MIPS: ralink: add memory definition for RT2880

Populate struct soc_info with the data that describes our RAM window.

Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5181/
diff --git a/arch/mips/ralink/rt288x.c b/arch/mips/ralink/rt288x.c
index 1e0788e..f87de1a 100644
--- a/arch/mips/ralink/rt288x.c
+++ b/arch/mips/ralink/rt288x.c
@@ -136,4 +136,8 @@
 		name,
 		(id >> CHIP_ID_ID_SHIFT) & CHIP_ID_ID_MASK,
 		(id & CHIP_ID_REV_MASK));
+
+	soc_info->mem_base = RT2880_SDRAM_BASE;
+	soc_info->mem_size_min = RT2880_MEM_SIZE_MIN;
+	soc_info->mem_size_max = RT2880_MEM_SIZE_MAX;
 }