powerpc83xx/km: lock the window size to 2GiB befor fixing sdram size

If the ram size isn't locked to 2GiB, the get_ram_size() may hang up.
Signed-off-by: NChristian Herzig <christian.herzig@keymile.com>
cc: Kim Phillips <kim.phillips@freescale.com>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Gerlando Falauto <gerlando.falauto@keymile.com>
Signed-off-by: NHolger Brunck <holger.brunck@keymile.com>
Signed-off-by: NKim Phillips <kim.phillips@freescale.com>

board/keymile/km83xx/km83xx.c

@@ -204,7 +204,7 @@ int fixed_sdram(void)
 	u32 ddr_size_log2;
 
 	out_be32(&im->sysconf.ddrlaw[0].ar, (LAWAR_EN | 0x1e));
-	out_be32(&im->ddr.csbnds[0].csbnds, CONFIG_SYS_DDR_CS0_BNDS);
+	out_be32(&im->ddr.csbnds[0].csbnds, (CONFIG_SYS_DDR_CS0_BNDS) | 0x7f);
 	out_be32(&im->ddr.cs_config[0], CONFIG_SYS_DDR_CS0_CONFIG);
 	out_be32(&im->ddr.timing_cfg_0, CONFIG_SYS_DDR_TIMING_0);
 	out_be32(&im->ddr.timing_cfg_1, CONFIG_SYS_DDR_TIMING_1);