[PATCH v4 11/15] board: ns3: limit U-boot relocation within 16MB memory

[Rayagonda Kokatanur]

From: Bharat Kumar Reddy Gooty <bharat.gooty at broadcom.com>

By default relocation happens to a higher address of DDR,
i.e, DDR start + DDR size.

U-Boot shall be used to collect the ramdump.
Restrict U-Boot to use only the 16MB memory, so that this
memory can be reserved. Limit relocation to happen within
16MB memory, start 0xFF00_0000 and end 0x1_0000_0000

Signed-off-by: Bharat Kumar Reddy Gooty <bharat.gooty at broadcom.com>
Signed-off-by: Rayagonda Kokatanur <rayagonda.kokatanur at broadcom.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
Changes from v3:
  -Address review comments from Simon,
   Update the commit message.

 board/broadcom/bcmns3/ns3.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/board/broadcom/bcmns3/ns3.c b/board/broadcom/bcmns3/ns3.c
index 418db67875..33e25376f2 100644
--- a/board/broadcom/bcmns3/ns3.c
+++ b/board/broadcom/bcmns3/ns3.c
@@ -141,6 +141,11 @@ static int mem_info_parse_fixup(void *fdt)
 
 int board_init(void)
 {
+	/* Setup memory using "memory" node from DTB */
+	if (fdtdec_setup_mem_size_base() != 0)
+		return -EINVAL;
+	fdtdec_setup_memory_banksize();
+
 	if (bl33_info->version != BL33_INFO_VERSION)
 		printf("*** warning: ATF BL31 and u-boot not in sync! ***\n");
 
@@ -154,19 +159,30 @@ int board_late_init(void)
 
 int dram_init(void)
 {
-	if (fdtdec_setup_mem_size_base() != 0)
-		return -EINVAL;
+	/*
+	 * Mark ram base as the last 16MB of 2GB DDR, which is 0xFF00_0000.
+	 * So that relocation happens with in the last 16MB memory.
+	 */
+	gd->ram_base = (phys_size_t)(BCM_NS3_MEM_END - SZ_16M);
+	gd->ram_size = (unsigned long)SZ_16M;
 
 	return 0;
 }
 
 int dram_init_banksize(void)
 {
-	fdtdec_setup_memory_banksize();
+	gd->bd->bi_dram[0].start = (BCM_NS3_MEM_END - SZ_16M);
+	gd->bd->bi_dram[0].size = SZ_16M;
 
 	return 0;
 }
 
+/* Limit RAM used by U-Boot to the DDR first bank End region */
+ulong board_get_usable_ram_top(ulong total_size)
+{
+	return BCM_NS3_MEM_END;
+}
+
 void reset_cpu(ulong level)
 {
 #define L3_RESET 30
-- 
2.17.1