Difference between revisions of "Poky manual"

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 +
==<font color="blue">Description</font>==
 +
Build the firmware for Elphel 10393 series camera systems from scratch.
 +
 +
Prebuilt releases can be found [https://community.elphel.com/files/393/ here].
 +
 +
==<font color="blue">Use cases</font>==
 +
* Update Linux Kernel when developing a driver
 +
* Include application to the default firmware package
 +
* 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 written in Python, PHP, Javascript, HTML, C/C++ (gcc is installed on the system board) can be developed on the camera. Installing the framework is not required but it can simplify the development process.
 +
 
==<font color="blue">Description</font>==
 
==<font color="blue">Description</font>==
  
 
* Building embedded Linux image for Zynq ARMv7 platform - Elphel 10393 board
 
* Building embedded Linux image for Zynq ARMv7 platform - Elphel 10393 board
* Yocto Poky revision = 2.0 (Jethro)
+
* Yocto Poky revision = 2.7.1 (Warrior) - <font color="green">builds in Kubuntu 20.04.</font> <font color="red">Older OSes are not supported. Roll back to get built in 16.04.</font>
 +
* <s>Yocto Poky revision = 2.4 (Rocko) - <font color="green">builds in Kubuntu 16.04.</font> <font color="red">Won't build in 18.04 or 20.04.</font></s>
 +
* <s>Yocto Poky revision = 2.0 (Jethro)</s>
  
 
==<font color="blue">Features</font>==
 
==<font color="blue">Features</font>==
Line 18: Line 33:
 
** ''bitbake some-app -c target_scp'' from the command line or Eclipse IDE - see examples in '''elphel-apps-...''' at [https://git.elphel.com/Elphel Git]
 
** ''bitbake some-app -c target_scp'' from the command line or Eclipse IDE - see examples in '''elphel-apps-...''' at [https://git.elphel.com/Elphel Git]
  
==<font color="blue">Supported OSes</font>==
+
==<font color="blue">Requirements</font>==
 +
* Kubuntu 20.04 x64
 +
* <s>Kubuntu 18.04 x64 (as of Dec 2018) - Poky: 2.7.1 Warrior (not tested but might build w/o problems)</s>
 +
* <s>Kubuntu 16.04 x64 (as of Dec 2018) - Poky: 2.4 Rocko, 2.7.1 Warrior</s>
  
* Kubuntu 14.04.3 LTS x64 (until June 2016)
 
* Kubuntu 16.04 x64 (as of June 2016)
 
 
==<font color="blue">Required packages</font>==
 
* Found in [http://www.yoctoproject.org/docs/2.0/mega-manual/mega-manual.html Yocto Project mega-manual] :
 
<font size='2'>
 
Ubuntu and Debian
 
sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib \
 
build-essential chrpath socat libsdl1.2-dev xterm device-tree-compiler
 
 
Fedora
 
sudo dnf install gawk make wget tar bzip2 gzip python unzip perl patch \
 
diffutils diffstat git cpp gcc gcc-c++ glibc-devel texinfo chrpath \
 
ccache perl-Data-Dumper perl-Text-ParseWords perl-Thread-Queue socat \
 
findutils which SDL-devel xterm device-tree-compiler
 
 
OpenSUSE
 
sudo zypper install python gcc gcc-c++ git chrpath make wget python-xml \
 
diffstat makeinfo python-curses patch socat libSDL-devel xterm device-tree-compiler                     
 
 
CentOS
 
sudo yum install gawk make wget tar bzip2 gzip python unzip perl patch \
 
diffutils diffstat git cpp gcc gcc-c++ glibc-devel texinfo chrpath socat \
 
perl-Data-Dumper perl-Text-ParseWords perl-Thread-Queue SDL-devel xterm device-tree-compiler
 
</font>
 
 
==<font color="blue">Other dependencies</font>==
 
<font size='2'>
 
sudo apt-get install python-numpy
 
</font>
 
 
==<font color="blue">Output files</font>==
 
==<font color="blue">Output files</font>==
 
The names are listed as they appear in the u-boot configuration header file - actual output files have different names:
 
The names are listed as they appear in the u-boot configuration header file - actual output files have different names:
* '''boot.bin''' - u-boot as the first stage bootloader = Secondary Program Loader that boots '''u-boot-dtb.img'''
+
{| class="wikitable"
* '''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.
+
! File(s)
** ''elphel393/bootable-images/mmc/devicetree.dtb'' - mount rootfs from mmc partition
+
! Build Command
** ''elphel393/bootable-images/nand/devicetree.dtb'' - mount rootfs from NAND flash
+
! Description
* '''uImage''' - kernel, drivers
+
|-
* '''rootfs.ubifs''', '''rootfs.ubi''', '''rootfs.tar.gz''' - rootfs in different formats
+
| <font color='darkblue'>'''boot.bin'''</font>
 +
| ''bitbake u-boot''
 +
| u-boot as the first stage bootloader = Secondary Program Loader (SPL) that boots '''u-boot-dtb.img'''
 +
|-
 +
| <font color='darkblue'>'''u-boot-dtb.img'''</font>
 +
| ''bitbake u-boot''
 +
| full size u-boot with a stripped device tree (''cat u-boot.img some_stripped_devicetree.dtb > u-boot-dtb.img'')
 +
|-
 +
|valign='top'| <font color='darkblue'>'''devicetree.dtb'''</font>
 +
| bitbake device-tree
 +
| 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
 +
|-
 +
| <font color='darkblue'>'''uImage'''</font>
 +
| ''bitbake linux-xlnx''
 +
| kernel, drivers
 +
|-
 +
| <font color='darkblue'>'''rootfs.ubifs''', '''rootfs.ubi''', '''rootfs.tar.gz'''</font>
 +
| ''bitbake core-image-elphel393''
 +
| rootfs in different formats - *.ubi* for NAND, *.tar.gz for mmc
 +
|}
  
They are found at '''elphel393/bootable-images/''', which is a link (for convenience) to poky's deploy directory '''elphel393/poky/build/tmp/deploy/images/elphel393/'''
+
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 in NAND Flash: ''elphel393/bootable-images/nand/''
Line 80: Line 89:
  
 
==<font color="blue">Setup</font>==
 
==<font color="blue">Setup</font>==
 +
* Before building
 +
Installing some dependencies:
 +
sudo apt install git build-essential chrpath diffstat gawk texinfo zlib1g-dev python3-numpy libssl-dev
 +
Installing old python2.7 (bitbake snapshot that we used has problem with python3.8):
 +
sudo apt install python2.7
 +
sudo ln -s python2.7 python2
 +
sudo ln -s python2.7 python
 +
 +
* Poky 2.7.1 Warrior (Kubuntu 20.04)
 
<font size='2'>
 
<font size='2'>
  git clone https://git.elphel.com/Elphel/elphel393.git
+
  git clone -b '''warrior''' https://git.elphel.com/Elphel/elphel393.git
 +
 
 +
If you are a developer and plan to commit changes you should use ssh access instead: git clone -b warrior git@git.elphel.com:Elphel/elphel393.git
 +
 +
 
 
  cd elphel393
 
  cd elphel393
 
  ./setup.py
 
  ./setup.py
Line 89: Line 111:
 
</font>
 
</font>
  
'''Notes:'''
+
* <s>Poky 2.4 Rocko (Kubuntu 16.04)
* 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'''
 
 
 
==<font color="blue">Compare '''built''' vs '''deployed''' software versions</font>==
 
 
<font size='2'>
 
<font size='2'>
 +
git clone -b '''rocko''' https://git.elphel.com/Elphel/elphel393.git
 
  cd elphel393
 
  cd elphel393
  ./check_versions.py root@192.168.0.9
+
  ./setup.py
</font>
+
cd poky
 +
. ./oe-init-build-env
 +
bitbake u-boot device-tree linux-xlnx core-image-elphel393
 +
<!--''Temporary: linux-xlnx in Rocko depends on branch 'lwir' for x393. Change in projects.json line 42 from 'master' to 'lwir'.''-->
 +
</font></s>
  
'''Notes:'''
+
* Notes (required actions are already listed above): When trying to run bitbake on a new install got problems with older bitbake version (current build uses specific snapshot) and python3.8. So I install old python2.7 and linked it:
* '''deployed''' = running on the target system
+
sudo apt install python2.7 python-numpy
 +
sudo ln -s python2.7 python2
 +
sudo ln -s python2.7 python
  
{|
+
After this bitbake just complained about missing tools (git, build-essential were already installed):
|[[File:Check versions.png|thumb|400px|check_versions.py output in terminal]]
 
|}
 
  
==<font color="blue">Build</font>==
+
sudo apt install chrpath diffstat gawk makeinfo
  
===<font color="blue">All targets</font>===
+
Program test_mcntrl.py that builds x393.h header files from FPGA code that runs during ./setup.py requires numpy and results in error output if missing Still setup.py continues, you need to look through its output few lines after
  bitbake u-boot device-tree linux-xlnx core-image-elphel393
+
  * x393
 +
git host: git.elphel.com
 +
Clone and checkout: x393
  
===<font color="blue">Bootloader</font>===
+
You may install numpy with
<font size='2'>
+
  sudo apt install python3-numpy
  bitbake u-boot
 
</font>
 
====Output====
 
* '''boot.bin'''
 
* '''u-boot-dtb.img'''
 
  
====Notes====
+
If you did not notice missing numpy, then during bitbake you will get error "build No rule to make target 'drivers/elphel/x393.o', needed by 'drivers/elphel/built-in.a'. Stop." in that case you need to install numpy, re-run setup.py (make sure numpy error is gone) then re-create linux kernel links during next build by erasing old ones:
* Since Poky 1.5.1: switched from u-boot-xlnx to u-boot - some of the u-boot-xlnx reached the upstream
+
bitbake linux-xlnx -c clean
* 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.
+
and re-running
* 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
+
bitbake linux-xlnx device-tree core-image-elphel393
  
===<font color="blue">Device tree</font>===
+
When building php: configure: error: zip support requires ZLIB. Use --with-zlib-dir=<DIR> to specify prefix where ZLIB include and library are located
<font size='2'>
+
  sudo apt install zlib1g-dev
  bitbake device-tree
 
</font>
 
====Output====
 
* '''devicetree.dtb'''
 
  
===<font color="blue">Kernel</font>===
+
==<font color="blue">Compare '''built''' vs '''deployed''' software versions</font>==
 
<font size='2'>
 
<font size='2'>
  bitbake linux-xlnx
+
  cd elphel393
 +
./check_versions.py root@192.168.0.9
 
</font>
 
</font>
====Output====
 
* '''uImage'''
 
  
====Notes====
+
{|
* Kernel version is 4.0, linux-xlnx
+
|[[File:Check versions.png|thumb|400px|check_versions.py output in terminal (web-393 revision on PC is ahead of the one installed on the camera)]]
* Device Tree Blob is compiled separately in linux-xlnx
+
|}
* Uncompiled device tree files are present in the linux sources provided by linux-xlnx
 
 
 
===<font color="blue">Rootfs</font>===
 
<font size='2'>
 
bitbake core-image-elphel393
 
</font>
 
====Output====
 
* '''rootfs.tar.gz'''
 
* '''rootfs.ubi''','''rootfs.ubifs'''
 
  
 
==<font color="blue">Details for development</font>==
 
==<font color="blue">Details for development</font>==
 
[[Development_for_10393|'''Development for 10393''']]
 
[[Development_for_10393|'''Development for 10393''']]
<br/>
 
<br/>
 
 
==<font color="blue">Notes</font>==
 
* <span style='color:green'>[FIXED]</span> 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?!!
 
 
<b>solution</b>: 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: <font size='2' color='green'><b>do_compile[nostamp]="1"</b></font>
 
or
 
recipe-class-inside-task: <font size='2' color='green'><b>d.setVarFlag('do_compile', 'nostamp', '1')</b></font>
 
 
* clone git repo over https in a recipe
 
SRC_URI = "git://git.elphel.com/project.git;protocol=https;branch=master"
 
 
==<font color="blue">Errors</font>==
 
* '''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
 

Latest revision as of 12:22, 1 June 2022

Description

Build the firmware for Elphel 10393 series camera systems from scratch.

Prebuilt releases can be found here.

Use cases

  • Update Linux Kernel when developing a driver
  • Include application to the default firmware package
  • 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 written in Python, PHP, Javascript, HTML, C/C++ (gcc is installed on the system board) can be developed on the camera. Installing the framework is not required but it can simplify the development process.

Description

  • Building embedded Linux image for Zynq ARMv7 platform - Elphel 10393 board
  • Yocto Poky revision = 2.7.1 (Warrior) - builds in Kubuntu 20.04. Older OSes are not supported. Roll back to get built in 16.04.
  • Yocto Poky revision = 2.4 (Rocko) - builds in Kubuntu 16.04. Won't build in 18.04 or 20.04.
  • Yocto Poky revision = 2.0 (Jethro)

Features

  • 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 20.04 x64
  • Kubuntu 18.04 x64 (as of Dec 2018) - Poky: 2.7.1 Warrior (not tested but might build w/o problems)
  • Kubuntu 16.04 x64 (as of Dec 2018) - Poky: 2.4 Rocko, 2.7.1 Warrior

Output files

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

File(s) Build Command Description
boot.bin bitbake u-boot u-boot as the first stage bootloader = Secondary Program Loader (SPL) that boots u-boot-dtb.img
u-boot-dtb.img bitbake u-boot full size u-boot with a stripped device tree (cat u-boot.img some_stripped_devicetree.dtb > u-boot-dtb.img)
devicetree.dtb bitbake device-tree 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 bitbake linux-xlnx kernel, drivers
rootfs.ubifs, rootfs.ubi, rootfs.tar.gz bitbake core-image-elphel393 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

Setup

  • Before building

Installing some dependencies:

sudo apt install git build-essential chrpath diffstat gawk texinfo zlib1g-dev python3-numpy libssl-dev

Installing old python2.7 (bitbake snapshot that we used has problem with python3.8):

sudo apt install python2.7
sudo ln -s python2.7 python2
sudo ln -s python2.7 python
  • Poky 2.7.1 Warrior (Kubuntu 20.04)

git clone -b warrior https://git.elphel.com/Elphel/elphel393.git

If you are a developer and plan to commit changes you should use ssh access instead: git clone -b warrior git@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 (Kubuntu 16.04)

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

  • Notes (required actions are already listed above): When trying to run bitbake on a new install got problems with older bitbake version (current build uses specific snapshot) and python3.8. So I install old python2.7 and linked it:
sudo apt install python2.7 python-numpy
sudo ln -s python2.7 python2
sudo ln -s python2.7 python

After this bitbake just complained about missing tools (git, build-essential were already installed):

sudo apt install chrpath diffstat gawk makeinfo

Program test_mcntrl.py that builds x393.h header files from FPGA code that runs during ./setup.py requires numpy and results in error output if missing Still setup.py continues, you need to look through its output few lines after

* x393
git host: git.elphel.com
Clone and checkout: x393

You may install numpy with

sudo apt install python3-numpy

If you did not notice missing numpy, then during bitbake you will get error "build No rule to make target 'drivers/elphel/x393.o', needed by 'drivers/elphel/built-in.a'. Stop." in that case you need to install numpy, re-run setup.py (make sure numpy error is gone) then re-create linux kernel links during next build by erasing old ones:

bitbake linux-xlnx -c clean

and re-running

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

When building php: configure: error: zip support requires ZLIB. Use --with-zlib-dir=<DIR> to specify prefix where ZLIB include and library are located

sudo apt install zlib1g-dev

Compare built vs deployed software versions

cd elphel393
./check_versions.py root@192.168.0.9

check_versions.py output in terminal (web-393 revision on PC is ahead of the one installed on the camera)

Details for development

Development for 10393