class="markdown_views prism-dracula"> 2019-02-19 内部培训，补充设计思想等内容。

设计思想

我们启动一个嵌入式Linux系统需要什么，下面这4个是最基本的配置项。

1. uboot
2. kernel
3. 根文件系统
4. 设备树

通常的启动流程为： uboot -> kernel 对于一些SOC来说，它的内部SRAM可能会比较小（比如freescale T2080的512KB），小到无法装载下一个完整的uboot镜像，那么就需要spl（Secondary Program Loader），它主要负责初始化外部RAM和环境，并加载真正的uboot镜像到外部RAM中来执行。此时的启动流程为： spl -> uboot -> kernel 另外，根据板卡或者的特性，还需要额外的配置项。比如xilinx zynq，zynq内部包含了一个双核A9 ARM（PS），和一个FPGA（PL），相当于CPU+FPGA的板卡，这里的CPU可以是i.MX8等，FPGA正常工作需要下载配置文件，在CPU FPGA分立的板子上，FPGA配置文件可由自己配置Flash单独加载，在zynq里，这个工作由PS部分负责。xilinx zynq的spl不是uboot中的的spl，而是官方开发的称之为fsbl程序，fsbl可以下载PL，加载uboot，但uboot也可以加载PL，如果zynq里用到PL部分，则启动流程为： fsbl -> pl -> uboot -> kernel 或， fsbl -> uboot -> pl -> kernel 对于xilinx zynq ultrascale+，多了pmu（peripheral manage unit）firmware和atf（arm trusted firmware），启动流程为： fsbl -> pmu firmware -> atf -> uboot -> pl -> kernel

文件目录组织

settings.sh为环境变量脚本，fdk为编译工具， zc@ubuntu:~/program/fdk$ ls -l total 120 drwxrwxr-x 6 zc zc 4096 Feb 19 10:17 bsp drwxrwxr-x 2 zc zc 4096 Dec 25 15:19 etc -rwxrwxr-x 1 zc zc 109632 Jan 22 20:28 fdk -rwxrwxr-x 1 zc zc 2344 Jan 22 19:33 settings.sh bsp目录如下，对应不同的平台的bsp子目录，包含uboot，内核等源代码等。 zc@ubuntu:~/program/fdk$ ls -l bsp total 16 drwxr-xr-x 6 zc zc 4096 Jan 17 16:20 t2080 drwxrwxr-x 4 zc zc 4096 Jan 8 11:03 x86 drwxrwxr-x 7 zc zc 4096 Jan 17 16:20 zynq drwxrwxr-x 9 zc zc 4096 Jan 22 20:07 zynqmp zynqmp平台的bsp，包含所有用到的配置项的源代码。 zc@ubuntu:~/program/fdk$ ls -l bsp/zynqmp/ total 14608 drwxrwxr-x 18 zc zc 4096 Dec 5 17:09 arm-trusted-firmware-v2018.2 drwxrwxr-x 67 zc zc 4096 May 30 2018 device-tree-xlnx-v2018.2 drwxrwxr-x 7 zc zc 4096 Dec 5 17:09 embeddedsw-v2018.2 drwxrwxr-x 26 zc zc 4096 Feb 18 14:29 linux-xlnx-v2018.2 drwxrwxr-x 7 zc zc 4096 Dec 12 16:58 package-v2018.2 -rw-rw-r-- 1 zc zc 181 Jan 17 16:20 readme.txt -rw-r--r-- 1 zc zc 7428054 Dec 25 09:41 rootfs-v2018.2.cpio.gz -rw-r--r-- 1 zc zc 7494357 Dec 25 09:41 rootfs-v2018.2.ext4.gz drwxrwxr-x 25 zc zc 4096 Jan 24 11:40 u-boot-xlnx-v2018.2 zynq平台的bsp，包含所有用到的配置项的源代码。 zc@ubuntu:~/program/fdk$ ls -l bsp/zynq total 6216 drwxrwxr-x 57 zc zc 4096 Jun 26 2015 device-tree-xlnx-v2015.2.1 drwxrwxr-x 7 zc zc 4096 Dec 5 17:09 embeddedsw-v2018.2 drwxrwxr-x 24 zc zc 4096 Jan 22 20:01 linux-xlnx-v2015.2.1 drwxrwxr-x 7 zc zc 4096 Dec 12 16:58 package-v2015.2.1 -rw-rw-r-- 1 zc zc 181 Jan 17 16:20 readme.txt -rw-rw-r-- 1 zc zc 6336565 Dec 24 11:04 rootfs-v2015.2.1.cpio.gz drwxrwxr-x 22 zc zc 4096 Jan 16 19:46 u-boot-xlnx-v2015.2.1 t2080平台的bsp，包含所有用到的配置项的源代码。 zc@ubuntu:~/program/fdk$ ls -l bsp/t2080/ total 32448 drwxrwxr-x 2 zc zc 4096 Dec 5 17:09 device-tree-qoriq-v2.0 drwxrwxr-x 24 zc zc 4096 Feb 14 17:28 linux-qoriq-v2.0 drwxrwxr-x 7 zc zc 4096 Jan 15 19:09 package-v2.0 -rw-rw-r-- 1 zc zc 181 Jan 17 16:20 readme.txt -rw-r--r-- 1 zc zc 33203510 Jan 15 18:52 rootfs-v2.0.ext2.gz drwxrwxr-x 22 zc zc 4096 Jan 23 21:22 u-boot-qoriq-v2.0 x86平台的bsp，适用于ubuntu16.04.4操作系统。 zc@ubuntu:~/program/fdk$ ls -l bsp/x86/ total 8 drwxrwxr-x 29 zc zc 4096 Jan 10 16:09 linux-source-4.13.0 drwxrwxr-x 7 zc zc 4096 Jan 8 11:03 package-v16.04.4

revision

2018年11月20日 10:22:40

添加对Xilinx zynqmp petalinux-v2018.2的支持。 zc@ubuntu:~/project/petalinux/zynq-v2015.2.1$ fdk -h Usage: fdk [OPTION...] Examples: fdk -t xilinx -p ~/x.hdf # Create workspace in current path. fdk -t xilinx -p ~/x.hdf -s ~/mwm # Create workspace in ~/mwm. fdk -c kernel menu # Open kernel menuconfig. fdk -c uboot menu # Open kernel menuconfig. fdk -b all # Build all component of project. fdk -b kernel # Build kernel of project. fdk -b uboot # Build uboot of project. fdk -d all # Clean all component of project. fdk -d kernel # Clean kernel of project. fdk -d uboot # Clean uboot of project. fdk -k boot mini # Packet BOOT.BIN for xilinx in [mini] mode. fdk -k boot normal -g ./mwm.bit # Packet BOOT.BIN for xilinx in [normal] mode. fdk -k dftfs ext4 # Install default rootfs ext4 image. fdk -k rootfs ext4 # Packet rootfs into ext4 image. fdk -k fit zImage # Packet FIT image. fdk -h # Show help fdk -v # Show version information. Main operation mode: -t <target>: project target[xilinx, nxp] -s <path>: workspace path -p <path>: hdf path, for target xilinx -u <component>: update component[fsbl, pmufw, dts] -c <component> <mode>: config component[uboot, kernel] with mode[init, menu] -b <component>: build component[all | fsbl, pmufw, atf, uboot, kernel, dtb, dts] misc[ubootenvtool, modules, modules_install] -d <component>: clean component[all | fsbl, pmufw, atf, uboot, kernel] bsp[bsp] -k <type> <mode>: packet image with type[boot, rootfs, fit] boot: packet bootloader for xilinx device with mode[mini, normal] mini: fsbl and uboot for zynq fsbl, pmufw, atf, uboot for zynqmp normal: mode[mini] + FPGA bitstream rootfs: packet rootfs with mode[all | cpio, ext2, ext4] fsroot: extract rootfs from type[cpio, ext2, ext4] dftfs: install default rootfs with mode[all | cpio, ext2, ext4] fsdft: set project rootfs as default rootfs with mode[all | cpio, ext2, ext4] fsurd: packet rootfs into uboot format[all | cpio, ext2, ext4] fsapp: install app into project rootfs fslibso: install lib *.so into project rootfs fsmod: install module into project rootfs fsdpm: depmod project rootfs fit: packet kernel, rootfs and dtb Image: kernel Image for zynqmp zImage: kernel zImage for zynq gzip: compress kernel Image with gzip for zynqmp uImage: packet kernel into uImage format -g <path>: bit path, when packet boot image in normal mode -h: show this help -v: show version information zc@ubuntu:~/project/petalinux/zynq-v2015.2.1$ fdk -v Version: fdk path: /home/zc/program/fdk fdk version: 1.0.0 petalinux path: /home/zc/program/petalinux-v2018.2-final petalinux version: 2018.2 Revision: fdk is a fast developing kit for embedded linux, target for xilinx[zynq/zynqmp], nxp[t2080] Time Author Revision 2018-09-17 Zhu Ce Initial release, support xilinx zynqmp with petalinux-v2017.4 2018-10-02 Zhu Ce Add support for xilinx zynq with petalinux-v2017.4 2018-10-05 Zhu Ce Add support for nxp t2080 with qoriq-sdk-2.0 2018-11-01 Zhu Ce Add support for xilinx zynq with petalinux-v2015.2.1 2018-11-20 Zhu Ce Add support for xilinx zynqmp with petalinux-v2018.2

2018年11月01日 11:01:40

添加对Xilinx zynq petalinux-v2015.2.1的支持。 zc@ubuntu:~/project/petalinux/zynq-v2015.2.1$ fdk -h Usage: fdk [OPTION...] Examples: fdk -t xilinx -p ~/x.hdf # Create workspace in current path. fdk -t xilinx -p ~/x.hdf -s ~/mwm # Create workspace in ~/mwm. fdk -c kernel menu # Open kernel menuconfig. fdk -c uboot menu # Open kernel menuconfig. fdk -b all # Build all component of project. fdk -b kernel # Build kernel of project. fdk -b uboot # Build uboot of project. fdk -d all # Clean all component of project. fdk -d kernel # Clean kernel of project. fdk -d uboot # Clean uboot of project. fdk -k boot mini # Packet BOOT.BIN for xilinx in [mini] mode. fdk -k boot normal -g ./mwm.bit # Packet BOOT.BIN for xilinx in [normal] mode. fdk -k dftfs ext4 # Install default rootfs ext4 image. fdk -k rootfs ext4 # Packet rootfs into ext4 image. fdk -k fit zImage # Packet FIT image. Main operation mode: -t <target>: project target[xilinx, nxp] -s <path>: workspace path -p <path>: hdf path, for target xilinx -u <component>: update component[fsbl, pmufw, dts] -c <component> <mode>: config component[uboot, kernel] with mode[init, menu] -b <component>: build component[all | fsbl, pmufw, atf, uboot, kernel, dtb, dts] misc[ubootenvtool] -d <component>: clean component[all | fsbl, pmufw, atf, uboot, kernel] bsp[bsp] -k <type> <mode>: packet image with type[boot, rootfs, fit] boot: packet bootloader for xilinx device with mode[mini, normal] mini: fsbl and uboot for zynq fsbl, pmufw, atf, uboot for zynqmp normal: mode[mini] + FPGA bitstream rootfs: packet rootfs with mode[all | cpio, ext4] dftfs: install default rootfs with mode[all | cpio, ext4] fit: packet kernel, rootfs and dtb Image: kernel Image for zynqmp zImage: kernel zImage for zynq gzip: compress kernel Image with gzip for zynqmp uImage: packet kernel into uImage format urd: packet rootfs into uboot format -g <path>: bit path, when packet boot image in normal mode -h: show this help Revision: fdk is a fast developing kit for embedded linux, target for xilinx[zynq/zynqmp], nxp[t2080] Time Author Revision 2018-09-17 Zhu Ce Initial release, support xilinx zynqmp with petalinux-v2017.4 2018-10-02 Zhu Ce Add support for xilinx zynq with petalinux-v2017.4 2018-10-05 Zhu Ce Add support for nxp t2080 with qoriq-sdk-2.0 2018-11-01 Zhu Ce Add support for xilinx zynq with petalinux-v2015.2.1

2018年10月06日 22:54:40

添加对NXP（Freescale） T2080的支持，尚未在项目中验证验证。 zc@ubuntu:~/fdk_develope$ fdk -h Usage: fdk [OPTION...] Examples: fdk -t xilinx -p ~/hdf # Create workspace in current path. fdk -t xilinx -p ~/hdf -s ~/mwm # Create workspace in ~/mwm. fdk -c kernel menu # Open kernel menuconfig. fdk -c uboot menu # Open kernel menuconfig. fdk -b all # Build all component of project. fdk -b kernel # Build kernel of project. fdk -b uboot # Build uboot of project. fdk -d all # Clean all component of project. fdk -d kernel # Clean kernel of project. fdk -d uboot # Clean uboot of project. fdk -k boot mini # Packet BOOT.BIN for xilinx in [mini] mode. fdk -k boot normal -g ./mwm.bit # Packet BOOT.BIN for xilinx in [normal] mode. fdk -k rootfs # Packet rootfs. fdk -k fit # Packet FIT image. Main operation mode: -t <target>: project target[xilinx, nxp] -s <path>: workspace path -p <path>: hdf path, for target xilinx -u <component>: update component[fsbl, pmufw, dts] -c <component> <mode>: config component[uboot, kernel] with mode[init, menu] -b <component>: build component[all | fsbl, pmufw, atf, uboot, kernel, dtb, dts] misc[ubootenvtool] -d <component>: clean component[all | fsbl, pmufw, atf, uboot, kernel] bsp[bsp] -k <type> <mode>: packet image with type[boot, rootfs, fit] boot: packet bootloader for xilinx device with mode[mini, normal] mini: fsbl and uboot for zynq fsbl, pmufw, atf, uboot for zynqmp normal: mode[mini] + FPGA bitstream rootfs: packet rootfs with mode[all | cpio, ext4] fit: packet kernel, rootfs and dtb -g <path>: bit path, when packet boot image in normal mode -h: show this help Revision: fdk is a fast developing kit for embedded linux, target for xilinx[zynq/zynqmp], nxp[t2080] Time Author Revision 2018-09-17 Zhu Ce Initial release, support xilinx zynqmp with petalinux-v2017.4 2018-10-02 Zhu Ce Add support for xilinx zynq with petalinux-v2017.4 2018-10-05 Zhu Ce Add support for nxp t2080 with qoriq-sdk-2.0

2018年10月03日 18:54:40

自己实践中总结的一套开发工具，包括了常用的工具集我已经制作好发布在根文件系统中，目前支持Xilinx zynq，Xilinx zynqmp，NXP t2080的支持在下一步开发计划中，目前支持功能如下， zc@ubuntu:~/fdk_develope$ fdk -h Usage: fdk [OPTION...] Examples: fdk -t xilinx -p ~/hdf # Create workspace in current path. fdk -t xilinx -p ~/hdf -s ~/mwm # Create workspace in ~/mwm. fdk -c kernel menu # Open kernel menuconfig. fdk -c uboot menu # Open kernel menuconfig. fdk -b all # Build all component of project. fdk -b kernel # Build kernel of project. fdk -b uboot # Build uboot of project. fdk -d all # Clean all component of project. fdk -d kernel # Clean kernel of project. fdk -d uboot # Clean uboot of project. fdk -k boot mini # Packet BOOT.BIN for xilinx in [mini] mode. fdk -k boot normal -g ./mwm.bit # Packet BOOT.BIN for xilinx in [normal] mode. fdk -k rootfs # Packet rootfs. fdk -k fit # Packet FIT image. Main operation mode: -t <target>: project target[xilinx, nxp] -s <path>: workspace path -p <path>: hdf path, for target xilinx -u <component>: update component[fsbl, pmufw, dts] -c <component> <mode>: config component[uboot, kernel] with mode[init, menu] -b <component>: build component[all | fsbl, pmufw, atf, uboot, kernel, dtb, dts] misc[ubootenvtool] -d <component>: clean component[all | fsbl, pmufw, atf, uboot, kernel] bsp[bsp] -k <type> <mode>: packet image with type[boot, rootfs, fit] boot: packet bootloader for xilinx device with mode[mini, normal] mini: fsbl and uboot for zynq fsbl, pmufw, atf, uboot for zynqmp normal: mode[mini] + FPGA bitstream rootfs: packet rootfs with mode[all | cpio, ext4] fit: packet kernel, rootfs and dtb -g <path>: bit path, when packet boot image in normal mode -h: show this help Revision: fdk is a fast developing kit for embedded linux, target for xilinx[zynq/zynqmp], nxp[t2080] Time Author Revision 2018-09-17 Zhu Ce Initial release, support xilinx zynqmp with petalinux-v2017.4 2018-10-02 Zhu Ce Add support for xilinx zynq with petalinux-v2017.4