[U-Boot] [PATCH 5/5] sunxi: restrict the ram_size to the accessible range in SPL

[Icenowy Zheng]

On newer Allwinner SoCs with the BROM start at 0x0 and the DRAM space at
<0x40000000 0xc0000000>, some parts of DRAM will be inaccessible when
4GiB module is used.

Restrict the ram_size written to global_data in SPL.

Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
---
 board/sunxi/board.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/board/sunxi/board.c b/board/sunxi/board.c
index 5828d47294..a6620f260a 100644
--- a/board/sunxi/board.c
+++ b/board/sunxi/board.c
@@ -541,6 +541,7 @@ int board_mmc_init(bd_t *bis)
 void sunxi_board_init(void)
 {
 	int power_failed = 0;
+	unsigned long long dram_real_size;
 
 #ifdef CONFIG_SY8106A_POWER
 	power_failed = sy8106a_set_vout1(CONFIG_SY8106A_VOUT1_VOLT);
@@ -601,8 +602,16 @@ void sunxi_board_init(void)
 #endif
 #endif
 	printf("DRAM:");
-	gd->ram_size = (phys_size_t)sunxi_dram_init();
-	printf(" %d MiB\n", (int)(gd->ram_size >> 20));
+	dram_real_size = sunxi_dram_init();
+	printf(" %d MiB", (int)(dram_real_size >> 20));
+	if (dram_real_size > CONFIG_SUNXI_DRAM_MAX_SIZE) {
+		gd->ram_size = CONFIG_SUNXI_DRAM_MAX_SIZE;
+		printf(", %d MiB usable\n", (int)(gd->ram_size >> 20));
+	} else {
+		gd->ram_size = (phys_size_t) dram_real_size;
+		printf("\n");
+	}
+
 	if (!gd->ram_size)
 		hang();
 
-- 
2.15.1