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43 lines
1.6 KiB
Markdown
43 lines
1.6 KiB
Markdown
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Utgard
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======
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Utgard is an old architecture, but it is the architecture of very cheap and
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popular boards.
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There are two drivers for it: an open-source one (Lima) and a closed-source,
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legacy one.
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## Lima Driver
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One way to install the Lima driver is to start from the armbian buster
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"server" image appropriate to your board, install the -dev version of the
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Linux kernel and compile the latest mesa yourself.
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On my test A10-based board, I have to use the following environment variables:
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export FRT_KMSDRM_DEVICE=/dev/dri/renderD128
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export LD_LIBRARY_PATH=/usr/local/lib
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Some 2.1 demos don't work (among others, IIRC, one of the two 3D materials and
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the 2D isometric light one), but most 2D demos, and the 2D platformer in
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particular, run well.
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## Legacy Driver
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If you ever wondered why the official FRT binaries are compiled on a jessie
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debootstrap chroot, this driver is the reason.
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It is a pain to use because it only supports old versions of the Linux kernel,
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but it is full-featured. The Lima driver is already useable and it is the one
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I would personally use, but for some use cases, the legacy driver is still the
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way to go.
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I recommend that you use a X11-based image.
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In theory, you could start from a server image and compile a couple of
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libraries to go along with the proprietary blob, but you are basically on your
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own. FRT includes a fbdev video module, but it is more of starting point /
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proof of concept than an useable module. It works but it flickers badly, and I
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no longer maintain it. Anyway, if you have one of these boards, and you are up
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for a challenge, patches are welcome.
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