diff --git a/arch/sh/boot/Makefile b/arch/sh/boot/Makefile
index 743ce0c..1ce6362 100644
--- a/arch/sh/boot/Makefile
+++ b/arch/sh/boot/Makefile
@@ -46,15 +46,8 @@
 $(obj)/romimage/vmlinux: $(obj)/zImage FORCE
 	$(Q)$(MAKE) $(build)=$(obj)/romimage $@
 
-KERNEL_MEMORY := 0x00000000
-ifeq ($(CONFIG_PMB_FIXED),y)
-KERNEL_MEMORY := $(shell /bin/bash -c 'printf "0x%08x" \
+KERNEL_MEMORY	:= $(shell /bin/bash -c 'printf "0x%08x" \
 		     $$[$(CONFIG_MEMORY_START) & 0x1fffffff]')
-endif
-ifeq ($(CONFIG_29BIT),y)
-KERNEL_MEMORY := $(shell /bin/bash -c 'printf "0x%08x" \
-		     $$[$(CONFIG_MEMORY_START)]')
-endif
 
 KERNEL_LOAD	:= $(shell /bin/bash -c 'printf "0x%08x" \
 		     $$[$(CONFIG_PAGE_OFFSET)  + \
diff --git a/arch/sh/include/asm/addrspace.h b/arch/sh/include/asm/addrspace.h
index 99d6b3e..bcd7d4d 100644
--- a/arch/sh/include/asm/addrspace.h
+++ b/arch/sh/include/asm/addrspace.h
@@ -28,7 +28,7 @@
 /* Returns the privileged segment base of a given address  */
 #define PXSEG(a)	(((unsigned long)(a)) & 0xe0000000)
 
-#if defined(CONFIG_29BIT) || defined(CONFIG_PMB_FIXED)
+#ifdef CONFIG_29BIT
 /*
  * Map an address to a certain privileged segment
  */
@@ -40,7 +40,7 @@
 	((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P3SEG))
 #define P4SEGADDR(a)	\
 	((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | P4SEG))
-#endif /* 29BIT || PMB_FIXED */
+#endif /* 29BIT */
 #endif /* P1SEG */
 
 /* Check if an address can be reached in 29 bits */
diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index 026dd65..f4314d8 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -244,18 +244,11 @@
 }
 
 static inline void __iomem *
-__ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
+__ioremap_29bit(unsigned long offset, unsigned long size, unsigned long flags)
 {
-#if defined(CONFIG_SUPERH32) && !defined(CONFIG_PMB_FIXED) && !defined(CONFIG_PMB)
+#ifdef CONFIG_29BIT
 	unsigned long last_addr = offset + size - 1;
-#endif
-	void __iomem *ret;
 
-	ret = __ioremap_trapped(offset, size);
-	if (ret)
-		return ret;
-
-#if defined(CONFIG_SUPERH32) && !defined(CONFIG_PMB_FIXED) && !defined(CONFIG_PMB)
 	/*
 	 * For P1 and P2 space this is trivial, as everything is already
 	 * mapped. Uncached access for P1 addresses are done through P2.
@@ -274,6 +267,22 @@
 		return (void __iomem *)P4SEGADDR(offset);
 #endif
 
+	return NULL;
+}
+
+static inline void __iomem *
+__ioremap_mode(unsigned long offset, unsigned long size, unsigned long flags)
+{
+	void __iomem *ret;
+
+	ret = __ioremap_trapped(offset, size);
+	if (ret)
+		return ret;
+
+	ret = __ioremap_29bit(offset, size, flags);
+	if (ret)
+		return ret;
+
 	return __ioremap(offset, size, flags);
 }
 #else
diff --git a/arch/sh/include/asm/mmu.h b/arch/sh/include/asm/mmu.h
index c7426ad..4b0882b 100644
--- a/arch/sh/include/asm/mmu.h
+++ b/arch/sh/include/asm/mmu.h
@@ -65,11 +65,29 @@
 	struct pmb_entry *link;
 };
 
+#ifdef CONFIG_PMB
 /* arch/sh/mm/pmb.c */
 long pmb_remap(unsigned long virt, unsigned long phys,
 	       unsigned long size, unsigned long flags);
 void pmb_unmap(unsigned long addr);
 int pmb_init(void);
+#else
+static inline long pmb_remap(unsigned long virt, unsigned long phys,
+			     unsigned long size, unsigned long flags)
+{
+	return -EINVAL
+}
+
+static inline void pmb_unmap(unsigned long addr)
+{
+}
+
+static inline int pmb_init(void)
+{
+	return -ENODEV;
+}
+#endif /* CONFIG_PMB */
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __MMU_H */
diff --git a/arch/sh/include/asm/page.h b/arch/sh/include/asm/page.h
index 81bffc0..a86c0f1 100644
--- a/arch/sh/include/asm/page.h
+++ b/arch/sh/include/asm/page.h
@@ -127,7 +127,7 @@
  * is not visible (it is part of the PMB mapping) and so needs to be
  * added or subtracted as required.
  */
-#if defined(CONFIG_PMB_FIXED)
+#if defined(CONFIG_PMB_LEGACY)
 /* phys = virt - PAGE_OFFSET - (__MEMORY_START & 0xe0000000) */
 #define PMB_OFFSET	(PAGE_OFFSET - PXSEG(__MEMORY_START))
 #define __pa(x)	((unsigned long)(x) - PMB_OFFSET)
diff --git a/arch/sh/kernel/head_32.S b/arch/sh/kernel/head_32.S
index 1151ecd..e5d421db 100644
--- a/arch/sh/kernel/head_32.S
+++ b/arch/sh/kernel/head_32.S
@@ -13,6 +13,8 @@
 #include <linux/init.h>
 #include <linux/linkage.h>
 #include <asm/thread_info.h>
+#include <asm/mmu.h>
+#include <cpu/mmu_context.h>
 
 #ifdef CONFIG_CPU_SH4A
 #define SYNCO()		synco
@@ -33,7 +35,7 @@
 	.long	1		/* LOADER_TYPE */
 	.long	0x00000000	/* INITRD_START */
 	.long	0x00000000	/* INITRD_SIZE */
-#if defined(CONFIG_32BIT) && defined(CONFIG_PMB_FIXED)
+#ifdef CONFIG_32BIT
 	.long	0x53453f00 + 32	/* "SE?" = 32 bit */
 #else
 	.long	0x53453f00 + 29	/* "SE?" = 29 bit */
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 8b0e697..f79ebe3 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -455,10 +455,7 @@
 		sh_mv.mv_setup(cmdline_p);
 
 	paging_init();
-
-#ifdef CONFIG_PMB_ENABLE
 	pmb_init();
-#endif
 
 #ifdef CONFIG_SMP
 	plat_smp_setup();
diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S
index a1e4ec2..9e5a587 100644
--- a/arch/sh/kernel/vmlinux.lds.S
+++ b/arch/sh/kernel/vmlinux.lds.S
@@ -14,17 +14,16 @@
 #include <asm/cache.h>
 #include <asm/vmlinux.lds.h>
 
+#if defined(CONFIG_32BIT) && !defined(CONFIG_PMB_LEGACY)
+#define MEMORY_OFFSET	0
+#else
+#define MEMORY_OFFSET	(CONFIG_MEMORY_START & 0x1fffffff)
+#endif
+
 ENTRY(_start)
 SECTIONS
 {
-#ifdef CONFIG_PMB_FIXED
-	. = CONFIG_PAGE_OFFSET + (CONFIG_MEMORY_START & 0x1fffffff) +
-	    CONFIG_ZERO_PAGE_OFFSET;
-#elif defined(CONFIG_32BIT)
-	. = CONFIG_PAGE_OFFSET + CONFIG_ZERO_PAGE_OFFSET;
-#else
-	. = CONFIG_PAGE_OFFSET + CONFIG_MEMORY_START + CONFIG_ZERO_PAGE_OFFSET;
-#endif
+	. = CONFIG_PAGE_OFFSET + MEMORY_OFFSET + CONFIG_ZERO_PAGE_OFFSET;
 
 	_text = .;		/* Text and read-only data */
 
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 358c860..860cd24 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -80,30 +80,18 @@
 	bool
 	default y if CPU_SH5
 
-config PMB_ENABLE
+config PMB
 	bool "Support 32-bit physical addressing through PMB"
 	depends on MMU && EXPERIMENTAL && CPU_SH4A && !CPU_SH4AL_DSP
+	select 32BIT
 	help
 	  If you say Y here, physical addressing will be extended to
 	  32-bits through the SH-4A PMB. If this is not set, legacy
 	  29-bit physical addressing will be used.
 
-choice
-	prompt "PMB handling type"
-	depends on PMB_ENABLE
-	default PMB_FIXED
-
-config PMB
-	bool "PMB"
-	depends on MMU && EXPERIMENTAL && CPU_SH4A && !CPU_SH4AL_DSP
-	help
-	  If you say Y here, physical addressing will be extended to
-	  32-bits through the SH-4A PMB. If this is not set, legacy
-	  29-bit physical addressing will be used.
-
-config PMB_FIXED
-	bool "fixed PMB"
-	depends on MMU && EXPERIMENTAL && CPU_SH4A && !CPU_SH4AL_DSP
+config PMB_LEGACY
+	bool "Support legacy boot mappings for PMB"
+	depends on PMB
 	select 32BIT
 	help
 	  If this option is enabled, fixed PMB mappings are inherited
@@ -111,8 +99,6 @@
 	  management. This is the closest to legacy 29-bit physical mode,
 	  and allows systems to support up to 512MiB of system memory.
 
-endchoice
-
 config X2TLB
 	bool "Enable extended TLB mode"
 	depends on (CPU_SHX2 || CPU_SHX3) && MMU && EXPERIMENTAL
diff --git a/arch/sh/mm/Makefile b/arch/sh/mm/Makefile
index 9fa11d6..edde8bd 100644
--- a/arch/sh/mm/Makefile
+++ b/arch/sh/mm/Makefile
@@ -33,7 +33,7 @@
 endif
 
 obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
-obj-$(CONFIG_PMB_ENABLE)	+= pmb.o
+obj-$(CONFIG_PMB)		+= pmb.o
 obj-$(CONFIG_NUMA)		+= numa.o
 
 # Special flags for fault_64.o.  This puts restrictions on the number of
diff --git a/arch/sh/mm/pmb.c b/arch/sh/mm/pmb.c
index 280f6a1..8f7dbf1 100644
--- a/arch/sh/mm/pmb.c
+++ b/arch/sh/mm/pmb.c
@@ -3,7 +3,7 @@
  *
  * Privileged Space Mapping Buffer (PMB) Support.
  *
- * Copyright (C) 2005, 2006, 2007 Paul Mundt
+ * Copyright (C) 2005 - 2010 Paul Mundt
  *
  * P1/P2 Section mapping definitions from map32.h, which was:
  *
@@ -279,51 +279,12 @@
 	} while (pmbe);
 }
 
-#ifdef CONFIG_PMB
-int __uses_jump_to_uncached pmb_init(void)
-{
-	unsigned int i;
-	long size, ret;
-
-	jump_to_uncached();
-
-	/*
-	 * Insert PMB entries for the P1 and P2 areas so that, after
-	 * we've switched the MMU to 32-bit mode, the semantics of P1
-	 * and P2 are the same as in 29-bit mode, e.g.
-	 *
-	 *	P1 - provides a cached window onto physical memory
-	 *	P2 - provides an uncached window onto physical memory
-	 */
-	size = __MEMORY_START + __MEMORY_SIZE;
-
-	ret = pmb_remap(P1SEG, 0x00000000, size, PMB_C);
-	BUG_ON(ret != size);
-
-	ret = pmb_remap(P2SEG, 0x00000000, size, PMB_WT | PMB_UB);
-	BUG_ON(ret != size);
-
-	ctrl_outl(0, PMB_IRMCR);
-
-	/* PMB.SE and UB[7] */
-	ctrl_outl(PASCR_SE | (1 << 7), PMB_PASCR);
-
-	/* Flush out the TLB */
-	i =  ctrl_inl(MMUCR);
-	i |= MMUCR_TI;
-	ctrl_outl(i, MMUCR);
-
-	back_to_cached();
-
-	return 0;
-}
-#else
-int __uses_jump_to_uncached pmb_init(void)
+#ifdef CONFIG_PMB_LEGACY
+static int pmb_apply_legacy_mappings(void)
 {
 	int i;
 	unsigned long addr, data;
-
-	jump_to_uncached();
+	unsigned int applied = 0;
 
 	for (i = 0; i < PMB_ENTRY_MAX; i++) {
 		struct pmb_entry *pmbe;
@@ -357,13 +318,69 @@
 
 		pmbe = pmb_alloc(vpn, ppn, flags, i);
 		WARN_ON(IS_ERR(pmbe));
+
+		applied++;
 	}
 
+	return (applied == 0);
+}
+#else
+static inline int pmb_apply_legacy_mappings(void)
+{
+	return 1;
+}
+#endif
+
+int __uses_jump_to_uncached pmb_init(void)
+{
+	unsigned int i;
+	unsigned long size, ret;
+
+	jump_to_uncached();
+
+	/*
+	 * Attempt to apply the legacy boot mappings if configured. If
+	 * this is successful then we simply carry on with those and
+	 * don't bother establishing additional memory mappings. Dynamic
+	 * device mappings through pmb_remap() can still be bolted on
+	 * after this.
+	 */
+	ret = pmb_apply_legacy_mappings();
+	if (ret == 0) {
+		back_to_cached();
+		return 0;
+	}
+
+	/*
+	 * Insert PMB entries for the P1 and P2 areas so that, after
+	 * we've switched the MMU to 32-bit mode, the semantics of P1
+	 * and P2 are the same as in 29-bit mode, e.g.
+	 *
+	 *	P1 - provides a cached window onto physical memory
+	 *	P2 - provides an uncached window onto physical memory
+	 */
+	size = (unsigned long)__MEMORY_START + __MEMORY_SIZE;
+
+	ret = pmb_remap(P1SEG, 0x00000000, size, PMB_C);
+	BUG_ON(ret != size);
+
+	ret = pmb_remap(P2SEG, 0x00000000, size, PMB_WT | PMB_UB);
+	BUG_ON(ret != size);
+
+	ctrl_outl(0, PMB_IRMCR);
+
+	/* PMB.SE and UB[7] */
+	ctrl_outl(PASCR_SE | (1 << 7), PMB_PASCR);
+
+	/* Flush out the TLB */
+	i =  ctrl_inl(MMUCR);
+	i |= MMUCR_TI;
+	ctrl_outl(i, MMUCR);
+
 	back_to_cached();
 
 	return 0;
 }
-#endif /* CONFIG_PMB */
 
 static int pmb_seq_show(struct seq_file *file, void *iter)
 {
@@ -462,6 +479,5 @@
 {
 	return sysdev_driver_register(&cpu_sysdev_class, &pmb_sysdev_driver);
 }
-
 subsys_initcall(pmb_sysdev_init);
 #endif