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List:       freebsd-hackers
Subject:    [can freebsd utilise gpu split memory on rpi4]
From:       void <void () f-m ! fm>
Date:       2022-09-11 15:31:21
Message-ID: Yx3/SeQEk0+wmisE () void ! f-m ! fm
[Download RAW message or body]

Hello,

Posting this here in the hope that someone might know
a bit about arm64 internals in the way cpu/gmu memory split
applies or doesn't apply for x11 etc on -current. TIA

----- Forwarded message from void <void@f-m.fm> -----

Date: Sun, 4 Sep 2022 15:00:35 +0100
From: void <void@f-m.fm>
To: freebsd-arm@freebsd.org
Subject: can freebsd utilise gpu split memory on rpi4
Mail-Followup-To: freebsd-arm@freebsd.org
List-Id: Porting FreeBSD to ARM processors <freebsd-arm.freebsd.org>

Hi,

tl;dr : I'm trying to make a freebsd desktop configuration
for rpi4b.

Is freebsd able to utilise the GPU part of the raspberry pi 4b?
In config.txt there can be a GPU_MEM statement for a variable size,
the remaining memory being used by the CPU. Would it make sense to
set this as large as possible for a desktop environment, or
will it simply subtract from available memory and not be used, or does it not 
have any effect at all in freebsd/xorg ?

GPU memory split appears under legacy options.

https://www.raspberrypi.com/documentation/computers/config_txt.html#legacy-options

it's not clear to me if these would even work under latest
firmware.

-- 


----- End forwarded message -----

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