microzed: add Avnet Microzed support

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=...

From a4c0058967a551385da5e16d2787d9f704cab225 Mon Sep 17 00:00:00 2001

From: Jan Viktorin <viktorin@rehivetech.com>

Date: Thu, 18 Jun 2015 16:26:02 +0200

Subject: [PATCH] zynq: Create microzed-specific U-Boot environment

This is a copy of the patch supplied for Zedboard.

Signed-off-by: Davide Viti <d.viti@infosolution.it>

--- a/include/configs/zynq_microzed.h	2015-07-14 19:32:21.000000000 +0200

+++ b/include/configs/zynq_microzed.h	2015-09-02 12:19:35.728503472 +0200

@@ -22,4 +22,29 @@

 #include <configs/zynq-common.h>

+#undef CONFIG_EXTRA_ENV_SETTINGS

+#define CONFIG_EXTRA_ENV_SETTINGS \

+	"envload=mmc info && if fatload mmc 0 0x1000 uEnv.txt;"\

+	" then echo Importing uEnv.txt; env import -t 0x1000"  \

+	" $filesize; fi;\0"                                    \

+	"bootcmd=run $modeboot\0"                              \

+	"modeboot=sdboot\0"                                    \

+	"baudrate=115200\0"                                    \

+	"bootenv=uEnv.txt\0"                                   \

+	"devicetree_image=zynq-zed.dtb\0"                      \

+	"kernel_image=uImage\0"                                \

+	"ramdisk_image=rootfs.cpio.uboot\0"                    \

+	"fpga_image=system.bit\0"                              \

+	"sdboot=echo Booting from SD...;"                      \

+	" run envload; run fpgaboot;"                          \

+	" fatload mmc 0 0x1000000 ${kernel_image}"             \

+	" && fatload mmc 0 0x2000000 ${ramdisk_image}"         \

+	" && fatload mmc 0 0x3000000 ${devicetree_image}"      \

+	" && bootm 0x1000000 0x2000000 0x3000000\0"            \

+	"fpgaboot=if fatload mmc 0 0x1000000 ${fpga_image};"   \

+	" then echo Booting FPGA from ${fpga_image};"          \

+	" fpga info 0 && fpga loadb 0 0x1000000 $filesize;"    \

+	" else echo FPGA image ${fpga_image} was not found,"   \

+	" skipping...; fi;\0"

+

 #endif /* __CONFIG_ZYNQ_MICROZED_H */

BR2_arm=y

BR2_cortex_a9=y

BR2_ARM_ENABLE_NEON=y

BR2_KERNEL_HEADERS_VERSION=y

BR2_DEFAULT_KERNEL_VERSION="3.8"

BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_8=y

BR2_TARGET_GENERIC_GETTY_PORT="ttyPS0"

BR2_LINUX_KERNEL=y

BR2_LINUX_KERNEL_CUSTOM_GIT=y

BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git://github.com/Xilinx/linux-xlnx.git"

BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="xilinx-v2015.1"

BR2_LINUX_KERNEL_DEFCONFIG="xilinx_zynq"

BR2_LINUX_KERNEL_UIMAGE_LOADADDR="0x8000"

BR2_LINUX_KERNEL_DTS_SUPPORT=y

BR2_LINUX_KERNEL_INTREE_DTS_NAME="zynq-zed"

BR2_TARGET_ROOTFS_CPIO=y

BR2_TARGET_ROOTFS_CPIO_GZIP=y

BR2_TARGET_ROOTFS_CPIO_UIMAGE=y

BR2_TARGET_UBOOT=y

BR2_TARGET_UBOOT_BOARDNAME="zynq_microzed"

BR2_TARGET_UBOOT_CUSTOM_VERSION=y

BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2015.07"

BR2_TARGET_UBOOT_PATCH="$(TOPDIR)/board/avnet/microzed/uboot"

BR2_TARGET_UBOOT_FORMAT_DTB_IMG=y

BR2_TARGET_UBOOT_SPL=y

BR2_TARGET_UBOOT_ZYNQ_IMAGE=y