answer Y to select hw random.
...
LOSCFG_PLATFORM="stm32mp157"
LOSCFG_PRODUCT_NAME="bearpi_hm_micro"
LOSCFG_DEVICE_COMPANY="st"
# LOSCFG_PLATFORM_HI3516DV300 is not set
# LOSCFG_PLATFORM_HI3518EV300 is not set
# LOSCFG_PLATFORM_QEMU_ARM_VIRT_CA7 is not set
LOSCFG_PLATFORM_STM32MP157=y
LOSCFG_PRODUCT_BEARPI_HM_MICRO=y
LOSCFG_BOARD_CONFIG_PATH="device/board/bearpi/bearpi_hm_micro/liteos_a/board"
LOSCFG_TEE_ENABLE=y
...
cmd = "if [ -f $product_path/hdf_config/BUILD.gn ]; then echo true; else echo false; fi"
HAVE_PRODUCT_CONFIG =
exec_script("//build/lite/run_shell_cmd.py", [ cmd ], "value")
group("liteos_a") {
deps = [
"board",
"drivers",
]
if (HAVE_PRODUCT_CONFIG) {
deps += [ "$product_path/hdf_config" ]
} else {
deps += [ "hdf_config" ]
}
}
config("public") {
configs = [
"board:public",
"drivers:public",
]
}
import("//kernel/liteos_a/liteos.gni")
module_name = "bsp_config"
kernel_module(module_name) {
sources = []
if (defined(LOSCFG_PLATFORM_ADAPT)) {
sources += [ "os_adapt/os_adapt.c" ]
}
}
config("public") {
include_dirs = [ "." ]
include_dirs += [ "include" ]
include_dirs += [ "$LITEOSTOPDIR/drivers/block/disk/include" ]
include_dirs +=
[ "$LITEOSTOPDIR/../../drivers/adapter/khdf/liteos/osal/include" ]
}
import("//drivers/adapter/khdf/liteos/hdf.gni")
group("drivers") {
public_deps = [ "//device/soc/st/common/platform:drivers" ]
}
config("public") {
configs = [ "//device/soc/st/common/platform:public" ]
}
module_switch = defined(LOSCFG_DRIVERS_HDF) && !defined(LOSCFG_DRIVERS_HDF_TEST)
module_name = "libhdf_config"
hdf_driver(module_name) {
hcs_sources = [ "hdf.hcs" ]
}
group("hdf_config") {
public_deps = [ ":$module_name" ]
deps = [
"hdf_test",
"hdf_test/hcs_macro_test",
]
}
...
void SystemInit(void)
{
#ifdef LOSCFG_DRIVERS_RANDOM
dprintf("dev random init ...\n");
Mp1xxRngInit();
#endif
#ifdef LOSCFG_DRIVERS_MEM
dprintf("mem dev init ...\n");
extern int mem_dev_register(void);
mem_dev_register();
#endif
dprintf("Date:%s.\n", __DATE__);
dprintf("Time:%s.\n", __TIME__);
#ifdef LOSCFG_DRIVERS_HDF
dprintf("DeviceManagerStart start ...\n");
if (DeviceManagerStart()) {
PRINT_ERR("No drivers need load by hdf manager!");
}
dprintf("DeviceManagerStart end ...\n");
#endif
net_init();
#ifdef LOSCFG_PLATFORM_ROOTFS
dprintf("OsMountRootfs start ...\n");
if (LOS_GetCmdLine()) {
dprintf("get cmdline error!\n");
}
if (LOS_ParseBootargs()) {
dprintf("parse bootargs error!\n");
}
if (OsMountRootfs()) {
dprintf("mount rootfs error!\n");
}
dprintf("OsMountRootfs end ...\n");
#endif
dprintf("Before PLATFORM_UART ...\n");
#ifdef LOSCFG_DRIVERS_HDF_PLATFORM_UART
if (virtual_serial_init(TTY_DEVICE) != 0) {
PRINT_ERR("virtual_serial_init failed");
}
if (system_console_init(SERIAL) != 0) {
PRINT_ERR("system_console_init failed\n");
}
#endif
dprintf("After PLATFORM_UART ...\n");
if (OsUserInitProcess()) {
PRINT_ERR("Create user init process failed!\n");
return;
}
dprintf("cat log shell end\n");
return;
}
...
驱动适配相关文件放置在device/soc/st/common/platform中，所有的驱动都是通过HDF机制加载，本章节以GPIO驱动适配为例进行详细说明。
在//device/soc/st/common/platform/gpio/BUILD.gn文件中，描述了stm32mp1xx gpio驱动的编译适配。如下：
module_switch = defined(LOSCFG_DRIVERS_HDF_PLATFORM_GPIO) --- 如果打开HDF的GPIO配置开关，才进行如下编译。
module_name = get_path_info(rebase_path("."), "name")
hdf_driver("hdf_gpio") {
sources = [ "stm32mp1_gpio.c" ] ---gpio驱动源文件。
include_dirs = [ ---依赖的.h路径。
"." ,
"../stm32mp1xx_hal/STM32MP1xx_HAL_Driver/Inc",
]
}
在//device/soc/st/common/platform/gpio/stm32mp1_gpio.c文件中，描述了stm32mp1xx gpio驱动的源码适配。
首先，按照OpenHarmony的HDF驱动框架加载驱动基本适配框架，如下：
struct HdfDriverEntry g_GpioDriverEntry = {
.moduleVersion = 1,
.moduleName = "HDF_PLATFORM_GPIO",
.Bind = GpioDriverBind,
.Init = GpioDriverInit,
.Release = GpioDriverRelease,
};
HDF_INIT(g_GpioDriverEntry); --- 通过HDF_INIT 加载GPIO驱动。
在//device/soc/st/stm32mp1xx/sdk_liteos/hdf_config/gpio中添加gpio硬件描述信息文件gpio_config.hcs,在该文件中添加驱动私有配置信息。
root {
platform {
gpio_config {
controller_0x50002000 {
match_attr = "st_stm32mp1_gpio";
groupNum = 11;
bitNum = 16;
gpioRegBase = 0x50002000;
gpioRegStep = 0x1000;
irqRegBase = 0x5000D000;
irqRegStep = 0x400;
}
}
}
}
配置产品加载驱动，产品的所有设备信息被定义在源码文件//vendor/bearpi/bearpi_hm_micro/hdf_config/device_info/device_info.hcs中。
平台驱动请添加到platform的host中。
说明： moduleName要与驱动文件中定义的相同，deviceMatchAttr要与驱动私有配置信息文件gpio_config.hcs中定义match_attr的相同。
root {
...
platform :: host {
device_gpio :: device {
device0 :: deviceNode {
policy = 2;
priority = 10;
permission = 0644;
moduleName = "HDF_PLATFORM_GPIO_MANAGER";
serviceName = "HDF_PLATFORM_GPIO_MANAGER";
}
device1 :: deviceNode {
policy = 0;
priority = 10;
permission = 0644;
moduleName = "HDF_PLATFORM_GPIO";
serviceName = "HDF_PLATFORM_GPIO";
deviceMatchAttr = "st_stm32mp1_gpio";
}
}
}
}
完善驱动代码，gpio_config.hcs的配置信息会在GpioDriverInit中加载。
static int32_t GpioDriverInit(struct HdfDeviceObject *device)
{
int32_t ret;
struct Mp1xxGpioCntlr *stm32gpio = &g_Mp1xxGpioCntlr;
dprintf("%s: Enter", __func__);
if (device == NULL || device->property == NULL) {
HDF_LOGE("%s: device or property NULL!", __func__);
return HDF_ERR_INVALID_OBJECT;
}
//获取属性数据
ret = Mp1xxGpioReadDrs(stm32gpio, device->property);
if (ret != HDF_SUCCESS) {
HDF_LOGE("%s: get gpio device resource fail:%d", __func__, ret);
return ret;
}
...
}
OpenHarmony子系统适配只需要在config.json中增加对应子系统和部件，这样编译系统会将该部件纳入编译目标中。
启动恢复子系统需要适配bootstrap_lite、syspara_lite、appspawn_lite、init_lite四个部件。请在vendor/bearpi/bearpi_hm_micro/config.json中新增对应的配置选项。
{
"subsystem": "startup",
"components": [
{ "component": "syspara_lite", "features":[] },
{ "component": "bootstrap_lite", "features":[] },
{ "component": "appspawn_lite", "features":[] },
{ "component": "init_lite", "features":[] }
]
},
系统启动时会根据//vendor/bearpi/bearpi_hm_micro/init_configs中的启动配置来启动系统。
进行DFX子系统适配需要添加hilog_featured_lite、hidumper_lite部件，直接在config.json文件配置即可。
{
"subsystem": "hiviewdfx",
"components": [
{ "component": "hilog_featured_lite", "features":[] },
{ "component": "hidumper_lite", "features":[] }
]
},
进行系统服务管理子系统适配需要添加samgr_lite、safwk_lite、dmsfwk_lite三个部件，直接在config.json配置即可。
{
"subsystem": "distributed_schedule",
"components": [
{ "component": "samgr_lite", "features":[] },
{ "component": "safwk_lite", "features":[] },
{ "component": "dmsfwk_lite", "features":[] }
]
},
进行安全子系统适配需要添加permission_lite、appverify、device_auth、huks四个部件，直接在config.json配置即可。
{
"subsystem": "security",
"components": [
{ "component": "permission_lite", "features":[] },
{ "component": "appverify", "features":[] },
{ "component": "device_auth", "features":[] },
{ "component": "huks", "features":
[
"huks_config_file = \"hks_config_small.h\""
]
}
]
},
进行公共基础库子系统适配需要添加kv_store、os_dump两个部件，直接在config.json配置即可。
{
"subsystem": "utils",
"components": [
{ "component": "kv_store", "features":[] },
{ "component": "os_dump", "features":[] }
]
},
进行图形子系统适配需要添加graphic_utils部件，直接在config.json配置即可。
{
"subsystem": "graphic",
"components": [
{ "component": "graphic_utils",
"features": [ "enable_ohos_graphic_utils_product_config = true"
]
},
{ "component": "graphic_hals", "features":[] },
{ "component": "ui", "features":[ "enable_graphic_font = true","enable_video_component=false"] },
{ "component": "surface", "features":[] },
{ "component": "wms", "features":[] }
]
},
graphic配置文件见 //vendor/bearpi/bearpi_hm_micro/graphic_config/product_graphic_lite_config.h。
进行ACE开发框架子系统适配需要添加ace_engine_lite部件，直接在config.json配置即可。
{
"subsystem": "ace",
"components": [
{
"component": "ace_engine_lite",
"features": [
"enable_ohos_ace_engine_lite_product_config = true"
]
}
]
},
ace_engine_lite部件配置文件见 //vendor/bearpi/bearpi_hm_micro/ace_lite_config/product_acelite_config.h。
进行元能力子系统适配需要添加aafwk_lite部件，直接在config.json配置即可。
{
"subsystem": "aafwk",
"components": [
{
"component": "aafwk_lite",
"features": [
"enable_ohos_appexecfwk_feature_ability = true" --- 支持FA特性，即包含图形能力。
]
}
]
},
进行包管理子系统适配需要添加appexecfwk_lite部件，直接在config.json配置即可。
{
"subsystem": "appexecfwk",
"components": [
{
"component": "appexecfwk_lite"
}
]
},
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