I'm building for multiple ARM i.MX6 platforms. These have
the same SoC, but slightly different peripherals. As far as
I can tell, they should be able to share everything except
for a few ${MACHINE} specific packages, e.g. the kernel and
u-boot.
Sadly, that doesn't seem to be the case. The architecture
specific packages are being split into two categories - plain
ARM/Cortex-A9 and those that have i.MX6 specific optimizations.
For example, after building a complete image (on the order of
core-image-sato), I have this split:
$ ls tmp/work/cortexa9hf-vfp-neon-amltd-linux-gnueabi/
acl gst-player libsamplerate0
modutils-initscripts shadow-sysroot
alsa-utils gst-plugins-bad libsm mpeg2dec
shared-mime-info
apmd gst-plugins-good libsndfile1 mplayer2
speex
atk gst-plugins-ugly libsoup-2.4 mtdev
sqlite3
attr gstreamer libtheora ncurses
startup-notification
base-passwd gstreamer1.0 libtirpc neon
strace
...
gst-ffmpeg libpostproc matchbox-wm
scrnsaverproto zlib
gst-fluendo-mpegmux libproxy mkfontdir
settings-daemon
gst-meta-base libpthread-stubs mkfontscale shadow
$ ls tmp/work/cortexa9hf-vfp-neon-mx6qdl-amltd-linux-gnueabi/
alsa-lib gst-plugins-base imx-gpu-viv libfslparser libsdl
xf86-video-imxfb-vivante
cairo gstreamer1.0-plugins-bad libdrm libfslvpuwrap mesa
xserver-xorg
firmware-imx gstreamer1.0-plugins-base libfslcodec libglu pulseaudio
It's the second category that is causing problems. They do not
seem to end up in any shareable sstate at all. If I try to rebuild
using only sstate, i.e. build my complete image to success, then
remove 'tmp' and rebuild, using the sstate-cache from the first go,
all of the above packages (alsa-lib, ..., xserver-xorg) are all
rebuilt from scratch. Those recipes do seem to end in my sstate-cache,
but they are never reused from it.
What would make this happen? How can I prevent it?
As is, sstate is not really shareable between these i.MX6 targets
as so much is being rebuilt all the time...
Any ideas or pointers gladly welcomed.
Thanks
--
------------------------------------------------------------
Gary Thomas | Consulting for the
MLB Associates | Embedded world
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