..

PetaLinux 2022.1 Example / BRAM build

Create Project

source <path-to-installed-Petalinux>/settings.sh
petalinux-create -t project --template zynqMP -n <projname>
cd <projname>

Setup Config

petalinux-config --get-hw-description=<.xsa-path>

Yocto settings

YOCTO_MACHINE_NAME -> xilinx-zcu102.conf

DTG Settings

MACHINE_NAME -> zcu102-rev1.0

Adding a Custom Application

petalinux-create -t apps --template c --name <appname> --enable
  • add files
  • edit makefile
  • edit .bb
petalinux-build -c <appname>

Kernel Configuration

petalinux-config -c kernel

Kernel Hacking

[ ] Filter access to /dev/mem

Device Drivers

[*] Userspace I/O drivers
	---> [*] Userspace I/O platform driver with generic IRQ handling
	---> [*] Userspace I/O platform driver with generic IRQ handling and dynamic memory

RFS Configuration

petalinux-config -c rootfs
Apps
	---> [*] <your app>
Image Features
	---> [*] auto-login
  • issue when running under the “petalinux” user account where access to /dev/mem/ is blocked
    • enabling auto-login (root) fixed but is an “unsecure” solution
    • not for production + idc

Device Tree and U-Boot Modification

petalinux-build -c device-tree

Memory Mapping

cd project-spec/meta-user/recipes-bsp/device-tree/files
<edit> system-user.dtsi

/include/ "system-conf.dtsi"
/ {
   #address-cells = <2>;
   #size-cells = <2>;
   memory {
       device_type = "memory";
       reg = <0x0 0x0 0x0 0x80000000>, <0x0 0xa0000000 0x0 0x100000>, <0x00000008 0x00000000 0x0 0x80000000>;
   };
   reserved-memory {
       ranges;
       reserved {
           reg = <0x0 0xa0000000 0x0 0x100000>;
       };
   };
};

&axi_bram_ctrl_0 {
    status = "disabled";
};
  • Regs are set for 1MB of BRAM starting at 0xA0000000 (based on Vivado/FPGA design)

U-boot Config

cd project-spec/meta-user/recipes-bsp/u-boot/files
micro platform-top.h

#define CONFIG_NR_DRAM_BANKS 3

Build

petalinux-build

Package and Boot

cd images/linux
petalinux-package --boot --format BIN --fsbl zynqmp_fsbl.elf --u-boot --fpga --force
  • bitstream not automatically included in 2022.1 PL
    • add –fpga flag if using custom block design
  • copy the BOOT.bin, boot.scr, and image.ub into the SD card

References