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[RFC,02/18] ARM: bcm2835: DMA can only address 1GB

Message ID 1563393026-17118-3-git-send-email-wahrenst@gmx.net (mailing list archive)
State New, archived
Headers show
Series ARM: Add minimal Raspberry Pi 4 support | expand

Commit Message

Stefan Wahren July 17, 2019, 7:50 p.m. UTC 
From: Phil Elwell <phil@raspberrypi.org>

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

--
2.7.4
diff mbox series

Patch

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