Poky manual

Use cases

Linux kernel update when adding/developing a driver
When an application needs to be included into the firmware image archive
Update Elphel's PHP extension
C/C++ applications if developed on PC require a cross-compiler and require Yocto installation or some other alternative.

Other projects that use Python, PHP, Javascript, HTML, C/C++ on hardware (compiler is included in the firmware image) do not require this SDK use but it makes the process more convenient, e.g. by copying the built packages straight to the target hardware.

Description

Building embedded Linux image for Zynq ARMv7 platform - Elphel 10393 board
Yocto Poky revision = 2.6 (Thud)
~~Yocto Poky revision = 2.4 (Rocko)~~
~~Yocto Poky revision = 2.0 (Jethro)~~

Features

Environment is set up with a single script
All Elphel projects are configured for Eclipse IDE:
- fpga projects (verilog)
- kernel
- applications projects
All steps for fpga projects are run from Eclipse IDE
- Read about setting up Eclipse based FPGA development
- VDT Plugin repository

Once everything is built it supports updating software projects (files and binaries) on the target system
- access is set up in yocto's local.conf (see setup.py output) + ssh-copy-id
- bitbake some-app -c target_scp from the command line or Eclipse IDE - see examples in elphel-apps-... at Git

Requirements

Kubuntu 18.04 x64 (as of Dec 2018)
For Poky 2.6 Thud see Yocto Project Poky 2.6 mega-manual

Output files

The names are listed as they appear in the u-boot configuration header file - actual output files have different names:

File(s)	Description
boot.bin	u-boot as the first stage bootloader = Secondary Program Loader (SPL) that boots u-boot-dtb.img
u-boot-dtb.img	full size u-boot with a stripped device tree (cat u-boot.img some_stripped_devicetree.dtb > u-boot-dtb.img)
devicetree.dtb	device tree with listed interfaces, zynq registers, interrupts and drivers elphel393/bootable-images/mmc/devicetree.dtb - mount rootfs from mmc partition elphel393/bootable-images/nand/devicetree.dtb - mount rootfs from NAND flash
uImage	kernel, drivers
rootfs.ubifs, rootfs.ubi, rootfs.tar.gz	rootfs in different formats - .ubi for NAND, *.tar.gz for mmc

The file are located at elphel393/bootable-images/, which is a link to poky's deploy directory elphel393/poky/build/tmp/deploy/images/elphel393/

complete set of files for rootfs in NAND Flash: elphel393/bootable-images/nand/
complete set of files for rootfs on MMC (micro SD card): elphel393/bootable-images/mmc/

Write files to media and boot

Boot from micro SD card

Use recovery or regular μSD card
EXT4 partition mounted as /

Detailed instructions

Boot from NAND flash

The default boot option - power on.
A UBIFS image is written to /dev/mtd4 - is mounted as /

Detailed instructions

Notes

Read more about boot options.

Setup

Poky 2.6 Thud (Kubuntu 18.04)

git clone -b thud https://git.elphel.com/Elphel/elphel393.git
cd elphel393
./setup.py
cd poky
. ./oe-init-build-env
bitbake u-boot device-tree linux-xlnx core-image-elphel393

Poky 2.4 Rocko

git clone -b rocko https://git.elphel.com/Elphel/elphel393.git
cd elphel393
./setup.py
cd poky
. ./oe-init-build-env
bitbake u-boot device-tree linux-xlnx core-image-elphel393

Poky 2.0 Jethro

git clone -b jethro https://git.elphel.com/Elphel/elphel393.git # or git clone git@git.elphel.com:Elphel/elphel393.git # if ssh public key is uploaded
# then follow the same steps as for Rocko

Notes:

The last line builds all targets.
If python-numpy was not installed

x393.h will not be generated > bitbake linux-xnlx will fail.
To recover:
1. sudo apt install python-numpy
2. run bitbake linux-xlnx -c link -f

if rerun setup.py updates all repositories and reruns other procedures.

$ ./setup.py
if you notice the kernel got updated then you might need to restart with bitbake linux-xlnx -c link -f

Compare built vs deployed software versions

cd elphel393
./check_versions.py root@192.168.0.9

Notes:

deployed = running on the target system

check_versions.py output in terminal

Build

All targets

bitbake u-boot device-tree linux-xlnx core-image-elphel393

Bootloader

bitbake u-boot

Output

boot.bin
u-boot-dtb.img

Notes

Since Poky 1.5.1: switched from u-boot-xlnx to u-boot - some of the u-boot-xlnx reached the upstream
Since Poky 1.5.1: u-boot introduced Kconfig and currently (as of 2016/01/22) is still migrating from autoconf - keeping both build methods working together.
Current u-boot uses the board's device tree blob to make a stripped version for itself - uncompiled device tree files are present in the u-boot sources

Device tree

bitbake device-tree

Output

devicetree.dtb

Kernel

bitbake linux-xlnx

Output

uImage

Notes

yocto jethro: Kernel version is 4.0, linux-xlnx
yocto rocko: Kernel version is 4.9.0, linux-xlnx
Device Tree Blob is compiled separately in linux-xlnx
Uncompiled device tree files are present in the linux sources provided by linux-xlnx

Rootfs

bitbake core-image-elphel393

Output

rootfs.tar.gz
rootfs.ubi,rootfs.ubifs

Details for development

Development for 10393

Notes

[FIXED] lighttpd-1.4.39, mod-cgi

compile warning:

implicit declaration of function 'chunkqueue_written'

results in lighttpd failing to start if mod-cgi is enabled:

Starting Lighttpd Web Server: 2016-01-26 18:42:17: (/data/GIT_fresh/poky/build/tmp/work/cortexa9-vfp-neon-poky-linux-gnueabi/lighttpd/1.4.36-r0/lighttpd-1.4.36/src/plugin.c.169) dlopen() failed for: /usr/lib/mod_cgi.so /usr/lib/mod_cgi.so: undefined symbol: chunkqueue_w 
2016-01-26 18:42:17: (/data/GIT_fresh/poky/build/tmp/work/cortexa9-vfp-neon-poky-linux-gnueabi/lighttpd/1.4.36-r0/lighttpd-1.4.36/src/server.c.679) loading plugins finally failed 
lighttpd.

Note: why 1.4.36?!!

solution: exclude the 0001-mod_cgi-buffers-data-without-bound.patch from the file list that comes with the poky/meta/recipes-extended/lighttpd_1.4.39.bb

Invalidate chache/checksum on package code changes
- SRCREV = "${AUTOREV}" - updates the checksum but the cache is not cleared/invalidated?

SRCREV <- AUTOREV <- AUTOREV <- "${@bb.fetch2.get_autorev(d)}" (bitbake/lib/bb/__init__.py)

def get_autorev(d):
   #  only not cache src rev in autorev case
   if d.getVar('BB_SRCREV_POLICY', True) != "cache":
       d.setVar('__BB_DONT_CACHE', '1')
   return "AUTOINC"

BB_DONT_CACHE ?!!!!!!!

Force to always execute recipe starting from a certain task:

recipe-outside-of-task: do_compile[nostamp]="1"
or
recipe-class-inside-task: d.setVarFlag('do_compile', 'nostamp', '1')

clone git repo over https in a recipe

SRC_URI = "git://git.elphel.com/project.git;protocol=https;branch=master"

Errors

Aborted, core dumped
- Got when tried to build gstreamer1.0-plugins-base - error in one of the packages it depends on.
- Possible reason - Kubuntu 14.04 - the system libraries are too old? The up-to-date Kubuntu release is 16.04.
- Command (example):

bitbake libxau-native

- log:

| x86_64-linux-libtool: link: ar cru .libs/libXau.a  AuDispose.o AuFileName.o AuGetAddr.o AuGetBest.o AuLock.o AuRead.o AuUnlock.o AuWrite.o
| *** buffer overflow detected ***: ar terminated
| ======= Backtrace: =========
| /lib/x86_64-linux-gnu/libc.so.6(+0x7329f)[0x2b732eade29f]
| /lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x2b732eb75bbc]
| /lib/x86_64-linux-gnu/libc.so.6(+0x109a90)[0x2b732eb74a90]
| /lib/x86_64-linux-gnu/libc.so.6(+0x108f99)[0x2b732eb73f99]
| /lib/x86_64-linux-gnu/libc.so.6(_IO_default_xsputn+0xbc)[0x2b732eae660c]
| /lib/x86_64-linux-gnu/libc.so.6(_IO_padn+0xa0)[0x2b732eada600]
| /lib/x86_64-linux-gnu/libc.so.6(_IO_vfprintf+0x3c4d)[0x2b732eab888d]
| /lib/x86_64-linux-gnu/libc.so.6(__vsprintf_chk+0x84)[0x2b732eb74024]
| /lib/x86_64-linux-gnu/libc.so.6(__sprintf_chk+0x7d)[0x2b732eb73f7d]
| ar[0x406d20]
| ar[0x4088df]
| ar[0x40bf08]
| ar[0x404a86]
| ar[0x405003]
| ar[0x402a45]
| /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5)[0x2b732ea8cf45]
| ar[0x402dc5]
| ======= Memory map: ========
| 00400000-00482000 r-xp 00000000 08:01 27273645                           /usr/local/bin/ar
| 00682000-00683000 r--p 00082000 08:01 27273645                           /usr/local/bin/ar
| 00683000-00684000 rw-p 00083000 08:01 27273645                           /usr/local/bin/ar
| 00776000-007e0000 rw-p 00000000 00:00 0                                  [heap]
| 2b732e846000-2b732e869000 r-xp 00000000 08:01 26740221                   /lib/x86_64-linux-gnu/ld-2.19.so
| 2b732e869000-2b732e86d000 rw-p 00000000 00:00 0
| 2b732e898000-2b732e89b000 rw-p 00000000 00:00 0
| 2b732ea68000-2b732ea69000 r--p 00022000 08:01 26740221                   /lib/x86_64-linux-gnu/ld-2.19.so
| 2b732ea69000-2b732ea6a000 rw-p 00023000 08:01 26740221                   /lib/x86_64-linux-gnu/ld-2.19.so
| 2b732ea6a000-2b732ea6b000 rw-p 00000000 00:00 0
| 2b732ea6b000-2b732ec25000 r-xp 00000000 08:01 26740235                   /lib/x86_64-linux-gnu/libc-2.19.so
| 2b732ec25000-2b732ee25000 ---p 001ba000 08:01 26740235                   /lib/x86_64-linux-gnu/libc-2.19.so
| 2b732ee25000-2b732ee29000 r--p 001ba000 08:01 26740235                   /lib/x86_64-linux-gnu/libc-2.19.so
| 2b732ee29000-2b732ee2b000 rw-p 001be000 08:01 26740235                   /lib/x86_64-linux-gnu/libc-2.19.so
| 2b732ee2b000-2b732ee30000 rw-p 00000000 00:00 0
| 2b732ee30000-2b732ee46000 r-xp 00000000 08:01 26741717                   /lib/x86_64-linux-gnu/libgcc_s.so.1
| 2b732ee46000-2b732f045000 ---p 00016000 08:01 26741717                   /lib/x86_64-linux-gnu/libgcc_s.so.1
| 2b732f045000-2b732f046000 rw-p 00015000 08:01 26741717                   /lib/x86_64-linux-gnu/libgcc_s.so.1
| 7fffb978b000-7fffb97ad000 rw-p 00000000 00:00 0                          [stack]
| 7fffb97f8000-7fffb97fa000 r-xp 00000000 00:00 0                          [vdso]
| ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
| ./x86_64-linux-libtool: line 1723:  8035 Aborted                 (core dumped) ar cru .libs/libXau.a AuDispose.o AuFileName.o AuGetAddr.o AuGetBest.o AuLock.o AuRead.o AuUnlock.o AuWrite.o
| make[2]: *** [libXau.la] Error 134
| make[2]: Leaving directory `/GIT/elphel393/poky/build/tmp/work/x86_64-linux/libxau-native/1_1.0.8-r0/build'
| make[1]: *** [all-recursive] Error 1
| make[1]: Leaving directory `/GIT/elphel393/poky/build/tmp/work/x86_64-linux/libxau-native/1_1.0.8-r0/build'
| make: *** [all] Error 2
| ERROR: oe_runmake failed

Poky manual

Contents

Use cases

Description

Features

Requirements

Output files

Write files to media and boot

Boot from micro SD card

Boot from NAND flash

Notes

Setup

Compare built vs deployed software versions

Build

All targets

Bootloader

Output

Notes

Device tree

Output

Kernel

Output

Notes

Rootfs

Output

Details for development

Notes

Errors

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