Thanks for the confirmation.
Actually I wasn't expecting the eglfs_viv[_wl] stuff to even work with
current releases of the Vivante blob, but after a short test it does
indeed work (however performance appears to be much worse than using
eglfs_kms). Anyway, I don't really see a reason for anyone to stay on
that deprecated interface though, considering the relative immaturity of
the platform.
Thanks again,
Laszlo Agocs wrote on 11.09.19 15:31:
Hi,
Yes, it is a trend to move away from basing EGL/OpenGL implementations
on top of the (deprecated) fbdev, and instead move onto drm. Sometimes,
and I suspect this is the case with Vivante as well, vendors offer both
variants of the drivers. With eglfs this means the backend has to be
selected based on what's there in the system at run time. (in this case
this means choosing between eglfs_viv[_wl] or eglfs_kms)
Qt upstream has no explicit support for i.MX8 (there are no device specs
in mkspecs/devices since none got contributed so far), but, as you also
found out, eglfs is known to work, so in that sense the i.MX8 is
supported. Don't know if Wayland got tested so far.
I suppose Yocto and other distro build tools have Qt available for i.MX8
targets as well. How they configure things there (what drivers, which
eglfs backend) is up to them. For example, as I understand, the
pre-built, Yocto-based reference images from the commercial Qt for
Device Creation offering are still using the fbdev-based stack and so
the eglfs_viv path for i.MX8. (but I could be wrong here)
Best regards,
Laszlo
------------------------------------------------------------------------
*From:* Development <development-boun...@qt-project.org> on behalf of
Zeno Endemann via Development <development@qt-project.org>
*Sent:* Wednesday, September 11, 2019 2:53 PM
*To:* development@qt-project.org <development@qt-project.org>
*Subject:* [Development] i.MX8 embedded Linux support
Hi,
So unless I misunderstand something, for the i.MX8 NXP/Vivante changed
their proprietary graphic stack significantly. The framebuffer and X11
driver are deprecated, only Wayland will be supported, and they have
switched from the Linux framebuffer interface to (a fork of) libdrm.
I was able to run a Qt Quick application on an i.MX8M Mini using this
new infrastructure, i.e. using the regular eglfs_kms platform plugin. So
I am wondering if the qtbase configure script should be adapted to
detect i.MX8, and for that not build eglfs_viv, eglfs_viv_wl and
eglfs_kms_egldevice anymore.
Or more generally I'd like to ask if there is already further work or
information on supporting embedded Linux on i.MX8. For example, I
suppose the yocto layer needs some updates to reflect all this.
Thanks,
Zeno Endemann
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