buildroot

Digilent Zybo

=============

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This is the Buildroot board support for the Digilent Zybo. The Zybo is

a development board based on the Xilinx Zynq-7000 based All-Programmable

System-On-Chip.

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Zybo information including schematics, reference designs, and manuals are

available from http://store.digilentinc.com/zybo-zynq-7000-arm-fpga-soc-trainer-board/ .

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If you want a custom FPGA bitstream to be loaded by U-Boot, copy it as

system.bit in board/digilent/zybo/.

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Steps to create a working system for Zybo:

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1) make zynq_zybo_defconfig

2) make

3) write your SD Card with the sdcard.img file using dd by doing

  $ sudo dd if=output/images/sdcard.img of=/dev/sdX

4) insert the SD Card and power up your Zybo

5) Expect serial console on the second USB serial port exposed by the board

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The expected output:

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 U-Boot SPL 2016.05 (May 20 2016 - 16:16:24)

 mmc boot

 Trying to boot from MMC1

 reading system.dtb

 spl_load_image_fat_os: error reading image system.dtb, err - -1

 reading u-boot-dtb.img

 reading u-boot-dtb.img

​

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 U-Boot 2016.05 (May 20 2016 - 16:16:24 +0200)

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 Model: Zynq ZYBO Development Board

 Board: Xilinx Zynq

 I2C:   ready

 DRAM:  ECC disabled 512 MiB

 MMC:   sdhci@e0100000: 0

 SF: Detected S25FL128S_64K with page size 256 Bytes, erase size 64 KiB, total 16 MiB

 In:    serial@e0001000

 Out:   serial@e0001000

 Err:   serial@e0001000

 Model: Zynq ZYBO Development Board

 Board: Xilinx Zynq

 Net:   ZYNQ GEM: e000b000, phyaddr 0, interface rgmii-id

 I2C EEPROM MAC address read failed

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 Warning: ethernet@e000b000 (eth0) using random MAC address - 56:64:dd:a7:6d:94

 eth0: ethernet@e000b000

 ...

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Resulting system

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Once the build process is finished you will have an image called "sdcard.img"

in the output/images/ directory.

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The first partition is a FAT32 partition created at the beginning of the SD Card

that contains the following files :

    /BOOT.BIN

    /zynq-zybo.dtb

    /uEnv.txt