rv1126 SDK编译【2020-0912版本SDK包】
一、原材料说明
rv1126_1109.tar.gz，购买自某宝，版本为2020-0912版本。其他版本sdk包可能会遇到不同的问题，以下记录仅供参考。
2020-0912版本，rkmedia库好像没有完成类海思接口封装，至少VO部分还没有封装。
另外，在此鄙视一下某宝rk sdk包商家。海思sdk购买后，免费更新，rk却每个新版本都要重新购买。
备注：后续重新购买了2020-1212版本的SDK包，编译除了下面说的找不到3个库（错误三）外，没有其他问题。
二、编译步骤
1. 解压压缩包
user@PC:~/work/sdk/rv1126$ tar xzf rv1126_1109.tar.gz -C ~/work/sdk/rv1126
user@PC:~/work/sdk/rv1126$ ls
CBuild Makefile app build.sh buildroot device docs envsetup.sh external kernel mkfirmware.sh prebuilts rkbin rkflash.sh rockdev tools u-boot
docs目录下有相关说明文档，docs\doc.txt、docs\docs_list.txt2个文档说明了docs目录结构，可以参考、查阅相关手册。
可以执行./build.sh --help查看帮助说明：
user@PC:~/work/sdk/rv1126$ ./build.sh --help
Usage: build.sh [OPTIONS]
Available options:
BoardConfig*.mk -switch to specified board config
uboot -build uboot
spl -build spl
loader -build loader
kernel -build kernel
modules -build kernel modules
toolchain -build toolchain
rootfs -build default rootfs, currently build buildroot as default
buildroot -build buildroot rootfs
ramboot -build ramboot image
multi-npu_boot -build boot image for multi-npu board
yocto -build yocto rootfs
debian -build debian9 stretch rootfs
distro -build debian10 buster rootfs
pcba -build pcba
recovery -build recovery
all -build uboot, kernel, rootfs, recovery image
cleanall -clean uboot, kernel, rootfs, recovery
firmware -pack all the image we need to boot up system
updateimg -pack update image
otapackage -pack ab update otapackage image
save -save images, patches, commands used to debug
allsave -build all & firmware & updateimg & save
Default option is 'allsave'.
2. 编译uboot、内核
这部分按说明文档编译，没有遇到问题。
编译u-boot：./build.sh uboot；
编译内核：./build.sh kernel；
3. 编译rootfs
a. 选择目标单板，输入对应编号：
user@PC:~/work/sdk/rv1126$ ./envsetup.sh
This script is executed directly...
Top of tree: /home/user/work/sdk/rv1126
You're building on Linux
Lunch menu...pick a combo:
0. non-rockchip boards
1. rockchip_px30_32
2. rockchip_px30_64
3. rockchip_px30_64_opensource
......
64. rockchip_rv1126_robot
65. rockchip_rv1126_robot_recovery
66. rockchip_rv1126_rv1109
67. rockchip_rv1126_rv1109_facial_gate
68. rockchip_rv1126_rv1109_libs
69. rockchip_rv1126_rv1109_ramboot_uvcc
70. rockchip_rv1126_rv1109_recovery
71. rockchip_rv1126_rv1109_sl
72. rockchip_rv1126_rv1109_spi_nand
73. rockchip_rv1126_rv1109_systemd
74. rockchip_rv1126_rv1109_tb
75. rockchip_rv1126_rv1109_tinyrootfs
76. rockchip_rv1126_rv1109_toolchain
77. rockchip_rv1126_rv1109_uvcc
Which would you like? [0]: 67
b. 编译：
user@PC:~/work/sdk/rv1126$ ./build.sh rootfs
processing board option: rootfs
processing option: rootfs
==========Start build buildroot==========
TARGET_BUILDROOT_CONFIG=rockchip_rv1126_rv1109
=========================================
Top of tree: /home/user/work/sdk/rv1126
===========================================
#TARGET_BOARD=rv1126
#OUTPUT_DIR=output/rockchip_rv1126_rv1109
#CONFIG=rockchip_rv1126_rv1109_defconfig
===========================================
make: Entering directory '/home/user/work/sdk/rv1126/buildroot'
错误一：
错误：
2020-12-08T20:10:30 umask 0022 && make -C /home/user/work/sdk/rv1126/buildroot O=/home/user/work/sdk/rv1126/buildroot/output/rockchip_rv1126_rv1109
2020-12-08T20:10:46
2020-12-08T20:10:46 You seem to have the current working directory in your
2020-12-08T20:10:46 LD_LIBRARY_PATH environment variable. This doesn't work.
2020-12-08T20:10:46 make[1]: *** [support/dependencies/dependencies.mk:25: core-dependencies] Error 1
2020-12-08T20:10:47 make: *** [/home/user/work/sdk/rv1126/buildroot/output/rockchip_rv1126_rv1109/Makefile:16: _all] Error 2
Command exited with non-zero status 1
you take 0:18.89 to build builroot
====Build buildroot failed!====
解决：
需要先清空系统环境变量中的LD_LIBRARY_PATH：export LD_LIBRARY_PATH=。
错误二：
错误：
2020-12-08T18:42:19 CMake Error at rkisp_api/CMakeLists.txt:12 (PROJECT):
2020-12-08T18:42:19 The CMAKE_CXX_COMPILER:
2020-12-08T18:42:19
2020-12-08T18:42:19 /home/ubuntu/Develop/rockchip/rv1109/external/camera_engine_rkaiq/../../prebuilts/gcc/linux-x86/arm/gcc-arm-8.3-2019.03-x86_64-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-g++
解决：
买的sdk包中，external/camera_engine_rkaiq/目录下cmake配置的交叉编译工具目录错误，用指令进行替换``：
sed -i "s/\/home\/ubuntu\/Develop\/rockchip\/rv1109/\/home\/user\/work\/sdk\/rv1126/g" `grep "/home/ubuntu/Develop/rockchip/rv1109" -rl ./`
sed -i "s/原字符串/新字符串/g" `grep 原字符串 -rl 所在目录`
错误三：
错误：
编译camera_engine_rkaiq，最后链接生成动态库时，提示缺少下面3个库：
/lib/libc.so.6
/lib/ld-linux-armhf.so.3
/usr/lib/ibc_nonshared.a
解决：
检查external/camera_engine_rkaiq/目录下CMakeLists.txt，好像没有找到sysroot设置错误，这个问题没发现最终原因。解决办法是在PC的Linux系统的对应目录里，建了3个软链接，链接到交叉编译工具目录下这3个库文件。
错误四：
错误及解决：
编译libIPCProtocol编译问题。
购买的这个sdk包，开始提示dbus.c中的dbus_signal_func_t没有定义。如果这时修改app/libIPCProtocol/dbus.c文件，增加头文件包含"#include dbus_signal.h"，然后删除buildroot/output/rockchip_rv1126_rv1109/build/lib IPCProtocol目录，重新执行：
user@PC:~/work/sdk/rv1126$ .export LD_LIBRARY_PATH=
user@PC:~/work/sdk/rv1126$ ./build.sh rootfs
这时dbus_signal_func_t没有定义的问题解决了，但编译到最后链接时，会提示很多函数重复定义了，仔细看是dbus.c、dbus_signal.c两个文件实现了两套同样接口的函数。暂时解决是直接删除了dbus.c、dbus.h，然后再次删除buildroot/output/rockchip_rv1126_rv1109/build/libIPCProtocol目录，重新编译。