Difference between revisions of "Poky manual"
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Revision as of 16:25, 14 April 2016
Contents
Description
- Building embedded Linux image for Zynq ARMv7 platform - Elphel 10393 board
About
- Yocto Poky revision = 2.0
- Host OS = Kubuntu 14.04.3 LTS x64
Required packages
- Found in Yocto Project mega-manual
Output files
Found in the poky's deploy directory:
- files for rootfs in NAND Flash: poky/build/tmp/deploy/images/elphel393/nand/
- files for rootfs on MMC (micro SD card): poky/build/tmp/deploy/images/elphel393/mmc/
These 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
- 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
- uImage - kernel, drivers
- rootfs.ubifs or rootfs.tar.gz - rootfs
Boot options
Boot from micro SD card (rootfs)
- The micro SD card/adapter must be modified for this boot mode (to keep CD pin high) - only then the camera will boot
- EXT4 partition mounted as /
- Detailed instructions
Boot from NAND flash (rootfs)
- The default boot option - power on.
- A UBIFS image is written to /dev/mtd4 - is mounted as /
- Detailed instructions
Notes
- It is possible to unpack rootfs to RAM not mounting any partitions (/ in RAM, ramdisk):
- Changes are not stored
- Boot faster?
- Work faster?
- Modify env commands in the u-boot (in elphel393.h or when in the u-boot command line)
- Carefully check the actual and hardcoded images' sizes in the u-boot (elphel393.h) and the device tree (elphel393_xxx.dts) with the actual sizes.
Setup
$ git clone https://github.com/Elphel/elphel393.git $ cd elphel393 $ source setup.sh
Build bootloader
bitbake u-boot-ezynq or bitbake u-boot or bitbake virtual/bootloader
Output
- poky/build/tmp/deploy/images/<machine>/boot.bin
- poky/build/tmp/deploy/images/<machine>/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
Compile devicetree
bitbake device-tree
Output
- poky/build/tmp/deploy/images/<machine>/devicetree.dtb
Build kernel
bitbake linux-xlnx or bitbake virtual/kernel
Output
- poky/build/tmp/deploy/images/<machine>/uImage (kernel)
Notes
- Kernel version is 4.0, 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
Build ramdisk.image.gz
bitbake core-image-elphel393
Output
- poky/build/tmp/deploy/images/<machine>/uramdisk.image.gz (the file has *.u-boot extension after it's built)
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
