BSP源码下载与编译¶
BSP内核剥离¶
BSP内核对摄像头驱动支持较好，所以在摄像头应用中有必要使用BSP内核。
官方SDK中camdriod与lichee linux内核绑定，而camdriod比较庞大，所以我们只需抽取lichee linux内核，而抛弃camdriod代码。
单独使用lichee linux的方法是：（构建走读见后一节）
解压 buildroot/dl/gcc-linarno.tar.gz 到 lichee/out/sun8iw8p1/linux/common/buildroot/external-toolchain，并加入环境变量（这步其实在下一步里包含了）
执行 build_tiger-cdr.sh
执行过程中会生成内核文件：
Image Name: Linux-3.4.39
Created: Tue Sep 5 06:55:03 2017
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2275400 Bytes = 2222.07 kB = 2.17 MB
Load Address: 40008000
Entry Point: 40008000
Image arch/arm/boot/uImage is ready
'arch/arm/boot/Image' -> 'output/bImage'
'arch/arm/boot/uImage' -> 'output/uImage'
'arch/arm/boot/zImage' -> 'output/zImage'
Building modules
compile Kernel successful
从主线uboot启动内核，一般使用uImage。
BSP内核配置¶
BSP内核源码在lichee/linux-3.4下。
通过 make ARCH=arm menuconfig 来配置内核。
我们可以使能摄像头需要修改的一些内核配置：
使能USB摄像头驱动：¶
-> Device Drivers
x -> Multimedia support (MEDIA_SUPPORT [=y])
x -> Video capture adapters (VIDEO_CAPTURE_DRIVERS [=y])
x -> V4L USB devices (V4L_USB_DRIVERS [=y])
x -><M> USB Video Class (UVC) CONFIG_USB_VIDEO_CLASS
使能DVP/MIPI摄像头¶
-> Device Drivers
x -> Multimedia support (MEDIA_SUPPORT [=y])
x -> Video capture adapters (VIDEO_CAPTURE_DRIVERS [=y])
x -> V4L platform devices (V4L_PLATFORM_DRIVERS [=y])
x -> SoC camera support (SOC_CAMERA [=y])
x x <M> ov2640 camera support
x x <M> ov5647 camera support
x x <M> sunxi video front end (camera and etc)driver
x x <M> v4l2 driver for SUNXI
<*> sunxi video encoder and decoder support
由于camdriod原始的内核配置是为了在spi nor flash上运行而配置的，没有ext4支持，所以需要额外添加ext4支持：
<*> The Extended 4 (ext4) filesystem
x x [*] Use ext4 for ext2/ext3 file systems (NEW)
x x [*] Ext4 extended attributes (NEW)
x x [ ] Ext4 POSIX Access Control Lists (NEW)
x x [ ] Ext4 Security Labels (NEW)
x x [ ] EXT4 debugging support (NEW)
x x [ ] JBD2 (ext4) debugging support (NEW)
另外还要加上CONFIG_LBDAF（大文件支持，否则无法挂载文件系统）
-> Enable the block layer (BLOCK [=y])
[*] Support for large (2TB+) block devices and files
再加上CGROUPS支持：
-> General setup
[*] Control Group support --->
如果在文件系统（如debian）中使用了SWAP等特性，则还需要在内核中开启SWAP。
debian下还需要开启 FHANDLE 特性，否则会出现以下错误
A start job is running for dev-ttyS0.device
timeout
如果需要使用wifi功能，则还需要勾选RTL8723BS的支持（注意需要选择模块方式），和AW_RF_PM选项。
以及下节所说的fex修改。
uboot启动BSP内核¶
使用主线uboot启动BSP内核，需要修改下启动脚本，放入BSP内核需要的 script.bin 配置文件（相当于主线linux的dtb）
修改boot.cmd:¶
setenv bootargs console=ttyS0,115200 panic=5 rootwait root=/dev/mmcblk0p2 earlyprintk rw
setenv bootm_boot_mode sec
setenv machid 1029
load mmc 0:1 0x41000000 uImage
load mmc 0:1 0x41d00000 script.bin
bootm 0x41000000
重新生成boot.scr:
mkimage -C none -A arm -T script -d boot.cmd boot.scr
将boot.scr放入第一分区。
再配置生成script.bin.
复制一份 lichee/tools/pack/chips/sun8iw8p1/configs/tiger-cdr/sys_config.fex
修改其中的摄像头配置：
首先修改SD卡检测策略，设置为不检测，默认插入
sdc_detmode=3
使能RTL8723bs无线网卡的话，需要使能mmc1，也设置为不检测sd卡。
在设置摄像头型号，csi0是mipi摄像头，csi1是dvp摄像头。
这里默认以mipi摄像头为ov5647, dvp摄像头为ov2640 为例。
;--------------------------------------------------------------------------------
;vip (video input port) configuration
;vip_used: 0:disable 1:enable
;vip_mode: 0:sample one interface to one buffer 1:sample two interface to one buffer
;vip_dev_qty: The quantity of devices linked to capture bus
;
;vip_define_sensor_list: If you want use sensor detect function, please set vip_define_sensor_list = 1, and
; verify that file /system/etc/hawkview/sensor_list_cfg.ini is properly configured!
;
;vip_dev(x)_pos: sensor position, "rear" or "front", if vip_define_sensor_list = 1,vip_dev(x)_pos must be configured!
;
;vip_dev(x)_isp_used 0:not use isp 1:use isp
;vip_dev(x)_fmt: 0:yuv 1:bayer raw rgb
;vip_dev(x)_stby_mode: 0:not shut down power at standby 1:shut down power at standby
;vip_dev(x)_vflip: flip in vertical direction 0:disable 1:enable
;vip_dev(x)_hflip: flip in horizontal direction 0:disable 1:enable
;vip_dev(x)_iovdd: camera module io power handle string, pmu power supply
;vip_dev(x)_iovdd_vol: camera module io power voltage, pmu power supply
;vip_dev(x)_avdd: camera module analog power handle string, pmu power supply
;vip_dev(x)_avdd_vol: camera module analog power voltage, pmu power supply
;vip_dev(x)_dvdd: camera module core power handle string, pmu power supply
;vip_dev(x)_dvdd_vol: camera module core power voltage, pmu power supply
;vip_dev(x)_afvdd: camera module vcm power handle string, pmu power supply
;vip_dev(x)_afvdd_vol: camera module vcm power voltage, pmu power supply
;x indicates the index of the devices which are linked to the same capture bus
;fill voltage in uV, e.g. iovdd = 2.8V, vip_devx_iovdd_vol = 2800000
;fill handle string as below:
;axp22_eldo3
;axp22_dldo4
;axp22_eldo2
;fill handle string "" when not using any pmu power supply
;--------------------------------------------------------------------------------
[csi0]
vip_used = 1
vip_mode = 0
vip_dev_qty = 1
vip_define_sensor_list = 0
vip_csi_mck = port:PE20<3><default><default><default>
vip_csi_sck = port:PE21<2><default><default><default>
vip_csi_sda = port:PE22<2><default><default><default>
vip_dev0_mname = "h22_mipi"
vip_dev0_pos = "rear"
vip_dev0_lane = 1
vip_dev0_twi_id = 0
vip_dev0_twi_addr = 0x60
vip_dev0_isp_used = 1
vip_dev0_fmt = 1
vip_dev0_stby_mode = 0
vip_dev0_vflip = 0
vip_dev0_hflip = 0
vip_dev0_iovdd = ""
vip_dev0_iovdd_vol = 3000000
vip_dev0_avdd = "csi-avdd"
vip_dev0_avdd_vol = 3000000
vip_dev0_dvdd = "csi-dvdd"
vip_dev0_dvdd_vol = 3000000
vip_dev0_afvdd = ""
vip_dev0_afvdd_vol = 2800000
vip_dev0_power_en =
vip_dev0_reset = port:PG00<1><default><default><default>
vip_dev0_pwdn = port:PG01<1><default><default><default>
vip_dev0_flash_en =
vip_dev0_flash_mode =
vip_dev0_af_pwdn =
vip_dev0_act_used = 0
vip_dev0_act_name = "dw9714_act"
vip_dev0_act_slave = 0x18
vip_dev1_mname = ""
vip_dev1_pos = "front"
vip_dev1_lane = 1
vip_dev1_twi_id = 0
vip_dev1_twi_addr =
vip_dev1_isp_used = 0
vip_dev1_fmt = 1
vip_dev1_stby_mode = 0
vip_dev1_vflip = 0
vip_dev1_hflip = 0
vip_dev1_iovdd = ""
vip_dev1_iovdd_vol = 2800000
vip_dev1_avdd = ""
vip_dev1_avdd_vol = 2800000
vip_dev1_dvdd = ""
vip_dev1_dvdd_vol = 1500000
vip_dev1_afvdd = ""
vip_dev1_afvdd_vol = 2800000
vip_dev1_power_en =
vip_dev1_reset =
vip_dev1_pwdn =
vip_dev1_flash_en =
;fill handle string as below:
;axp22_eldo3
;axp22_dldo4
;axp22_eldo2
;fill handle string "" when not using any pmu power supply
;--------------------------------------------------------------------------------
[csi0]
vip_used = 1
vip_mode = 0
vip_dev_qty = 1
vip_define_sensor_list = 0
vip_csi_mck = port:PE20<3><default><default><default>
vip_csi_sck = port:PE21<2><default><default><default>
vip_csi_sda = port:PE22<2><default><default><default>
vip_dev0_mname = "h22_mipi"
vip_dev0_pos = "rear"
vip_dev0_lane = 1
vip_dev0_twi_id = 0
vip_dev0_twi_addr = 0x60
vip_dev0_isp_used = 1
vip_dev0_fmt = 1
vip_dev0_stby_mode = 0
vip_dev0_vflip = 0
vip_dev0_hflip = 0
vip_dev0_iovdd = ""
vip_dev0_iovdd_vol = 3000000
vip_dev0_avdd = "csi-avdd"
vip_dev0_avdd_vol = 3000000
vip_dev0_dvdd = "csi-dvdd"
vip_dev0_dvdd_vol = 3000000
vip_dev0_afvdd = ""
vip_dev0_afvdd_vol = 2800000
vip_dev0_power_en =
vip_dev0_reset = port:PG00<1><default><default><default>
vip_dev0_pwdn = port:PG01<1><default><default><default>
vip_dev0_flash_en =
vip_dev0_flash_mode =
vip_dev0_af_pwdn =
vip_dev0_act_used = 0
vip_dev0_act_name = "dw9714_act"
vip_dev0_act_slave = 0x18
vip_dev1_mname = ""
vip_dev1_pos = "front"
vip_dev1_lane = 1
vip_dev1_twi_id = 0
vip_dev1_twi_addr =
vip_dev1_isp_used = 0
vip_dev1_fmt = 1
vip_dev1_stby_mode = 0
vip_dev1_vflip = 0
vip_dev1_hflip = 0
vip_dev1_iovdd = ""
vip_dev1_iovdd_vol = 2800000
vip_dev1_avdd = ""
vip_dev1_avdd_vol = 2800000
vip_dev1_dvdd = ""
vip_dev1_dvdd_vol = 1500000
vip_dev1_afvdd = ""
vip_dev1_afvdd_vol = 2800000
vip_dev1_power_en =
vip_dev1_reset =
vip_dev1_pwdn =
vip_dev1_flash_en =
vip_dev1_flash_mode =
vip_dev1_af_pwdn =
[csi1]
vip_used = 0
vip_mode = 0
vip_dev_qty = 1
vip_define_sensor_list = 0
vip_csi_pck = port:PE00<2><default><default><default>
vip_csi_mck = port:PE01<2><default><default><default>
vip_csi_hsync = port:PE02<2><default><default><default>
vip_csi_vsync = port:PE03<2><default><default><default>
vip_csi_d0 = port:PE04<2><default><default><default>
vip_csi_d1 = port:PE05<2><default><default><default>
vip_csi_d2 = port:PE06<2><default><default><default>
vip_csi_d3 = port:PE07<2><default><default><default>
vip_csi_d4 = port:PE08<2><default><default><default>
vip_csi_d5 = port:PE09<2><default><default><default>
vip_csi_d6 = port:PE10<2><default><default><default>
vip_csi_d7 = port:PE11<2><default><default><default>
vip_csi_d8 = port:PE12<2><default><default><default>
;vip_csi_d9 = port:PE13<2><default><default><default>
vip_csi_d10 = port:PE14<2><default><default><default>
vip_csi_d11 = port:PE15<2><default><default><default>
vip_csi_sck = port:PE21<2><default><default><default>
vip_csi_sda = port:PE22<2><default><default><default>
vip_dev0_mname = "ov5640"
vip_dev0_pos = "front"
vip_dev0_twi_id = 4
vip_dev0_twi_addr = 0x78
vip_dev0_isp_used = 0
vip_dev0_fmt = 0
vip_dev0_stby_mode = 0
vip_dev0_vflip = 0
vip_dev0_hflip = 0
vip_dev0_iovdd = ""
vip_dev0_iovdd_vol = 2800000
vip_dev0_avdd = ""
vip_dev0_avdd_vol = 2800000
vip_dev0_dvdd = ""
vip_dev0_dvdd_vol = 1500000
vip_dev0_afvdd = ""
vip_dev0_afvdd_vol = 2800000
vip_dev0_power_en =
vip_dev0_reset = port:PE23<1><default><default><default>
vip_dev0_pwdn = port:PE24<1><default><default><default>
vip_dev0_flash_en =
vip_dev0_flash_mode =
vip_dev0_af_pwdn =
vip_dev0_act_used = 0
vip_dev0_act_name = "ad5820_act"
vip_dev0_act_slave = 0x18
vip_dev1_mname = "gc2035"
vip_dev1_pos = "front"
vip_dev1_lane = 1
vip_dev1_twi_id = 4
vip_dev1_twi_addr = 0x78
vip_dev1_isp_used = 0
vip_dev1_fmt = 1
vip_dev1_stby_mode = 0
vip_dev1_vflip = 0
vip_dev1_hflip = 0
vip_dev1_iovdd = ""
vip_dev1_iovdd_vol = 2800000
vip_dev1_avdd = ""
vip_dev1_avdd_vol = 2800000
vip_dev1_dvdd = ""
vip_dev1_dvdd_vol = 1500000
vip_dev1_afvdd = ""
vip_dev1_afvdd_vol = 2800000
vip_dev1_power_en =
vip_dev1_reset =
vip_dev1_pwdn =
vip_dev1_flash_en =
vip_dev1_flash_mode =
vip_dev1_af_pwdn =
将其中的摄像头信息改成自己使用的摄像头信息。
保存，并使用
fex2bin sys_config.fex script.bin 生成script.bin文件。将script.bin也放入第一分区。
再将前面编译的uImage放入第一分区。
此时就可以使用主线Uboot启动bsp内核了。