Index: head/sys/dev/drm2/radeon/ni.c
===================================================================
--- head/sys/dev/drm2/radeon/ni.c
+++ head/sys/dev/drm2/radeon/ni.c
@@ -182,7 +182,7 @@
 {
 	const __be32 *fw_data;
 	u32 mem_type, running, blackout = 0;
-	u32 *io_mc_regs;
+	const u32 *io_mc_regs;
 	int i, ucode_size, regs_size;
 
 	if (!rdev->mc_fw)
@@ -190,23 +190,23 @@
 
 	switch (rdev->family) {
 	case CHIP_BARTS:
-		io_mc_regs = (u32 *)&barts_io_mc_regs;
+		io_mc_regs = (const u32 *)&barts_io_mc_regs;
 		ucode_size = BTC_MC_UCODE_SIZE;
 		regs_size = BTC_IO_MC_REGS_SIZE;
 		break;
 	case CHIP_TURKS:
-		io_mc_regs = (u32 *)&turks_io_mc_regs;
+		io_mc_regs = (const u32 *)&turks_io_mc_regs;
 		ucode_size = BTC_MC_UCODE_SIZE;
 		regs_size = BTC_IO_MC_REGS_SIZE;
 		break;
 	case CHIP_CAICOS:
 	default:
-		io_mc_regs = (u32 *)&caicos_io_mc_regs;
+		io_mc_regs = (const u32 *)&caicos_io_mc_regs;
 		ucode_size = BTC_MC_UCODE_SIZE;
 		regs_size = BTC_IO_MC_REGS_SIZE;
 		break;
 	case CHIP_CAYMAN:
-		io_mc_regs = (u32 *)&cayman_io_mc_regs;
+		io_mc_regs = (const u32 *)&cayman_io_mc_regs;
 		ucode_size = CAYMAN_MC_UCODE_SIZE;
 		regs_size = BTC_IO_MC_REGS_SIZE;
 		break;
Index: head/sys/dev/drm2/radeon/si.c
===================================================================
--- head/sys/dev/drm2/radeon/si.c
+++ head/sys/dev/drm2/radeon/si.c
@@ -182,7 +182,7 @@
 {
 	const __be32 *fw_data;
 	u32 running, blackout = 0;
-	u32 *io_mc_regs;
+	const u32 *io_mc_regs;
 	int i, ucode_size, regs_size;
 
 	if (!rdev->mc_fw)
@@ -190,18 +190,18 @@
 
 	switch (rdev->family) {
 	case CHIP_TAHITI:
-		io_mc_regs = (u32 *)&tahiti_io_mc_regs;
+		io_mc_regs = (const u32 *)&tahiti_io_mc_regs;
 		ucode_size = SI_MC_UCODE_SIZE;
 		regs_size = TAHITI_IO_MC_REGS_SIZE;
 		break;
 	case CHIP_PITCAIRN:
-		io_mc_regs = (u32 *)&pitcairn_io_mc_regs;
+		io_mc_regs = (const u32 *)&pitcairn_io_mc_regs;
 		ucode_size = SI_MC_UCODE_SIZE;
 		regs_size = TAHITI_IO_MC_REGS_SIZE;
 		break;
 	case CHIP_VERDE:
 	default:
-		io_mc_regs = (u32 *)&verde_io_mc_regs;
+		io_mc_regs = (const u32 *)&verde_io_mc_regs;
 		ucode_size = SI_MC_UCODE_SIZE;
 		regs_size = TAHITI_IO_MC_REGS_SIZE;
 		break;