开发板如何适配OpenHarmony3.2
开发板如何适配OpenHarmony3.2（文章已获得原作者诚迈科技高级技术专家-陆道授权）
简介
OpenHarmony3.2 Beta5 版本在 OpenHarmony 3.1 Release 版本的基础上，有以下改变：性能上有很大的提升、标准系统应用开发框架增强、标准系统分布式能力增强。
本文介绍诚迈科技基于RK3568设计的HCPAD-100开发板以及基于RK3566设计的中控屏HongzPad2022在OpenHarmony 3.2 Beta5 版本上的适配过程。
涉及到开发板的添加/u-boot /linux-5.10/分区表/根文件系统/显示/触摸/USB的移植过程以及 OpenHarmony 所依赖的驱动特性介绍。
如何添加新的开发板进行编译
参照DAYU200的工程配置文件我们新建自己的编译命令。
1)在device/board/目录新建archermind目录，新建rk3568/rk3588/rk3399目录，并添加相关的工程文件。
2)在vendor目录新建archermind目录。新建以下几个目录，并添加相关的工程文件。
3) 修改vendor/archermind/hongzos_rk3568/config.json文件，product_name改成hongzos_rk3568，device_build_path改成第一步新建的目录。
{"product_name": "hongzos_rk3568","device_company": "rockchip","device_build_path": "device/board/archermind/rk3568","target_cpu": "arm","type": "standard","version": "3.0","board": "rk3568",通过./build.sh --product-name hongzos_rk3568来编译出我们自己开发板的镜像，编译完后对应开发板的image镜像放在out/rk3568/packages/phone/目录。相关代码放在文章最后的参考链接。
U-Boot移植
U-boot是通过二进制镜像直接放在device/board/hihope/rk3568/loader目录下的，这个目录下涉及到文件如下
1)下载rk官方发布的uboot源码
git clone https://github.com/rockchip-linux/u-boot.git2)修改make.sh, 指定RKBIN_TOOLS的路径
RKBIN_TOOLS=rkbin/tools3）增加代码读取ramdisk分区到指定的内存位置，修改cmd/pxe.c
include "boot_rkimg.h"#define BLK_CNT(_num_bytes, _block_size) \ ((_num_bytes + _block_size - 1) / _block_size)static char* load_ramdisk_from_partition(void *buffer){ struct blk_desc *desc = rockchip_get_bootdev(); disk_partition_t part_ramdisk_boot; static char initrd_str; long blk_cnt = 0, blks_read = 0; long blk_start = 0; if (part_get_info_by_name(desc, "ramdisk", &part_ramdisk_boot) < 0) { printf("No ramdisk partition\n"); return NULL; } blk_cnt = part_ramdisk_boot.size; blk_start = part_ramdisk_boot.start; printf("Load from partition ' ramdisk ' to address 0x%p, count: %ld total block(s) by ludao\n", buffer, blk_cnt); blks_read = blk_dread(desc, blk_start, blk_cnt, buffer); if (blks_read != blk_cnt) { return NULL; } printf("Read from partition ' ramdisk ' done, from 0x%lx total block(s) 0x%lx\n", blk_start, blk_cnt); sprintf(initrd_str, "0x%p:0x%lx", buffer, blk_cnt*(part_ramdisk_boot.blksz)); printf("Openharmony ramdisk_addr_r = %s\n", initrd_str); return initrd_str;}static int label_boot(cmd_tbl_t *cmdtp, struct pxe_label *label) if (label->initrd) { if (get_relfile_envaddr(cmdtp, label->initrd, "ramdisk_addr_r") < 0) { printf("Skipping %s for failure retrieving initrd\n", label->name); return 1; } bootm_argv = initrd_str; strncpy(bootm_argv, env_get("ramdisk_addr_r"), 18); strcat(bootm_argv, ":"); strncat(bootm_argv, env_get("filesize"), 9); }else{ void *buffer = (void *)env_get_ulong("ramdisk_addr_r", 16, 0); bootm_argv = load_ramdisk_from_partition(buffer); if(bootm_argv){ printk("initrd = %s \n", bootm_argv); } }4）指定交叉编译器和平台开始编译，编译完成后根目录会生成u-boot.bin
./make.sh CROSS_COMPILE=aarch64-linux-gnu- rk3568所有相关代码已经放到开源社区，大家可以下载下来直接编译使用，相关代码放在文章最后的参考链接。
linux-5.10移植
1）内核编译脚本
linux编译脚本的是放在device/board/hihope/rk3568/kernel目录下的build_kernel.sh文件，由于kernel/linux/linux-5.10是公共代码，OpenHarmony 编译脚本是通过打补丁的方式来适配不同平台，不同的平台有自己的内核补丁。
编译脚本会先把 kernel/linux/linux-5.10 拷贝到out/kernel/src_tmp/linux-5.10/，然后打上3568的内核补丁patch -p1 < kernel/linux/patches/linux-5.10/rk3568_patch/kernel.patch
后编译生成自己的镜像，不利于我们开发，我们自己开发过程中做如下修改，这样方便我们开发过程中的修改。
先进入kernel/linux/linux-5.10目录patch -p1 < kernel/linux/patches/linux-5.10/rk3568_patch/kernel.patch修改device/board/hihope/rk3568/kernel/build_kernel.sh注释掉 //patch -p1 < ${KERNEL_PATCH}2) 设备树的定制，首先我们需要有自己的板子的设备树例如rk3568-chujue-linux.dts
把设备树放到kernel/linux/linux-5.10/arch/arm64/boot/dts/rockchip/目录修改kernel/linux/linux-5.10/ make-ohos.shmodel_list=( "TB-RK3568X0 arm64 0xfe660000 rk3568-toybrick-x0-linuxImage rockchip_linux_defconfig" "TB-RK3568X10arm64 0xfe660000 rk3568-toybrick-x10-linux Image rockchip_linux_defconfig")CONFIG_DRM_PANEL_SIMPLE = ykernel/linux/linux-5.10/drivers/gpu/drm/panel/panel-simple.c注释掉//int panel_simple_loader_protect(struct drm_panel *panel)
5）启动参数的定制
kernel/linux/linux-5.10/ make-ohos.sh
cmdline="append earlycon=uart8250,mmio32,${uart} root=PARTUUID=614e0000-0000-4b53-8000-1d28000054a9 rw rootwait rootfstype=ext4FIRMWARE_VER:11.0MACHINE_MODEL:rk3568_rMACHINE_ID:007MANUFACTURER: rockchipMAGIC: 0x5041524BATAG: 0x00200800MACHINE: rk3568_rCHECK_MASK: 0x80PWR_HLD: 0,0,A,0,1TYPE: GPTCMDLINE:mtdparts=rk29xxnand:0x00002000@0x00002000(uboot),0x00002000@0x00004000(misc),0x00003000@0x00006000(resource),0x00030000@0x00009000(boot_linux:bootable),0x00002000@0x00039000(ramdisk),0x00400000@0x0003B000(system),0x00200000@0x0043B000(vendor),0x00019000@0x0063B000(sys-prod),0x00019000@0x00654000(chip-prod),0x00010000@0x0066D000(updater),-@0x0067D000(userdata:grow)uuid:system=614e0000-0000-4b53-8000-1d28000054a9uuid:boot_linux=a2d37d82-51e0-420d-83f5-470db993dd35device/board/hihope/rk3568/cfg/fstab.rk3568
# fstab file.# /dev/block/platform/fe310000.sdhci/by-name/system /usr ext4 ro,barrier=1wait,required/dev/block/platform/fe310000.sdhci/by-name/vendor /vendor ext4 ro,barrier=1wait,required/dev/block/platform/fe310000.sdhci/by-name/sys-prod /sys_prod ext4 ro,barrier=1wait/dev/block/platform/fe310000.sdhci/by-name/chip-prod /chip_prod ext4 ro,barrier=1wait/dev/block/platform/fe310000.sdhci/by-name/userdata /data f2fs discard,noatime,nosuid,nodev,fscrypt=2:aes-256-cts:aes-256-xtswait,check,fileencryption=software,quota/dev/block/platform/fe310000.sdhci/by-name/misc /misc none none wait,required
根文件系统
1) ramdisk从3.1到3.2的变化
3.1中ramdisk.Img是放在out/kernel/src_tmp/linux-5.10/boot_linux/目录下被打包到boot_linux.img中。
3.2的ramdisk.Img是直接放在单独的分区里面，由Boot在开机的模式不同的情况下选择加载不同的根文件系统
2）如何修改ramdisk
在.gn文件里面添加对应的配置文件，生成的文件将会被放到ramdisk镜像里面
image_list += [ "ramdisk", "updater_ramdisk", ]CONFIG_DRM_PANEL_SIMPLE=yCONFIG_DRM_ANALOGIX_DP=yCONFIG_DRM_DW_HDMI=yCONFIG_DRM_DW_HDMI_I2S_AUDIO=yCONFIG_DRM_DW_HDMI_CEC=yCONFIG_DRM_DW_MIPI_DSI=y
显示HDI需要适配两部分：gralloc 和 display_device。
display device适配
display device模块提供显示设备管理、layer管理、硬件加速等功能。
drm设备节点定义在//device/soc/rockchip/rk3568/hardware/display/src/display_device/drm_device.cpp文件中，可根据实际情况修改.
std::shared_ptr DrmDevice::Create(){ DISPLAY_DEBUGLOG(); if (mDrmFd == nullptr) { const std::string name("rockchip"); int drmFd = open("/dev/dri/card0", O_RDWR | O_CLOEXEC); // drmOpen(name.c_str(), nullptr);}如开发板不支持硬件合成或是有问题的时候，需要在drm_display.cpp文件中跳过gfx的初始化
int32_t DrmDisplay::Init(){ ... ... ret = preComp->Init(); // gfx初始化，这里需要跳过 DISPLAY_CHK_RETURN((ret != DISPLAY_SUCCESS), DISPLAY_FAILURE, DISPLAY_LOGE("can not init HdiGfxComposition"));// 或者不判断返回值}同时在//device/soc/rockchip/rk3568/hardware/display/src//hdi_gfx_composition.cpp文件中修改set_layers方法，全部使用CPU合成显示
int32_t HdiGfxComposition::SetLayers(std::vector &layers, HdiLayer &clientLayer){#if 0 // CPU合成 layer->SetDeviceSelect(COMPOSITION_CLIENT);#else if ((layer->GetCompositionType() != COMPOSITION_VIDEO) && (layer->GetCompositionType() != COMPOSITION_CURSOR)) { layer->SetDeviceSelect(COMPOSITION_DEVICE); } else { layer->SetDeviceSelect(layer->GetCompositionType()); }#endif}
drm设备节点定义在//device/soc/rockchip/rk3568/hardware/display/src/display_gralloc/display_gralloc_gbm.c文件中，可根据实际情况修改
const char *g_drmFileNode = "/dev/dri/card0";
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