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-rw-r--r--arch/sh/mm/Kconfig29
1 files changed, 28 insertions, 1 deletions
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 555ec97..10c2435 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
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