Not all memory is mapped in the MMU. So we need to restrict the memory
size so that U-Boot does not try to access it. Also, the internal
registers are located at 0xf000.0000 - 0xffff.ffff. Currently only 2GiB
are mapped for system memory. This is what we pass to the U-Boot
subsystem here.
Signed-off-by: Stefan Roese <s...@denx.de>
Cc: Nadav Haklai <nad...@marvell.com>
Cc: Neta Zur Hershkovits <n...@marvell.com>
Cc: Kostya Porotchkin <kos...@marvell.com>
Cc: Omri Itach <om...@marvell.com>
Cc: Igal Liberman <ig...@marvell.com>
Cc: Haim Boot <ha...@marvell.com>
Cc: Hanna Hawa <han...@marvell.com>
---
arch/arm/mach-mvebu/arm64-common.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/arch/arm/mach-mvebu/arm64-common.c
b/arch/arm/mach-mvebu/arm64-common.c
index 1fc2ff2..8f02655 100644
--- a/arch/arm/mach-mvebu/arm64-common.c
+++ b/arch/arm/mach-mvebu/arm64-common.c
@@ -17,6 +17,23 @@
DECLARE_GLOBAL_DATA_PTR;
/*
+ * Not all memory is mapped in the MMU. So we need to restrict the
+ * memory size so that U-Boot does not try to access it. Also, the
+ * internal registers are located at 0xf000.0000 - 0xffff.ffff.
+ * Currently only 2GiB are mapped for system memory. This is what
+ * we pass to the U-Boot subsystem here.
+ */
+#define USABLE_RAM_SIZE 0x80000000
+
+ulong board_get_usable_ram_top(ulong total_size)
+{
+ if (gd->ram_size > USABLE_RAM_SIZE)
+ return USABLE_RAM_SIZE;
+
+ return gd->ram_size;
+}
+
+/*
* On ARMv8, MBus is not configured in U-Boot. To enable compilation
* of the already implemented drivers, lets add a dummy version of
* this function so that linking does not fail.
--
2.10.2
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