Building an FSBL for the ZC706 using Petalinux

Well, another blog post on how to build a modified FSBL for ZYNQ. Using the patch which I demonstrated how to make in the previous post and a modified version of the fsbl_%.bbappend file which I received from the Xilinx Forum post regarding this I was able to make a working FSBL with my patch. The modified fsbl_%.bbappend file is shown below.

# Force to use embeddedsw repository
EXTERNALXSCTsrc=""
EXTERNALXSCTSRC_BUILD = ""

#Enable FSBL debug flags
YAML_COMPILER_FLAGS_append = " -DFSBL_DEBUG"

# Patch FSBL
SRC_URI_append += "file://0001-fsbl.patch"
FILESEXTRAPATHS_prepend := "${THISDIR}/files:"

Here are the steps used to create the FSBL

First run petalinux-create to build a petalinux project. Point it at the appropriate BSP.

$ petalinux-create --type project --source /tools/xilinx/bsp/xilinx-zc706-v2017.4-final.bsp

Then copy the fsbl_%.bbappend file into the project.

$ cp fsbl_%.bbappend xilinx-zc706-2017.4/project-spec/meta-user/recipes-bsp/fsbl
$ cp 0001-fsbl.patch xilinx-zc706-2017.4/project-spec/meta-user/recipes-bsp/fsbl/files

Next run a petalinux-build to make the bootloader

$ petalinux-build --project xilinx-zc706-2017.4 -c bootloader

When all is said and done you will get a zynq_fsbl file in xilinx-zc706-2017.4/images/linux/zynq_fsbl.elf.

This procedure works for 2017.4 and 2016.4.

Building from the git checkout

Alternatively you can build from the git checkout where you made the patch. This seems much simpler but it doesn’t work for me with petalinux 2016.4.

From the embeddesw checkout directory cd to lib/sw_apps/zynq_fsbl_src and run the following command.

$ make BOARD=zc706

This should build the file fsbl.elf in the src directory.

When I try to build this for 2016.4 I get a bunch of errors. They differ depending on how I set the CC variable on the make command line. If I don’t set it I get errors about arm-xilinx-eabi-gcc: Command not found. If I set CC=arm-none-eabi-gcc then I get this

arm-none-eabi-gcc    -c pcap.c -o pcap.o -I../misc//ps7_cortexa9_0/include -I.
In file included from pcap.c:96:0:
pcap.h:65:21: fatal error: xdevcfg.h: No such file or directory
compilation terminated.
Makefile:97: recipe for target 'pcap.o' failed

If anyone knows what to do about this I’m all ears.