git.ipfire.org Git - thirdparty/openwrt.git/blob

   1 From 017f788741107824346784a5f342b88013f885d0 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Fri, 19 Apr 2024 11:35:41 +0100
   4 Subject: [PATCH 1038/1085] overlays/README: Document that vc4-(f)kms requires
   5  >=512MB
   6
   7 The firmware stops vc4-kms-v3d and vc4-fkms-v3d loading if the
   8 system has less than 512MB of RAM. It can work if gpu_mem and
   9 CMA heap size are set appropriately, but can't be guaranteed.
  10 Document this restriction.
  11
  12 Also drops Eric's name from the overlay description as it
  13 isn't relevant or accurate anymore.
  14
  15 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  16 ---
  17  arch/arm/boot/dts/overlays/README | 12 ++++++++----
  18  1 file changed, 8 insertions(+), 4 deletions(-)
  19
  20 --- a/arch/arm/boot/dts/overlays/README
  21 +++ b/arch/arm/boot/dts/overlays/README
  22 @@ -4864,8 +4864,10 @@ Params: <None>
  23
  24
  25  Name:   vc4-fkms-v3d
  26 -Info:   Enable Eric Anholt's DRM VC4 V3D driver on top of the dispmanx
  27 +Info:   Enable the kernel DRM VC4 V3D driver on top of the dispmanx
  28          display stack.
  29 +        NB The firmware will not allow this overlay to load on a Pi with less
  30 +        than 512MB as memory is too tight.
  31  Load:   dtoverlay=vc4-fkms-v3d,<param>
  32  Params: cma-512                 CMA is 512MB (needs 1GB)
  33          cma-448                 CMA is 448MB (needs 1GB)
  34 @@ -4881,7 +4883,7 @@ Params: cma-512                 CMA is 5
  35
  36
  37  Name:   vc4-fkms-v3d-pi4
  38 -Info:   Enable Eric Anholt's DRM VC4 V3D driver on top of the dispmanx
  39 +Info:   Enable the kernel DRM VC4 V3D driver on top of the dispmanx
  40          display stack.
  41  Load:   dtoverlay=vc4-fkms-v3d-pi4,<param>
  42  Params: cma-512                 CMA is 512MB (needs 1GB)
  43 @@ -5150,7 +5152,9 @@ Load:   <Deprecated>
  44
  45
  46  Name:   vc4-kms-v3d
  47 -Info:   Enable Eric Anholt's DRM VC4 HDMI/HVS/V3D driver.
  48 +Info:   Enable the kernel DRM VC4 HDMI/HVS/V3D driver.
  49 +        NB The firmware will not allow this overlay to load on a Pi with less
  50 +        than 512MB as memory is too tight.
  51  Load:   dtoverlay=vc4-kms-v3d,<param>
  52  Params: cma-512                 CMA is 512MB (needs 1GB)
  53          cma-448                 CMA is 448MB (needs 1GB)
  54 @@ -5171,7 +5175,7 @@ Params: cma-512                 CMA is 5
  55
  56
  57  Name:   vc4-kms-v3d-pi4
  58 -Info:   Enable Eric Anholt's DRM VC4 HDMI/HVS/V3D driver for Pi4.
  59 +Info:   Enable the kernel DRM VC4 HDMI/HVS/V3D driver for Pi4.
  60  Load:   dtoverlay=vc4-kms-v3d-pi4,<param>
  61  Params: cma-512                 CMA is 512MB
  62          cma-448                 CMA is 448MB