driver: net: fsl-mc: Memset MC reserve ram memory before usage

Memory reserved for Management Complex needs to be cleaned before any
usage.

Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha@nxp.com>
[York S: revised commit message]
Reviewed-by: York Sun <york.sun@nxp.com>

drivers/net/fsl-mc/mc.c

@@ -2,6 +2,7 @@
 /*
  * Copyright 2014 Freescale Semiconductor, Inc.
  * Copyright 2017 NXP
+ * Copyright 2017-2018 NXP
  */
 #include <common.h>
 #include <errno.h>
@@ -29,6 +30,7 @@
 #define MC_BOOT_ENV_VAR		"mcinitcmd"
 
 DECLARE_GLOBAL_DATA_PTR;
+static int mc_memset_resv_ram;
 static int mc_boot_status = -1;
 static int mc_dpl_applied = -1;
 #ifdef CONFIG_SYS_LS_MC_DRAM_AIOP_IMG_OFFSET
@@ -844,6 +846,11 @@ u64 mc_get_dram_addr(void)
 {
 	size_t mc_ram_size = mc_get_dram_block_size();
 
+	if (!mc_memset_resv_ram || (get_mc_boot_status() < 0)) {
+		mc_memset_resv_ram = 1;
+		memset((void *)gd->arch.resv_ram, 0, mc_ram_size);
+	}
+
 	return (gd->arch.resv_ram + mc_ram_size - 1) &
 		MC_RAM_BASE_ADDR_ALIGNMENT_MASK;
 }