diff --git a/arch/mips/mips-boards/generic/memory.c b/arch/mips/mips-boards/generic/memory.c
index c89fcf9e9c22f51fd88c74e3a0f941a441edc168..be80c5dd4a0c2861dd058984f35d9787dd75cb57 100644
--- a/arch/mips/mips-boards/generic/memory.c
+++ b/arch/mips/mips-boards/generic/memory.c
@@ -47,43 +47,45 @@ static char *mtypes[3] = {
 };
 #endif
 
+/* determined physical memory size, not overridden by command line args  */
+unsigned long physical_memsize = 0L;
+
 struct prom_pmemblock * __init prom_getmdesc(void)
 {
 	char *memsize_str;
 	unsigned int memsize;
 	char cmdline[CL_SIZE], *ptr;
 
-	/* Check the command line first for a memsize directive */
-	strcpy(cmdline, arcs_cmdline);
-	ptr = strstr(cmdline, "memsize=");
-	if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
-		ptr = strstr(ptr, " memsize=");
-
-	if (ptr) {
-		memsize = memparse(ptr + 8, &ptr);
-	}
-	else {
-		/* otherwise look in the environment */
-		memsize_str = prom_getenv("memsize");
-		if (!memsize_str) {
-			prom_printf("memsize not set in boot prom, set to default (32Mb)\n");
-			memsize = 0x02000000;
-		} else {
+	/* otherwise look in the environment */
+	memsize_str = prom_getenv("memsize");
+	if (!memsize_str) {
+		prom_printf("memsize not set in boot prom, set to default (32Mb)\n");
+		physical_memsize = 0x02000000;
+	} else {
 #ifdef DEBUG
-			prom_printf("prom_memsize = %s\n", memsize_str);
+		prom_printf("prom_memsize = %s\n", memsize_str);
 #endif
-			memsize = simple_strtol(memsize_str, NULL, 0);
-		}
+		physical_memsize = simple_strtol(memsize_str, NULL, 0);
 	}
 
 #ifdef CONFIG_CPU_BIG_ENDIAN
-	/*
-	 * SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
-	 * word of physical memory
-	 */
-	memsize -= PAGE_SIZE;
+	/* SOC-it swaps, or perhaps doesn't swap, when DMA'ing the last
+	   word of physical memory */
+	physical_memsize -= PAGE_SIZE;
 #endif
 
+	/* Check the command line for a memsize directive that overrides
+	   the physical/default amount */
+	strcpy(cmdline, arcs_cmdline);
+	ptr = strstr(cmdline, "memsize=");
+	if (ptr && (ptr != cmdline) && (*(ptr - 1) != ' '))
+		ptr = strstr(ptr, " memsize=");
+
+	if (ptr)
+		memsize = memparse(ptr + 8, &ptr);
+	else
+		memsize = physical_memsize;
+
 	memset(mdesc, 0, sizeof(mdesc));
 
 	mdesc[0].type = yamon_dontuse;