Patches on the U-Boot mailing list from Rockchip engineers
indicate, that the RK3399's DMA engines are not able to use
addresses in high-memory (above 0xf8000000).
This patch models this restriction in an RK3399 specific
mach_addr_is_dmaable() function.
Signed-off-by: Christoph Muellner <christoph.muell...@theobroma-systems.com>
---
arch/arm/mach-rockchip/rk3399/rk3399.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/arch/arm/mach-rockchip/rk3399/rk3399.c
b/arch/arm/mach-rockchip/rk3399/rk3399.c
index a7ccd4f3ed..15b03726eb 100644
--- a/arch/arm/mach-rockchip/rk3399/rk3399.c
+++ b/arch/arm/mach-rockchip/rk3399/rk3399.c
@@ -109,3 +109,14 @@ void board_debug_uart_init(void)
#endif
}
#endif
+
+int mach_addr_is_dmaable(unsigned long addr)
+{
+ /*
+ * The RK3399 cannot cope with high-memory DMA target/sources.
+ */
+ if (addr < 0xf8000000UL)
+ return 1;
+
+ return 0;
+}
--
2.11.0
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