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From 9334afe7293b3a78b7e070a70880b2db7aa98365 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 29 May 2019 15:47:42 +0100
Subject: [PATCH] arm: bcm2835: DMA can only address 1GB
The legacy peripherals can only address the first gigabyte of RAM, so
ensure that DMA allocations are restricted to that region.
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/mach-bcm/board_bcm2835.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/arm/mach-bcm/board_bcm2835.c
+++ b/arch/arm/mach-bcm/board_bcm2835.c
@@ -123,6 +123,9 @@ static const char * const bcm2835_compat
};
DT_MACHINE_START(BCM2835, "BCM2835")
+#if defined(CONFIG_ZONE_DMA) && defined(CONFIG_ARM_LPAE)
+ .dma_zone_size = SZ_1G,
+#endif
.map_io = bcm2835_map_io,
.init_machine = bcm2835_init,
.dt_compat = bcm2835_compat,
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