The EBAZ4205 was originally developed as cryptomining control board. Due to it's low price on the marked it is also perfect to learn the Zynq platform. This br2-external tree provides everything to build a linux system with basic BSP (Board Support Package).
Lukas Lichtl (admin@embed-me.com)
This layer depends on:
URI: git://git.busybox.net/buildroot
branch: 2020.11.x
make BR2_EXTERNAL=/path/to/ebaz4205_buildroot zynq_ebaz4205_defconfig
make 2>&1 | tee build.log
The following files from within the output/images/ need to be copied to a SD-Card with a FAT-formatted partition with boot flag set:
- boot.bin
- ebaz4205_top.bin (from the Vivado build)
- ebaz4205-zynq7.dtb
- rootfs.cpio.uboot
- u-boot.bin
- u-boot.img
- uEnv.txt
- uImage
Basic system initialization.
Tailored for SD-Boot, since this is how the board is mainly used. In this distribution, u-boot (instead of the FSBL) is responsible for configuring the Bitstream. Wait time during boot is set to zero. In order to interrupt the boot process, press and hold Button S2 during boot and you will end up in the u-boot console.
In order to identify boot issues, the following LED codes are.
| LED red | LED green | Boot State | Description |
|---|---|---|---|
| on | on | 0 | init/pwr up |
| on | off | 1 | Bitstream config done |
| off | on | 2 | DDR load done |
| off | off | 3 | - |
The systems default credentials are root / root.
As init system, busybox was chosen.
The phy on the board supports 10/100Mbit and the image makes use of Dropbears SSH-server. This allows you to connect to the board without the use of the serial console.
In order to identify that linux was booted as intended and the system is running, the green LED provides a heartbeat.
| LED red | LED green | Boot State | Description |
|---|---|---|---|
| off | heartbeat | 0 | init done |
The boot partition is mounted on /media/mmcblk0p1.
This allows access to the boot files while the system
is running (eg. to modify uEnv.txt or provide updates).
Button presses can be detected in user-space
using /dev/input/event0.
Both LEDs on the front (green, red) are accessable
from within user space /sys/class/leds.