kumquat-buildroot

NetCube-Systems-Austria/kumquat-buildroot

History

Davide Viti 03130f944a microzed: add Avnet Microzed support

Changes are based on Zedboard: Xilinx does not provide a specific DTS
for Microzed in the kernel tree. It is suggested [1] to use the
zynq-zed.dts and change the RAM size

[1] https://forums.xilinx.com/t5/Embedded-Linux/Microzed-default-device-tree-dts/td-p/432856

[Thomas:
 - extend readme.txt to indicate why the same DTB is used for Microzed
   and the Zedboard.
 - add a description + Signed-off-by line in the
   0001-zynq-Create-microzed-specific-U-Boot-environment.patch, by
   re-using the description of the same patch for the Zedboard.]

Signed-off-by: Davide Viti <d.viti@infosolution.it>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

2015-09-17 23:54:39 +02:00

uboot

readme.txt

This is the buildroot board support for the Avnet Microzed. The Microzed is
a development board based on the Xilinx Zynq-7000 based All-Programmable
System-On-Chip.

Microzed information including schematics, reference designs, and manuals are
available from http://www.zedboard.org .

Steps to create a working system for Microzed:

1) make microzed_defconfig
2) make
3) copy files BOOT.BIN, u-boot-dtb.img, rootfs.cpio.uboot,
	uImage, zynq-zed.dtb into your SD card
4) boot your Microzed

The expected output:

 U-Boot SPL 2015.07 (Sep 15 2015 - 16:10:56)
 mmc boot
 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


 U-Boot 2015.07 (Sep 15 2015 - 16:10:56 +0200)

 Model: Zynq MicroZED Board
 I2C:   ready
 DRAM:  ECC disabled 1 GiB
 MMC:   zynq_sdhci: 0
 Using default environment
 ...

When using an older U-Boot then 2015.07, a working ps7_init.c
file is required to be installed into the U-Boot directory
structure. From 2015.07, the major Zynq-based boards are
supported without any manual intervention.

Resulting system
----------------
A FAT32 partition should be created at the beginning of the SD Card
and the following files should be installed:
	/BOOT.BIN
	/zynq-zed.dtb
	/uImage
	/rootfs-cpio.uboot
	/u-boot-dtb.img

All needed files can be taken from output/images/

BOOT.BIN, uImage and u-boot-dtb.img are direct copies of the same files
available on output/images/.

Note th at the DTB (zynq-zed.dtb) is the same as the one used for the
Zedboard, and that this is the recommended solution, see
https://forums.xilinx.com/t5/Embedded-Linux/Microzed-default-device-tree-dts/td-p/432856.

There is a patch attached that redefines the U-Boot's environment
to work with Buildroot out-of-the-box.

You can alter the booting procedure by creating a file uEnv.txt
in the root of the SD card. It is a plain text file in format
<key>=<value> one per line:

kernel_image=myimage
modeboot=myboot
myboot=...