[02/18] ARM: bcm2835: DMA can only address 1GB
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Message ID 1563774880-8061-3-git-send-email-wahrenst@gmx.net
State New
Headers show
Series
  • ARM: Add minimal Raspberry Pi 4 support
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Commit Message

Stefan Wahren July 22, 2019, 5:54 a.m. UTC
From: Phil Elwell <phil@raspberrypi.org>

The legacy peripherals on BCM2711 & BCM2835 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>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
---
 arch/arm/mach-bcm/board_bcm2835.c | 1 +
 1 file changed, 1 insertion(+)

--
2.7.4

Patch
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diff --git a/arch/arm/mach-bcm/board_bcm2835.c b/arch/arm/mach-bcm/board_bcm2835.c
index bfc556f..d2b31a9 100644
--- a/arch/arm/mach-bcm/board_bcm2835.c
+++ b/arch/arm/mach-bcm/board_bcm2835.c
@@ -24,6 +24,7 @@  static const char * const bcm2835_compat[] = {
 };

 DT_MACHINE_START(BCM2835, "BCM2835")
+	.dma_zone_size	= SZ_1G,
 	.dt_compat = bcm2835_compat,
 	.smp = smp_ops(bcm2836_smp_ops),
 MACHINE_END