1 files changed, 28 insertions, 1 deletions

diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 555ec9714b9e..10c24356d2d5 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -57,7 +57,7 @@ config 32BIT
         bool
         default y if CPU_SH5
 
-config PMB
+config PMB_ENABLE
         bool "Support 32-bit physical addressing through PMB"
         depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
         select 32BIT
@@ -67,6 +67,33 @@ config PMB
           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_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7785)
+        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.
+
+config PMB_FIXED
+        bool "fixed PMB"
+        depends on MMU && EXPERIMENTAL && (CPU_SUBTYPE_SH7780 || \
+                                           CPU_SUBTYPE_SH7785)
+        select 32BIT
+        help
+          If this option is enabled, fixed PMB mappings are inherited
+          from the boot loader, and the kernel does not attempt dynamic
+          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