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Groups > linux.debian.kernel > #92802
| From | Dominique Belhachemi <domibel@debian.org> |
|---|---|
| Newsgroups | linux.debian.bugs.dist, linux.debian.kernel |
| Subject | Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays |
| Date | 2026-05-28 06:50 +0200 |
| Message-ID | <MZAQV-8rnS-5@gated-at.bofh.it> (permalink) |
| References | <MZqox-8kg0-1@gated-at.bofh.it> <MZsA1-8lFB-3@gated-at.bofh.it> <MZqox-8kg0-1@gated-at.bofh.it> <MZsA1-8lFB-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Cross-posted to 2 groups.
On Wed, May 27, 2026 at 3:54 PM Aurelien Jarno <aurel32@debian.org> wrote:
>
> Hi Dominique,
>
> On 2026-05-27 13:34, Dominique Belhachemi wrote:
> > Source: linux
> > Severity: wishlist
> > X-Debbugs-Cc: debian-riscv@lists.debian.org
> > User: debian-riscv@lists.debian.org
> > Usertags: riscv64
> >
> > Dear maintainer,
> >
> > Please enable CMA on riscv64.
> >
> > CONFIG_CMA=y
> > CONFIG_DMA_CMA=y
>
> Both options got enabled starting with linux 7.1~rc3-1~exp1, currently
> available in experimental. Could you please confirm that it works for
> your use case?
>
Hi Aurelien,
Thank you, yes it works. I just tested it with 7.1~rc4-1~exp1 on a
VisionFive 2 SBC with additional HDMI patches.
Debian's kernel config uses
CONFIG_CMA_SIZE_MBYTES=64
which is good enough for two 1920x1080 framebuffers.
For 4K I could simply specify cma=128M on the cmdline.
Best
-Dominique
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Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays Dominique Belhachemi <domibel@debian.org> - 2026-05-27 19:40 +0200
Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays Aurelien Jarno <aurel32@debian.org> - 2026-05-27 22:00 +0200
Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays Dominique Belhachemi <domibel@debian.org> - 2026-05-28 06:50 +0200
Bug#1138060: riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays Aurelien Jarno <aurel32@debian.org> - 2026-05-28 23:50 +0200
Bug#1138060: marked as done (riscv64: please enable contiguous memory allocator (CMA) support, needed for HDMI displays) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-29 06:40 +0200
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