You can already test it with Debian PowerPC (PPC32) and with MintPPC.
Instructions:
Please add the Debian experimental repo to the file /etc/apt/sources.list:
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deb http://deb.debian.org/debian-ports experimental main
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apt update
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apt install -t experimental libgl1-mesa-dri libgl1-mesa-glx mesa-utils
I tested this Mesa upgrade today and it works.
apt show libgl1-mesa-dri -a
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Package: libgl1-mesa-dri
Version: 22.0.0-1
Priority: optional
Section: libs
Source: mesa
Maintainer: Debian X Strike Force <debian-x@lists.debian.org>
Installed-Size: 22.0 MB
Depends: libatomic1 (>= 4.8), libc6 (>= 2.33), libdrm-amdgpu1 (>= 2.4.105), libdrm-nouveau2 (>= 2.4.66), libdrm-radeon1 (>= 2.4.31), libdrm2 (>= 2.4.75), libelf1 (>= 0.142), libexpat1 (>= 2.0.1), libgcc-s1 (>= 4.2), libglapi-mesa (= 22.0.0-1), libllvm13, libsensors5 (>= 1:3.5.0), libstdc++6 (>= 11), libvulkan1 (>= 1.2.131.2), libzstd1 (>= 1.4.0), zlib1g (>= 1:1.1.4)
Homepage: https://mesa3d.org/
Task: desktop
Download-Size: 5,096 kB
APT-Manual-Installed: yes
APT-Sources: http://deb.debian.org/debian-ports experimental/main powerpc Packages
Description: free implementation of the OpenGL API -- DRI modules
This version of Mesa provides GLX and DRI capabilities: it is capable of
both direct and indirect rendering. For direct rendering, it can use DRI
modules from the libgl1-mesa-dri package to accelerate drawing.
.
This package does not include the OpenGL library itself, only the DRI
modules for accelerating direct rendering.
.
For a complete description of Mesa, please look at the
libglx-mesa0 package.
Package: libgl1-mesa-dri
Version: 21.3.7-1
Priority: optional
Section: libs
Source: mesa
Maintainer: Debian X Strike Force <debian-x@lists.debian.org>
Installed-Size: 31.7 MB
Depends: libatomic1 (>= 4.8), libc6 (>= 2.33), libdrm-amdgpu1 (>= 2.4.105), libdrm-nouveau2 (>= 2.4.66), libdrm-radeon1 (>= 2.4.31), libdrm2 (>= 2.4.75), libelf1 (>= 0.142), libexpat1 (>= 2.0.1), libgcc-s1 (>= 4.2), libglapi-mesa (= 21.3.7-1), libllvm13, libsensors5 (>= 1:3.5.0), libstdc++6 (>= 11), libvulkan1 (>= 1.2.131.2), libzstd1 (>= 1.4.0), zlib1g (>= 1:1.1.4)
Homepage: https://mesa3d.org/
Task: desktop
Download-Size: 7,181 kB
APT-Sources: http://deb.debian.org/debian-ports sid/main powerpc Packages
Description: free implementation of the OpenGL API -- DRI modules
This version of Mesa provides GLX and DRI capabilities: it is capable of
both direct and indirect rendering. For direct rendering, it can use DRI
modules from the libgl1-mesa-dri package to accelerate drawing.
.
This package does not include the OpenGL library itself, only the DRI
modules for accelerating direct rendering.
.
For a complete description of Mesa, please look at the
libglx-mesa0 package.