Your message dated Thu, 28 May 2026 23:38:59 +0200
with message-id <[email protected]>
and subject line Re: Bug#1138060: riscv64: please enable contiguous memory
allocator (CMA) support, needed for HDMI displays
has caused the Debian Bug report #1138060,
regarding riscv64: please enable contiguous memory allocator (CMA) support,
needed for HDMI displays
to be marked as done.
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Bug report if necessary, and/or fix the problem forthwith.
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1138060: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1138060
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--- Begin Message ---
Source: linux
Severity: wishlist
X-Debbugs-Cc: [email protected]
User: [email protected]
Usertags: riscv64
Dear maintainer,
Please enable CMA on riscv64.
CONFIG_CMA=y
CONFIG_DMA_CMA=y
This is required on SBCs (e.g. with JH7110 or TH1520) to allocate the
framebuffer for normal HD displays at 1920x1080 or higher.
Without this, the display falls back to something like 1024×768 and typically
stays black.
I am currently using `cma=128M` on the cmdline which works fine at 1920x1080.
Best
-Dominique
--- End Message ---
--- Begin Message ---
Version: 7.1~rc3-1~exp1
Hi,
On 2026-05-28 00:47, Dominique Belhachemi wrote:
> On Wed, May 27, 2026 at 3:54 PM Aurelien Jarno <[email protected]> wrote:
> >
> > Hi Dominique,
> >
> > On 2026-05-27 13:34, Dominique Belhachemi wrote:
> > > Source: linux
> > > Severity: wishlist
> > > X-Debbugs-Cc: [email protected]
> > > User: [email protected]
> > > 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.
Thanks for the confirmation. I am therefore closing this bug with that
version.
Regards
Aurelien
--
Aurelien Jarno GPG: 4096R/1DDD8C9B
[email protected] http://aurel32.net
--- End Message ---
