From 64c0d9e010dabdd0f9fcfd68e6e94e7ba831ea6a Mon Sep 17 00:00:00 2001
From: Vignesh Raghavendra <vigneshr@ti.com>
Date: Fri, 22 Sep 2023 19:46:47 +0530
Subject: [PATCH] board: ti: am62x: Avoid overwriting reserve mem for AM62 SIP

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 256MB of RAM for all boards
with 512MB.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
---
 board/ti/am62x/evm.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/board/ti/am62x/evm.c b/board/ti/am62x/evm.c
index 79c37b696b..3b6f5be472 100644
--- a/board/ti/am62x/evm.c
+++ b/board/ti/am62x/evm.c
@@ -23,6 +23,8 @@
 #include <asm/gpio.h>
 #include <cpu_func.h>
 
+#include <linux/sizes.h>
+
 #include "../common/board_detect.h"
 
 DECLARE_GLOBAL_DATA_PTR;
@@ -86,6 +88,16 @@ 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 256MB space for
+	 * all reserved memories.
+	 */
+	return gd->ram_size == SZ_512M ?  SZ_256M : gd->ram_size;
+}
+
 #if defined(CONFIG_SPL_BUILD)
 static int video_setup(void)
 {