Index: linux/arch/powerpc/kernel/setup_32.c
===================================================================
--- linux.orig/arch/powerpc/kernel/setup_32.c	2015-07-12 20:25:11.000000000 +1000
+++ linux/arch/powerpc/kernel/setup_32.c	2015-07-12 20:25:13.000000000 +1000
@@ -170,20 +170,18 @@ __setup("l3cr=", ppc_setup_l3cr);
 
 #ifdef CONFIG_GENERIC_NVRAM
 
-unsigned char nvram_read_byte(int addr)
+static unsigned char ppc_nvram_read_byte(int addr)
 {
 	if (ppc_md.nvram_read_val)
 		return ppc_md.nvram_read_val(addr);
 	return 0xff;
 }
-EXPORT_SYMBOL(nvram_read_byte);
 
-void nvram_write_byte(unsigned char val, int addr)
+static void ppc_nvram_write_byte(unsigned char val, int addr)
 {
 	if (ppc_md.nvram_write_val)
 		ppc_md.nvram_write_val(addr, val);
 }
-EXPORT_SYMBOL(nvram_write_byte);
 
 static ssize_t ppc_nvram_get_size(void)
 {
@@ -200,6 +198,8 @@ static long ppc_nvram_sync(void)
 }
 
 const struct nvram_ops arch_nvram_ops = {
+	.read_byte      = ppc_nvram_read_byte,
+	.write_byte     = ppc_nvram_write_byte,
 	.get_size       = ppc_nvram_get_size,
 	.sync           = ppc_nvram_sync,
 };
Index: linux/drivers/char/generic_nvram.c
===================================================================
--- linux.orig/drivers/char/generic_nvram.c	2015-07-12 20:25:11.000000000 +1000
+++ linux/drivers/char/generic_nvram.c	2015-07-12 20:25:13.000000000 +1000
@@ -64,7 +64,7 @@ static ssize_t read_nvram(struct file *f
 	if (*ppos >= nvram_len)
 		return 0;
 	for (i = *ppos; count > 0 && i < nvram_len; ++i, ++p, --count)
-		if (__put_user(nvram_read_byte(i), p))
+		if (__put_user(arch_nvram_ops.read_byte(i), p))
 			return -EFAULT;
 	*ppos = i;
 	return p - buf;
@@ -84,7 +84,7 @@ static ssize_t write_nvram(struct file *
 	for (i = *ppos; count > 0 && i < nvram_len; ++i, ++p, --count) {
 		if (__get_user(c, p))
 			return -EFAULT;
-		nvram_write_byte(c, i);
+		arch_nvram_ops.write_byte(c, i);
 	}
 	*ppos = i;
 	return p - buf;
Index: linux/drivers/video/fbdev/controlfb.c
===================================================================
--- linux.orig/drivers/video/fbdev/controlfb.c	2015-07-12 20:24:53.000000000 +1000
+++ linux/drivers/video/fbdev/controlfb.c	2015-07-12 20:25:13.000000000 +1000
@@ -415,7 +415,7 @@ static int __init init_control(struct fb
 	/* Try to pick a video mode out of NVRAM if we have one. */
 #ifdef CONFIG_NVRAM
 	if (default_cmode == CMODE_NVRAM) {
-		cmode = nvram_read_byte(NV_CMODE);
+		cmode = arch_nvram_ops.read_byte(NV_CMODE);
 		if(cmode < CMODE_8 || cmode > CMODE_32)
 			cmode = CMODE_8;
 	} else
@@ -423,7 +423,7 @@ static int __init init_control(struct fb
 		cmode=default_cmode;
 #ifdef CONFIG_NVRAM
 	if (default_vmode == VMODE_NVRAM) {
-		vmode = nvram_read_byte(NV_VMODE);
+		vmode = arch_nvram_ops.read_byte(NV_VMODE);
 		if (vmode < 1 || vmode > VMODE_MAX ||
 		    control_mac_modes[vmode - 1].m[full] < cmode) {
 			sense = read_control_sense(p);
Index: linux/drivers/video/fbdev/matrox/matroxfb_base.c
===================================================================
--- linux.orig/drivers/video/fbdev/matrox/matroxfb_base.c	2015-07-12 20:25:08.000000000 +1000
+++ linux/drivers/video/fbdev/matrox/matroxfb_base.c	2015-07-12 20:25:13.000000000 +1000
@@ -1888,7 +1888,7 @@ static int initMatrox2(struct matrox_fb_
 			default_vmode = VMODE_640_480_60;
 #ifdef CONFIG_NVRAM
 		if (default_cmode == CMODE_NVRAM)
-			default_cmode = nvram_read_byte(NV_CMODE);
+			default_cmode = arch_nvram_ops.read_byte(NV_CMODE);
 #endif
 		if (default_cmode < CMODE_8 || default_cmode > CMODE_32)
 			default_cmode = CMODE_8;
Index: linux/drivers/video/fbdev/platinumfb.c
===================================================================
--- linux.orig/drivers/video/fbdev/platinumfb.c	2015-07-12 20:24:53.000000000 +1000
+++ linux/drivers/video/fbdev/platinumfb.c	2015-07-12 20:25:13.000000000 +1000
@@ -349,7 +349,7 @@ static int platinum_init_fb(struct fb_in
 	printk(KERN_INFO "platinumfb: Monitor sense value = 0x%x, ", sense);
 	if (default_vmode == VMODE_NVRAM) {
 #ifdef CONFIG_NVRAM
-		default_vmode = nvram_read_byte(NV_VMODE);
+		default_vmode = arch_nvram_ops.read_byte(NV_VMODE);
 		if (default_vmode <= 0 || default_vmode > VMODE_MAX ||
 		    !platinum_reg_init[default_vmode-1])
 #endif
@@ -362,7 +362,7 @@ static int platinum_init_fb(struct fb_in
 		default_vmode = VMODE_640_480_60;
 #ifdef CONFIG_NVRAM
 	if (default_cmode == CMODE_NVRAM)
-		default_cmode = nvram_read_byte(NV_CMODE);
+		default_cmode = arch_nvram_ops.read_byte(NV_CMODE);
 #endif
 	if (default_cmode < CMODE_8 || default_cmode > CMODE_32)
 		default_cmode = CMODE_8;
Index: linux/drivers/video/fbdev/valkyriefb.c
===================================================================
--- linux.orig/drivers/video/fbdev/valkyriefb.c	2015-07-12 20:24:53.000000000 +1000
+++ linux/drivers/video/fbdev/valkyriefb.c	2015-07-12 20:25:13.000000000 +1000
@@ -287,7 +287,7 @@ static void __init valkyrie_choose_mode(
 	/* Try to pick a video mode out of NVRAM if we have one. */
 #if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
 	if (default_vmode == VMODE_NVRAM) {
-		default_vmode = nvram_read_byte(NV_VMODE);
+		default_vmode = arch_nvram_ops.read_byte(NV_VMODE);
 		if (default_vmode <= 0
 		 || default_vmode > VMODE_MAX
 		 || !valkyrie_reg_init[default_vmode - 1])
@@ -300,7 +300,7 @@ static void __init valkyrie_choose_mode(
 		default_vmode = VMODE_640_480_67;
 #if !defined(CONFIG_MAC) && defined(CONFIG_NVRAM)
 	if (default_cmode == CMODE_NVRAM)
-		default_cmode = nvram_read_byte(NV_CMODE);
+		default_cmode = arch_nvram_ops.read_byte(NV_CMODE);
 #endif
 
 	/*
Index: linux/drivers/video/fbdev/imsttfb.c
===================================================================
--- linux.orig/drivers/video/fbdev/imsttfb.c	2015-07-12 20:24:53.000000000 +1000
+++ linux/drivers/video/fbdev/imsttfb.c	2015-07-12 20:25:13.000000000 +1000
@@ -328,7 +328,6 @@ enum {
 	TVP = 1
 };
 
-#define USE_NV_MODES		1
 #define INIT_BPP		8
 #define INIT_XRES		640
 #define INIT_YRES		480
@@ -1391,17 +1390,17 @@ static void init_imstt(struct fb_info *i
 		}
 	}
 
-#if USE_NV_MODES && defined(CONFIG_PPC32)
+#if defined(CONFIG_NVRAM) && defined(CONFIG_PPC32)
 	{
 		int vmode = init_vmode, cmode = init_cmode;
 
 		if (vmode == -1) {
-			vmode = nvram_read_byte(NV_VMODE);
+			vmode = arch_nvram_ops.read_byte(NV_VMODE);
 			if (vmode <= 0 || vmode > VMODE_MAX)
 				vmode = VMODE_640_480_67;
 		}
 		if (cmode == -1) {
-			cmode = nvram_read_byte(NV_CMODE);
+			cmode = arch_nvram_ops.read_byte(NV_CMODE);
 			if (cmode < CMODE_8 || cmode > CMODE_32)
 				cmode = CMODE_8;
 		}
