Linux内核增加HDF驱动子系统

静思語 發表於 2024-2-29 00:00:00

<img title="Linux内核增加HDF驱动子系统" alt="Linux内核增加HDF驱动子系统" border="0" src="https://zhuji.jb51.net/uploads/img/202305/3f69795692b92fa263d9c11c245bc745.jpg">
<h3>
前言</h3>

HDF驱动子系统是OpenHarmony重要的特色功能之一，其主要的功能是实现驱动程序在多内核多平台的物联网环境，实现一次驱动开发，多端部署。之前移植OHOS3.0使用了传统的linux驱动，比较遗憾，今天尝试将HDF驱动子系统加入编译框架。开始前先了解几个名词。

HCS(HDF Configuration Source)是 HDF 驱动框架的配置描述源码，JSON存储。

HC-GEN(HDF Configuration Generator)是 HCS 配置转换工具，可以将 HDF 配置文件HCS转换为二进制HCB。

HCB(HDF Configuration Binary)二进制文件，驱动可使用 HDF 框架提供的配置解析接口获取配置。
<h3>
内核打补丁</h3>

如何在内核加入HDF驱动，linux内核下主要实现是下面两个目录：

drivers\adapter\khdf\linux 和 drivers\framework

这两个目录是通过链接的方式加入到内核编译的，流程如下：

kernel\linux\build\kernel.mk：75
<ol class="dp-sql">
<li class="alt">
$(hide) cd $(KERNEL_SRC_TMP_PATH) && patch -p1 < $(HDF_PATCH_FILE) && patch -p1 < $(DEVICE_PATCH_FILE) 
</li>
</ol>

可以参考3516的HDF补丁：kernel\linux\patches\linux-5.10\hi3516dv300_patch\hdf.patch
<ol class="dp-sql">
<li class="alt">
patching file drivers/Kconfig 
</li>
<li>
patching file drivers/Makefile 
</li>
<li class="alt">
patching file drivers/hdf/Makefile 
</li>
<li>
patching symbolic link drivers/hdf/framework 
</li>
<li class="alt">
patching symbolic link drivers/hdf/khdf 
</li>
<li>
patching symbolic link include/hdf 
</li>
<li class="alt">
</li>
<li>
# 添加到linux内核的补丁 
</li>
<li class="alt">
drivers/hdf/framework -> /drivers/framework/ # 驱动子系统驱动框架、配置管理、配置解析、驱动通用框架模型、硬件通用平台能力接口等 
</li>
<li>
drivers/hdf/khdf -> /drivers/adapter/khdf/linux/ # 在linux内核中部署OpenHarmony驱动框架 
</li>
<li class="alt">
drivers/hdf/Makefile # 由hdf.patch提供 
</li>
<li>
include/hdf -> /drivers/framework/include/ # 驱动框架对外提供能力的头文件 
</li>
</ol>
<h3>
内核配置</h3>

只是打上补丁还不行，还得在内核的编译配置文件中加入HDF选项。最开始的做法就是参考3516的配置选择，但是发现有些配置会导致编译失败。测试发现下面的配置是可以编译成功的。
<ol class="dp-sql">
<li class="alt">
[*] Enable HDF manager 
</li>
<li>
(2) Set HDF support platform 
</li>
<li class="alt">
[*] Enable HDF platform driver 
</li>
<li>
[*] Enable HDF platform mipi dsi driver 
</li>
<li class="alt">
[*] Enable HDF platform gpio driver 
</li>
<li>
[*] Enable HDF platform i2c driver 
</li>
<li class="alt">
[*] Enable HDF platform watchdog driver 
</li>
<li>
[*] hi35xx pwm driver 
</li>
<li class="alt">
[*] Enable HDF platform pwm driver 
</li>
<li>
[*] Enable HDF platform uart driver 
</li>
<li class="alt">
[ ] Enable HDF platform sdio driver 
</li>
<li>
[ ] Enable HDF platform emmc driver 
</li>
<li class="alt">
[*] Enable HDF platform mmc driver 
</li>
<li>
[*] Enable HDF platform spi driver 
</li>
<li class="alt">
[*] Enable HDF platform rtc driver 
</li>
<li>
[*] Enable HDF linux test 
</li>
<li class="alt">
[*] Enable HDF Display driver 
</li>
<li>
[ ] Enable HDF Lcdkit driver 
</li>
<li class="alt">
[*] Enable HDF Icn9700 driver 
</li>
<li>
[ ] Enable HDF St7789 driver 
</li>
<li class="alt">
[*] Enable HDF input driver 
</li>
<li>
[*] Enable HDF tp 5P5 GT911 driver 
</li>
<li class="alt">
[*] Enable HDF tp 2P35 FT6236 driver 
</li>
<li>
[ ] Enable HDF wifi 
</li>
<li class="alt">
[ ] Enable HDF Bluetooth 
</li>
<li>
[*] Enable HDF sensor driver 
</li>
<li class="alt">
[ ] Enable HDF accel sensor driver 
</li>
<li>
[ ] Enable HDF gyro sensor driver 
</li>
<li class="alt">
[ ] Enable HDF barometer sensor driver 
</li>
<li>
[ ] Enable HDF hall sensor driver 
</li>
<li class="alt">
[*] Enable HDF storage driver 
</li>
<li>
[ ] Enable HDF USB PNP Notify driver 
</li>
<li class="alt">
[ ] Enable F_GENERIC driver 
</li>
<li>
[ ] Enable HDF Audio driver 
</li>
<li class="alt">
[*] Enable HDF vibrator driver 
</li>
<li>
[*] Enable HDF linear vibrator driver 
</li>
<li class="alt">
[ ] Enable HDF dsoftbus driver 
</li>
<li>
</li>
<li class="alt">
CONFIG_DRIVERS_HDF=y 
</li>
<li>
CONFIG_HDF_SUPPORT_LEVEL=2 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_PLATFORM=y 
</li>
<li>
CONFIG_DRIVERS_HDF_PLATFORM_MIPI_DSI=y 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_PLATFORM_GPIO=y 
</li>
<li>
CONFIG_DRIVERS_HDF_PLATFORM_I2C=y 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_PLATFORM_WATCHDOG=y 
</li>
<li>
CONFIG_PWM_HI35XX=y 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_PLATFORM_PWM=y 
</li>
<li>
CONFIG_DRIVERS_HDF_PLATFORM_UART=y 
</li>
<li class="alt">
# CONFIG_DRIVERS_HDF_PLATFORM_SDIO is not set 
</li>
<li>
# CONFIG_DRIVERS_HDF_PLATFORM_EMMC is not set 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_PLATFORM_MMC=y 
</li>
<li>
CONFIG_DRIVERS_HDF_PLATFORM_SPI=y 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_PLATFORM_RTC=y 
</li>
<li>
CONFIG_DRIVERS_HDF_TEST=y 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_DISP=y 
</li>
<li>
# CONFIG_DRIVERS_HDF_LCDKIT is not set 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_LCD_ICN9700=y 
</li>
<li>
# CONFIG_DRIVERS_HDF_LCD_ST7789 is not set 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_INPUT=y 
</li>
<li>
CONFIG_DRIVERS_HDF_TP_5P5_GT911=y 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_TP_2P35_FT6236=y 
</li>
<li>
# CONFIG_DRIVERS_HDF_WIFI is not set 
</li>
<li class="alt">
# CONFIG_DRIVERS_HDF_BT is not set 
</li>
<li>
CONFIG_DRIVERS_HDF_SENSOR=y 
</li>
<li class="alt">
# CONFIG_DRIVERS_HDF_SENSOR_ACCEL is not set 
</li>
<li>
# CONFIG_DRIVERS_HDF_SENSOR_GYRO is not set 
</li>
<li class="alt">
# CONFIG_DRIVERS_HDF_SENSOR_BAROMETER is not set 
</li>
<li>
# CONFIG_DRIVERS_HDF_SENSOR_HALL is not set 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_STORAGE=y 
</li>
<li>
# CONFIG_DRIVERS_HDF_USB_PNP_NOTIFY is not set 
</li>
<li class="alt">
# CONFIG_DRIVERS_HDF_USB_F_GENERIC is not set 
</li>
<li>
# CONFIG_DRIVERS_HDF_AUDIO is not set 
</li>
<li class="alt">
CONFIG_DRIVERS_HDF_VIBRATOR=y 
</li>
<li>
CONFIG_DRIVERS_HDF_VIBRATOR_LINEAR=y 
</li>
<li class="alt">
# CONFIG_DRIVERS_HDF_DSOFTBUS is not set 
</li>
<li>
# end of Device Drivers 
</li>
</ol>

[*] Enable HDF linux test 是需要设置的，如果没有设置CONFIG_DRIVERS_HDF_TEST，目录结构就出问题了，会报这样的错误。
<ol class="dp-sql">
<li class="alt">
drivers/hdf/khdf/Makefile:22: PRODUCT_PATH=vendor/raspberrypi/RPI4B 
</li>
<li>
scripts/Makefile.build:44: drivers/hdf/khdf/../../../../vendor/raspberrypi/RPI4B/hdf_config/Makefile: No such file or directory 
</li>
<li class="alt">
make: *** No rule to make target 'drivers/hdf/khdf/../../../../vendor/raspberrypi/RPI4B/hdf_config/Makefile'. Stop. 
</li>
<li>
CC drivers/net/wireless/mac80211_hwsim.o 
</li>
<li class="alt">
make: *** Error 2 
</li>
<li>
make: *** Error 2 
</li>
<li class="alt">
make: *** Error 2 
</li>
<li>
make: *** Waiting for unfinished jobs.... 
</li>
</ol>

下面3个选项要关闭，不然会报下面的错误。

[ ] Enable HDF platform sdio driver

[ ] Enable HDF platform emmc driver

[ ] Enable HDF wifi
<ol class="dp-sql">
<li class="alt">
drivers/../../../../../../drivers/adapter/khdf/linux/platform/sdio/sdio_adapter.o: In function `Hi35xxLinuxSdioRescan': 
</li>
<li>
sdio_adapter.c:(.text+0x20): undefined reference to `hisi_sdio_rescan' 
</li>
<li class="alt">
sdio_adapter.c:(.text+0x34): undefined reference to `himci_get_mmc_host' 
</li>
<li>
drivers/../../../../../../drivers/adapter/khdf/linux/platform/sdio/sdio_adapter.o: In function `Hi35xxLinuxSdioFindFunc': 
</li>
<li class="alt">
sdio_adapter.c:(.text+0xc84): undefined reference to `himci_get_mmc_host' 
</li>
<li>
sdio_adapter.c:(.text+0xc9c): undefined reference to `himci_get_mmc_host' 
</li>
<li class="alt">
sdio_adapter.c:(.text+0xcb4): undefined reference to `himci_get_mmc_host' 
</li>
<li>
drivers/../../../../../../drivers/adapter/khdf/linux/platform/emmc/emmc_adapter.o: In function `Hi35xxLinuxEmmcBind': 
</li>
<li class="alt">
emmc_adapter.c:(.text+0x214): undefined reference to `himci_get_mmc_host' 
</li>
<li>
drivers/../../../../../../device/hisilicon/drivers/wifi/driver/hi3881/oal/oal_sdio_host.o: In function `sdio_card_detect_change': 
</li>
<li class="alt">
oal_sdio_host.c:(.text+0x2ce8): undefined reference to `hisi_sdio_rescan' 
</li>
<li>
make: *** Error 1 
</li>
<li class="alt">
make: Leaving directory '/home/liangzili/ohos/out/KERNEL_OBJ/kernel/src_tmp/linux-5.10' 
</li>
<li>
make: *** Error 2 
</li>
<li class="alt">
ninja: build stopped: subcommand failed. 
</li>
</ol>
<h3>
编译过程</h3>

为了方便测试可以单独进行内核编译，比如我的编译命令是这样的。
<ol class="dp-sql">
<li class="alt">
./build.sh --product-name RPI4B --ccache --build-target raspberrypi_products 
</li>
</ol>

可以分析下HDF这部分的编译过程。

linux-5.10\drivers\hdf\Makefile，hdf.patch会添加这个Makefile，将khdf文件夹加入编译。
<ol class="dp-sql">
<li class="alt">
obj-$(CONFIG_DRIVERS_HDF) += khdf/ 
</li>
</ol>

linux-5.10\drivers\hdf\khdf\Makefile
<ol class="dp-sql">
<li class="alt">
export HDF_ROOT := drivers/hdf 
</li>
<li>
obj-$(CONFIG_DRIVERS_HDF) += osal/ 
</li>
<li class="alt">
obj-$(CONFIG_DRIVERS_HDF) += network/ 
</li>
<li>
obj-$(CONFIG_DRIVERS_HDF) += config/ 
</li>
<li class="alt">
</li>
<li>
SUPPORT_LEVEL_STD_H := $(shell [ "$(CONFIG_HDF_SUPPORT_LEVEL)" -ge 2 ] && echo true) 
</li>
<li class="alt">
</li>
<li>
$(warning PRODUCT_PATH=$(PRODUCT_PATH)) # 会检查PRODUCT_PATH变量 
</li>
<li class="alt">
ifeq ($(PRODUCT_PATH),) 
</li>
<li>
$(error PRODUCT_PATH not) 
</li>
<li class="alt">
endif 
</li>
<li>
</li>
<li class="alt">
# 这里有条注释指明了*.hcs配置文件的存放路径 
</li>
<li>
# for L2+, hcs config should in vendor/product_company/product_name/config/khdf 
</li>
<li class="alt">
ifeq ($(SUPPORT_LEVEL_STD_H), true) 
</li>
<li>
SUB_DIR:=khdf/ 
</li>
<li class="alt">
endif 
</li>
<li>
</li>
<li class="alt">
# HDF test的配置会使hcs目录结构不一样，我当时没有设置CONFIG_DRIVERS_HDF_TEST就掉这个坑里了。 
</li>
<li>
ifeq ($(CONFIG_DRIVERS_HDF), y) 
</li>
<li class="alt">
ifeq ($(CONFIG_DRIVERS_HDF_TEST), y) 
</li>
<li>
obj-$(CONFIG_DRIVERS_HDF) += ../../../../$(PRODUCT_PATH)/hdf_config/$(SUB_DIR)/hdf_test/ 
</li>
<li class="alt">
obj-$(CONFIG_DRIVERS_HDF) += test/ 
</li>
<li>
else 
</li>
<li class="alt">
obj-$(CONFIG_DRIVERS_HDF) += ../../../../$(PRODUCT_PATH)/hdf_config/$(SUB_DIR) 
</li>
<li>
endif 
</li>
<li class="alt">
endif 
</li>
<li>
# ... 后面按照配置添加一些编译目录 ... 
</li>
</ol>

drivers\adapter\khdf\linux\Makefile：会调用 obj-(CONFIG_DRIVERS_HDF) += ../../../../(CONFIGDRIVERSHDF)+=../../../../(PRODUCT_PATH)/hdf_config/$(SUB_DIR)/hdf_test/ 这是OHOS3.0默认的HCS文件存放路径。官方的注释也说明了，所以将设备对应的*.hcs存放到 vendor\raspberrypi\RPI4B\hdf_config\khdf 文件夹，参考 3516 的 vendor\hisilicon\Hi3516DV300\hdf_config\khdf\hdf.hcs 就可了。
<ol class="dp-sql">
<li class="alt">
#include "device_info/device_info.hcs" 
</li>
<li>
#include "platform/i2c_config.hcs" 
</li>
<li class="alt">
#include "platform/hi35xx_watchdog_config.hcs" 
</li>
<li>
#include "platform/hi35xx_pwm_config.hcs" 
</li>
<li class="alt">
#include "platform/hi35xx_uart_config.hcs" 
</li>
<li>
#include "platform/sdio_config.hcs" 
</li>
<li class="alt">
#include "platform/emmc_config.hcs" 
</li>
<li>
#include "platform/hi35xx_spi_config.hcs" 
</li>
<li class="alt">
#include "input/input_config.hcs" 
</li>
<li>
#include "wifi/wlan_platform.hcs" 
</li>
<li class="alt">
#include "wifi/wlan_chip_hi3881.hcs" 
</li>
<li>
#include "sensor/sensor_config.hcs" 
</li>
<li class="alt">
#include "audio/audio_config.hcs" 
</li>
<li>
#include "audio/codec_config.hcs" 
</li>
<li class="alt">
#include "audio/dai_config.hcs" 
</li>
<li>
#include "audio/dma_config.hcs" 
</li>
<li class="alt">
#include "audio/dsp_config.hcs" 
</li>
<li>
#include "vibrator/vibrator_config.hcs" 
</li>
<li class="alt">
#include "vibrator/linear_vibrator_config.hcs" 
</li>
<li>
#include "lcd/lcd_config.hcs" 
</li>
<li class="alt">
</li>
<li>
root { 
</li>
<li class="alt">
module = "hisilicon,hi35xx_chip"; 
</li>
<li>
} 
</li>
</ol>

参考 3516 的 vendor\hisilicon\Hi3516DV300\hdf_config\khdf\Makefile

其中：PRODUCT_PATH环境变量的来源：kernel/linux/build/kernel_module_build.sh:42:export PRODUCT_PATH=$4
<ol class="dp-sql">
<li class="alt">
ifeq ($(LOCAL_HCS_ROOT),) 
</li>
<li>
LOCAL_HCS_ROOT := $(PRODUCT_PATH) 
</li>
<li class="alt">
endif 
</li>
<li>
</li>
<li class="alt">
SOURCE_ROOT:=$(abspath ../../../../../) 
</li>
<li>
</li>
<li class="alt">
HC_GEN_DIR := $(abspath $(SOURCE_ROOT)/drivers/framework/tools/hc-gen) 
</li>
<li>
HC_GEN := $(HC_GEN_DIR)/build/hc-gen 
</li>
<li class="alt">
LOCAL_HCS_ROOT := $(abspath $(dir $(realpath $(lastword $(MAKEFILE_LIST))))) 
</li>
<li>
</li>
<li class="alt">
HCS_DIR := $(LOCAL_HCS_ROOT) 
</li>
<li>
</li>
<li class="alt">
ifneq ($(TARGET_BOARD_PLATFORM),) 
</li>
<li>
HCS_DIR := $(LOCAL_HCS_ROOT)/$(TARGET_BOARD_PLATFORM) 
</li>
<li class="alt">
else 
</li>
<li>
ifneq ($(CONFIG_ARCH_HI3516DV300),) 
</li>
<li class="alt">
HCS_DIR := $(LOCAL_HCS_ROOT) 
</li>
<li>
endif 
</li>
<li class="alt">
ifneq ($(CONFIG_ARCH_HI3518EV300),) 
</li>
<li>
HCS_DIR := $(LOCAL_HCS_ROOT) 
</li>
<li class="alt">
endif 
</li>
<li>
endif 
</li>
<li class="alt">
$(info HCS_DIR = $(HCS_DIR)) 
</li>
<li>
HCB_FLAGS := -b -i -a 
</li>
<li class="alt">
</li>
<li>
HCS_OBJ := hdf_hcs_hex.o 
</li>
<li class="alt">
HCS_OBJ_SRC := $(subst .o,.c,$(notdir $(HCS_OBJ))) 
</li>
<li>
</li>
<li class="alt">
CONFIG_GEN_HEX_SRC := $(addprefix $(LOCAL_HCS_ROOT)/, $(HCS_OBJ_SRC)) 
</li>
<li>
CONFIG_HCS_SRC := $(subst _hcs_hex.o,.hcs,$(addprefix $(HCS_DIR)/, $(HCS_OBJ))) 
</li>
<li class="alt">
</li>
<li>
$(obj)/$(HCS_OBJ): $(CONFIG_GEN_HEX_SRC) 
</li>
<li class="alt">
$(Q)$(CC) $(c_flags) -c -o $@ $< 
</li>
<li>
$(Q)rm -f $< 
</li>
<li class="alt">
</li>
<li>
$(CONFIG_GEN_HEX_SRC): $(LOCAL_HCS_ROOT)/%_hcs_hex.c: $(HCS_DIR)/%.hcs | $(HC_GEN) 
</li>
<li class="alt">
$(Q)echo gen hdf built-in config 
</li>
<li>
$(Q)if [ ! -d $(dir $@) ]; then mkdir -p $(dir $@); fi 
</li>
<li class="alt">
$(Q)$(HC_GEN) $(HCB_FLAGS) -o $(subst _hex.c,,$(@)) $< 
</li>
<li>
</li>
<li class="alt">
$(CONFIG_GEN_SRCS): $(CONFIG_OUT_DIR)%.c: $(HCS_DIR)/%.hcs | $(HC_GEN) 
</li>
<li>
$(Q)echo gen hdf driver config 
</li>
<li class="alt">
$(Q)if [ ! -d $(dir $@) ]; then mkdir -p $(dir $@); fi 
</li>
<li>
$(Q)$(HC_GEN) -t -o $@ $< 
</li>
<li class="alt">
</li>
<li>
$(HC_GEN): 
</li>
<li class="alt">
$(HIDE)make -C $(HC_GEN_DIR) 
</li>
<li>
</li>
<li class="alt">
obj-$(CONFIG_DRIVERS_HDF) += $(HCS_OBJ) 
</li>
</ol>
<h3>
查看结果</h3>

编译完成后，可以上传内核镜像到开发板，来查看HDF驱动框架是否启动成功。

加入HDF前：
<ol class="dp-sql">
<li class="alt">
# ls dev/ 
</li>
<li>
__parameters__ hwrng tty1 tty28 tty46 tty7 
</li>
<li class="alt">
__trigger__ input tty10 tty29 tty47 tty8 
</li>
<li>
autofs kmsg tty11 tty3 tty48 tty9 
</li>
<li class="alt">
binder linux,cma tty12 tty30 tty49 ttyAMA0 
</li>
<li>
block loop-control tty13 tty31 tty5 ttyS0 
</li>
<li class="alt">
bus mem tty14 tty32 tty50 ttyprintk 
</li>
<li>
cachefiles memcg tty15 tty33 tty51 unix 
</li>
<li class="alt">
char null tty16 tty34 tty52 urandom 
</li>
<li>
console port tty17 tty35 tty53 vchiq 
</li>
<li class="alt">
cpuctl ptmx tty18 tty36 tty54 vcs 
</li>
<li>
cpuset pts tty19 tty37 tty55 vcs1 
</li>
<li class="alt">
dri random tty2 tty38 tty56 vcsa 
</li>
<li>
fd rawctl tty20 tty39 tty57 vcsa1 
</li>
<li class="alt">
freezer snd tty21 tty4 tty58 vcsu 
</li>
<li>
fscklogs stderr tty22 tty40 tty59 vcsu1 
</li>
<li class="alt">
full stdin tty23 tty41 tty6 vga_arbiter 
</li>
<li>
gpiochip0 stdout tty24 tty42 tty60 vndbinder 
</li>
<li class="alt">
gpiochip1 system tty25 tty43 tty61 watchdog 
</li>
<li>
graphics tty tty26 tty44 tty62 watchdog0 
</li>
<li class="alt">
hwbinder tty0 tty27 tty45 tty63 zero 
</li>
</ol>

加入HDF后：
<ol class="dp-sql">
<li class="alt">
# ls dev/ 
</li>
<li>
HDF_PLATFORM_I2C_MANAGER loop-control tty24 tty54 
</li>
<li class="alt">
HDF_PLATFORM_UART_1 mem tty25 tty55 
</li>
<li>
HDF_TEST memcg tty26 tty56 
</li>
<li class="alt">
I2C_TEST null tty27 tty57 
</li>
<li>
__parameters__ port tty28 tty58 
</li>
<li class="alt">
__trigger__ ptmx tty29 tty59 
</li>
<li>
autofs pts tty3 tty6 
</li>
<li class="alt">
binder random tty30 tty60 
</li>
<li>
block rawctl tty31 tty61 
</li>
<li class="alt">
bus sample_service tty32 tty62 
</li>
<li>
cachefiles snd tty33 tty63 
</li>
<li class="alt">
char stderr tty34 tty7 
</li>
<li>
console stdin tty35 tty8 
</li>
<li class="alt">
cpuctl stdout tty36 tty9 
</li>
<li>
cpuset system tty37 ttyAMA0 
</li>
<li class="alt">
dev_mgr tty tty38 ttyS0 
</li>
<li>
dri tty0 tty39 ttyprintk 
</li>
<li class="alt">
fd tty1 tty4 unix 
</li>
<li>
freezer tty10 tty40 urandom 
</li>
<li class="alt">
fscklogs tty11 tty41 vchiq 
</li>
<li>
full tty12 tty42 vcs 
</li>
<li class="alt">
gpiochip0 tty13 tty43 vcs1 
</li>
<li>
gpiochip1 tty14 tty44 vcsa 
</li>
<li class="alt">
graphics tty15 tty45 vcsa1 
</li>
<li>
hdf_bl tty16 tty46 vcsu 
</li>
<li class="alt">
hdf_input_host tty17 tty47 vcsu1 
</li>
<li>
hdf_misc_vibrator tty18 tty48 vga_arbiter 
</li>
<li class="alt">
hdf_sensor_manager_ap tty19 tty49 vndbinder 
</li>
<li>
hwbinder tty2 tty5 watchdog 
</li>
<li class="alt">
hwrng tty20 tty50 watchdog0 
</li>
<li>
input tty21 tty51 zero 
</li>
<li class="alt">
kmsg tty22 tty52 
</li>
<li>
linux,cma tty23 tty53 
</li>
</ol>

基本算是启动成功了，接下来考虑打算用HDF的方式添加一下设备。来验证HDF驱动框架是否运转正常。

原文链接：https://harmonyos.51cto.com

頁: [1]

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Linux内核增加HDF驱动子系统