Commit d98a8dbd authored by Nicolas Saenz Julienne's avatar Nicolas Saenz Julienne Committed by Florian Fainelli

ARM: dts: bcm2711: force CMA into first GB of memory

arm64 places the CMA in ZONE_DMA32, which is not good enough for the
Raspberry Pi 4 since it contains peripherals that can only address the
first GB of memory. Explicitly place the CMA into that area.
Signed-off-by: default avatarNicolas Saenz Julienne <nsaenzjulienne@suse.de>
Acked-by: default avatarStefan Wahren <wahrenst@gmx.net>
Signed-off-by: default avatarFlorian Fainelli <f.fainelli@gmail.com>
parent 4c365e23
...@@ -12,6 +12,26 @@ / { ...@@ -12,6 +12,26 @@ / {
interrupt-parent = <&gicv2>; interrupt-parent = <&gicv2>;
reserved-memory {
#address-cells = <2>;
#size-cells = <1>;
ranges;
/*
* arm64 reserves the CMA by default somewhere in ZONE_DMA32,
* that's not good enough for the BCM2711 as some devices can
* only address the lower 1G of memory (ZONE_DMA).
*/
linux,cma {
compatible = "shared-dma-pool";
size = <0x2000000>; /* 32MB */
alloc-ranges = <0x0 0x00000000 0x40000000>;
reusable;
linux,cma-default;
};
};
soc { soc {
/* /*
* Defined ranges: * Defined ranges:
......
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