linux-vitis-buildroot-zynq

The repository describes how to build linux (system software) for Zynq 7000 and Zynqmp from sources by using Xilinx Vitis 2022.1 and Buildroot All information is available on Xilinx Confluence Xilinx Open Source Linux. The system software was build by using Windows 10 with Vitis 2022.2 installed and Ubuntu 18.04 running on VMware Workstation virtual machine The dependencies for Ubuntu 18.04

sudo apt install sed make binutils build-essential diffutils gcc g++ bash patch gzip bzip2 perl tar cpio unzip rsync file bc findutils wget subversion

Repo structure

+-- boot/ # used for keeping compiled images
|
+-- devicetree-src/     # for device tree sources
|   |
|   +-- zynq/
|   +-- zynqmp/
|
+-- external-tree/  # buildroot project
|   |
|   +-- boards/
|   +-- configs/
|
+-- u-boot-xlnx-src/    # for u-boot sources
|   |
|   +-- arch/
|   +-- configs/
|   +-- include/
|
+-- user-space-app/     # user space application
    |
    +-- dma/    # axidma
    +-- gpio-arty/  # gpio leds and pb from user space
    +-- gpio-arty-py/ # gpio leds and pb from user space for python

Deliviring system software step-by-step

1. Building a project in Vivado 2022.2 and exporting .xsa file to Vitis 2022.2 envoriment
2. Customizing and building devicetree, FSBL, PMU (for zynqmp)
3. Customizing and building u-boot
4. Customizing and building a buildroot project
5. Preparing and loading Image to the target

Build ARM trusted firmware for zynqmp

Note: Please see Xilinx Wiki about building arm-trusted-firmware

load and extract an archive with x86_64 Linux hosted cross compiler AArch64 ELF bare-metal target aarch64-none-elf

ls -l
total 28
-rw-r--r-- 1 aleksei aleksei 3797 Jul 13  2021 10.3-2021.07-x86_64-aarch64-none-elf-manifest.txt
drwxr-xr-x 5 aleksei aleksei 4096 Jul  1  2021 aarch64-none-elf
drwxr-xr-x 2 aleksei aleksei 4096 Jul  1  2021 bin
drwxr-xr-x 3 aleksei aleksei 4096 Jul  1  2021 include
drwxr-xr-x 4 aleksei aleksei 4096 Jul  1  2021 lib
drwxr-xr-x 3 aleksei aleksei 4096 Jul  1  2021 libexec
drwxr-xr-x 7 aleksei aleksei 4096 Jul  1  2021 share

cd bin/
export PATH=`pwd`:$PATH
source ~/.bashrc
cd ../..
git clone https://github.com/Xilinx/arm-trusted-firmware.git
cd arm-trusted-firmware
make CROSS_COMPILE=aarch64-none-elf- PLAT=zynqmp RESET_TO_BL31=1

copy /arm-trusted-firmware/build/zynqmp/release/bl31/bl31.elf to boot/

Preparing and loading Image to the target

Linux Image for zynq / zynqmp is presented by BOOT.BIN (fsbl.elf, pmufw.elf (for zynqmp), bl31.elf (for zynqmp), u-boot.elf, system.bit) and image.itb (rootfs.cpio, devicetree.dtb, Linux_kernel)

For generating BOOT.BIN Vitis 2022.1 is used (In created Platform Project Xilinx - Create Boot Image - Zynq and Zynq Ultrascle - Browse output.bif file)

output.bif is situated in boot/ folder

Created BOOT.BIN file should be writing into flash memory

booting and running image.itb on targets via TFTP

For TFTP server Windows TFTP Utility is used.

IP address 192.168.0.21 for tftp server are pointed in u-boot settings (.h configuration file) and should be set on the local machine for IP4V

#define CONFIG_SERVERIP     192.168.0.21
#define CONFIG_GATEWAYIP    192.168.0.1
#define CONFIG_NETMASK      255.255.255.0

Commands for loading and running image.itb in u-boot console:

Zynq 7000:

tftpb 0x4000000 image-arty.itb
bootm 0x4000000

Zynqmp:

tftpb 0x60000000 image-trenz.itb
bootm 0x60000000

Last command will load and run Linux on the target

Writing BOOT.BIN into flash from u-boot (BOOT.BIN is less than 8 Mb)

Zynq 7000:

tftpb 0x4000000 BOOT.BIN
sf probe 0 0 0
sf erase 0 0x1000000
sf write 0x4000000 0 0x800000

Zynqmp:

tftpb 0x60000000 BOOT.BIN
sf probe 0 0 0
sf erase 0 0x800000
sf write 0x60000000 0 0x800000