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63 lines
2.4 KiB
Diff
63 lines
2.4 KiB
Diff
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From 017f788741107824346784a5f342b88013f885d0 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Fri, 19 Apr 2024 11:35:41 +0100
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Subject: [PATCH 1038/1085] overlays/README: Document that vc4-(f)kms requires
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>=512MB
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The firmware stops vc4-kms-v3d and vc4-fkms-v3d loading if the
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system has less than 512MB of RAM. It can work if gpu_mem and
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CMA heap size are set appropriately, but can't be guaranteed.
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Document this restriction.
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Also drops Eric's name from the overlay description as it
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isn't relevant or accurate anymore.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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arch/arm/boot/dts/overlays/README | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -4864,8 +4864,10 @@ Params: <None>
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Name: vc4-fkms-v3d
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-Info: Enable Eric Anholt's DRM VC4 V3D driver on top of the dispmanx
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+Info: Enable the kernel DRM VC4 V3D driver on top of the dispmanx
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display stack.
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+ NB The firmware will not allow this overlay to load on a Pi with less
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+ than 512MB as memory is too tight.
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Load: dtoverlay=vc4-fkms-v3d,<param>
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Params: cma-512 CMA is 512MB (needs 1GB)
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cma-448 CMA is 448MB (needs 1GB)
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@@ -4881,7 +4883,7 @@ Params: cma-512 CMA is 5
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Name: vc4-fkms-v3d-pi4
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-Info: Enable Eric Anholt's DRM VC4 V3D driver on top of the dispmanx
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+Info: Enable the kernel DRM VC4 V3D driver on top of the dispmanx
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display stack.
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Load: dtoverlay=vc4-fkms-v3d-pi4,<param>
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Params: cma-512 CMA is 512MB (needs 1GB)
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@@ -5150,7 +5152,9 @@ Load: <Deprecated>
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Name: vc4-kms-v3d
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-Info: Enable Eric Anholt's DRM VC4 HDMI/HVS/V3D driver.
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+Info: Enable the kernel DRM VC4 HDMI/HVS/V3D driver.
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+ NB The firmware will not allow this overlay to load on a Pi with less
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+ than 512MB as memory is too tight.
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Load: dtoverlay=vc4-kms-v3d,<param>
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Params: cma-512 CMA is 512MB (needs 1GB)
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cma-448 CMA is 448MB (needs 1GB)
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@@ -5171,7 +5175,7 @@ Params: cma-512 CMA is 5
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Name: vc4-kms-v3d-pi4
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-Info: Enable Eric Anholt's DRM VC4 HDMI/HVS/V3D driver for Pi4.
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+Info: Enable the kernel DRM VC4 HDMI/HVS/V3D driver for Pi4.
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Load: dtoverlay=vc4-kms-v3d-pi4,<param>
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Params: cma-512 CMA is 512MB
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cma-448 CMA is 448MB
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