[PATCH 3/6] board: ti: am62x: Avoid overwriting reserve mem for AM62 SIP

[Nitin Yadav]

AM62 SIP has 512MB RAM. But the top of the RAM is reserved for
TF-A and OPTEE. U-Boot relocating there would cause overwriting
of these reserved regions. Fix this by limit U-Boot to first
64MB of RAM for all boards with 512MB.

Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
Signed-off-by: Nitin Yadav <n-yadav at ti.com>
---
 board/ti/am62x/evm.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/board/ti/am62x/evm.c b/board/ti/am62x/evm.c
index ad93908840..ad3e415592 100644
--- a/board/ti/am62x/evm.c
+++ b/board/ti/am62x/evm.c
@@ -18,6 +18,7 @@
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
 #include <dm/uclass.h>
+#include <linux/sizes.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -59,6 +60,16 @@ int dram_init_banksize(void)
 	return fdtdec_setup_memory_banksize();
 }
 
+phys_size_t get_effective_memsize(void)
+{
+	/*
+	* Just below 512MB are TF-A and OPTEE reserve regions, thus
+	* SPL/U-Boot RAM has to start below that. Leave 64MB space for
+	* all reserved memories.
+	*/
+	return gd->ram_size == SZ_512M ? SZ_512M - SZ_64M : gd->ram_size;
+}
+
 #if defined(CONFIG_SPL_BUILD)
 static int video_setup(void)
 {
-- 
2.25.1