This repo contains an example PetaLinux and Vivado project for the EBAZ4205 board. It has been created with Vivado 2020.1 and PetaLinux 2020.1.
I2C is routed to the unpopulated X3 header. You need to place resistors on the unpopulated footprints in order to use it. I put a 50mil header on the SO-8 footprint, YMMV.
The remaining signals are routed as follows:
| IO port pin | FPGA signal |
|---|---|
| LED1 | gpio_0_tri_io[1] |
| LED2 | gpio_0_tri_io[0] |
| DATA3_5 | SPI0_SS_O_0 |
| DATA3_6 | gpio_0_tri_io[7] |
| DATA3_7 | gpio_0_tri_io[6] |
| DATA3_8 | SPI0_MOSI_O_0 |
| DATA3_9 | SPI0_SCLK_O_0 |
| DATA3_11 | gpio_0_tri_io[5] |
| DATA3_14 | GPIO_0_0_tri_io[1] |
| DATA3_15 | GPIO_0_0_tri_io[0] |
| DATA3_16 | SPI1_SCLK |
| DATA3_17 | SPI1_SS |
| DATA3_18 | SPI1_MOSI |
| DATA3_19 | SPI1_MISO |
| DATA3_20 | GPIO_0_0_tri_io[4] |
| J5_PWM | GPIO_0_0_tri_io[2] |
| J5_SPEED | GPIO_0_0_tri_io[3] |
| DATA1_18 | SPI0_MOSI_O_1 |
| DATA1_19 | SPI0_SCLK_O_1 |
| DATA1_20 | SPI0_SS1_O_0 |
| J3_PWM | pwm_l_out |
| J3_SPEED | pwm_r_out |
SPI1 is implemented using an IP core. SPI0 is the PS SPI. MOSI and CLK of this SPI bus are duplicated. MISO is not routed out.
J3_PWM and J3_SPEED provide unfiltered PWM audio outputs.
In order to use these (and the userspace-controllable GPIOs on J5), you might want to mod the J3/J5 connectors, remove the opto couplers in order to use them as plain 3.3V GPIOs. Here's an idea how to do that:
I assume you have modded the board for SD boot (move resistor from R2584 to R2577).
In order to boot the PetaLinux system, copy the 3 files BOOT.BIN, boot.scr and image.ub from the images subdir onto a FAT32-formatted SD card.
Network configuration is set to DHCP, a serial console will be available on J7. Username/password is root/root. There is no persistent storage, the system runs from ramdisk. This means that a new SSH key is generated at every boot.
Analog Devices' Kuiper Linux is a modified Raspbian for use on Zynq-7000 boards (among others). I recommend to use that as a basis. To support the EBAZ4205, you need to modify boot partition and rootfs. Put the BOOT.BIN from images and boot.scr and uImage from images/raspbian on the FAT32 boot partition.
The kernel modules matching the PetaLinux kernel in the uImage need to copied to the rootfs manually: For your convenience, you can find the PetaLinux rootfs in a cpio.gz in images/raspbian. Open it with Midnight Commander and copy over the kernel modules manually into Raspbian's rootfs.
If you plan to compile the kernel yourself, beware that the correct uImage to use is the one the symlink build/tmp/deploy/images/zynq-generic/uImage points to. The one in images/linux/ contains the rootfs as ramdisk and does not mount the Raspbian rootfs on the SD card.