samsung: tizen_rpi: add swiotlb value to 8192 on 32bit

When 32bit kernel is booting, kernel is reserving memory for SWIOTLB about
64MB. It seems that doesn't need to use full size.
After set 'swiotlb=8192', SWIOTLB is reserved to 16MB.
Then it can save 48MB memory to use ZONE_DMA.

Change-Id: I1a1659cbff2120da755b14f1b373715bc10027c4
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>

diff --git a/include/samsung/tizen_rpi.h b/include/samsung/tizen_rpi.h
index 268fbe8..05b7985 100644 (file)
--- a/include/samsung/tizen_rpi.h
+++ b/include/samsung/tizen_rpi.h
@@ -36,7 +36,7 @@
 #define CONFIG_SET_DFU_ALT_BUF_LEN     (SZ_1K)
 
 #ifdef CONFIG_TARGET_RPI_4_32B
-#define TIZEN_VC_MEM "vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 "
+#define TIZEN_VC_MEM "vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 swiotlb=8192 "
 #else
 #define TIZEN_VC_MEM "vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 "
 #endif