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From 7b307016ed13cbb65e08b6a704912e5c9e5b81ac Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Tue, 14 Apr 2020 15:25:02 +0100
Subject: [PATCH] ARM: dts: bcm2711: Restrict CMA to first 768MB
The downstream 32-bit 2711 kernel configuration enables HIGHMEM for
access to more physical RAM. The HIGHMEM zone starts at 0x30000000
(768MB), and allowing the CMA zone to overlap that area causes a
failure during CMA activation.
Avoid the overlap by limiting CMA to the first 768MB. This is overly
restrictive on a 64-bit kernel, but shouldn't cause any practical
problems.
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
arch/arm/boot/dts/bcm2711-rpi.dtsi | 5 +++++
1 file changed, 5 insertions(+)
--- a/arch/arm/boot/dts/bcm2711-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2711-rpi.dtsi
@@ -45,6 +45,11 @@
};
};
+&cma {
+ /* Limit cma to the lower 768MB to allow room for HIGHMEM on 32-bit */
+ alloc-ranges = <0x0 0x00000000 0x30000000>;
+};
+
&soc {
thermal: thermal@7d5d2200 {
compatible = "brcm,avs-tmon-bcm2711";
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