mpc83xx: mpc8360emds: Don't use LBC SDRAM when DDR is available

Since commit 5c2ff323 ("mpc8360emds:
rework LBC SDRAM setup"), LBC SDRAM is available for use in Linux.

Though, it appears that QE Ethernet in Gigabit mode can't transmit
large packets when it tries to work with a data in LBC SDRAM (memtest
didn't discover any issues, is LBC SDRAM just too slow?).

With this patch we can still use the board without DDR memory, but
if DDR is available, we don't use LBC SDRAM.
Signed-off-by: NAnton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: NKim Phillips <kim.phillips@freescale.com>

board/freescale/mpc8360emds/mpc8360emds.c

@@ -126,6 +126,7 @@ phys_size_t initdram(int board_type)
 {
 	volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
 	u32 msize = 0;
+	u32 lbc_sdram_size;
 
 	if ((im->sysconf.immrbar & IMMRBAR_BASE_ADDR) != (u32) im)
 		return -1;
@@ -147,7 +148,9 @@ phys_size_t initdram(int board_type)
 	/*
 	 * Initialize SDRAM if it is on local bus.
 	 */
-	msize += sdram_init(msize * 1024 * 1024);
+	lbc_sdram_size = sdram_init(msize * 1024 * 1024);
+	if (!msize)
+		msize = lbc_sdram_size;
 
 	/* return total bus SDRAM size(bytes)  -- DDR */
 	return (msize * 1024 * 1024);