Kconfig option PHYS_64BIT sets the size of phys_addr_t to 64 bits, which
allows support for a 36-bit physical address space. With this option, the
kernel can support more than 2GB of RAM, but the larger address size
impacts performance slightly.
By including "select PHYS_64BIT" in the Kconfig for a particular board,
that option is forced enabled, and it becomes impossible to create a 32-bit
kernel. Instead, we should depend on the defconfig to enable this option.
We still build a 36-bit kernel by default, and we also allow users to build
32-bit kernels if they really want.
Signed-off-by: Timur Tabi <ti...@freescale.com>
---
arch/powerpc/configs/corenet32_smp_defconfig | 1 +
arch/powerpc/platforms/85xx/Kconfig | 5 -----
2 files changed, 1 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/configs/corenet32_smp_defconfig
b/arch/powerpc/configs/corenet32_smp_defconfig
index 4311d02..819c06e 100644
--- a/arch/powerpc/configs/corenet32_smp_defconfig
+++ b/arch/powerpc/configs/corenet32_smp_defconfig
@@ -1,4 +1,5 @@
CONFIG_PPC_85xx=y
+CONFIG_PHYS_64BIT=y
CONFIG_SMP=y
CONFIG_NR_CPUS=8
CONFIG_EXPERIMENTAL=y
diff --git a/arch/powerpc/platforms/85xx/Kconfig
b/arch/powerpc/platforms/85xx/Kconfig
index 12f5932..6dba779 100644
--- a/arch/powerpc/platforms/85xx/Kconfig
+++ b/arch/powerpc/platforms/85xx/Kconfig
@@ -80,7 +80,6 @@ config P1010_RDB
config P1022_DS
bool "Freescale P1022 DS"
select DEFAULT_UIMAGE
- select PHYS_64BIT # The DTS has 36-bit addresses
select SWIOTLB
help
This option enables support for the Freescale P1022DS reference board.
@@ -175,7 +174,6 @@ config P2040_RDB
bool "Freescale P2040 RDB"
select DEFAULT_UIMAGE
select PPC_E500MC
- select PHYS_64BIT
select SWIOTLB
select MPC8xxx_GPIO
select HAS_RAPIDIO
@@ -187,7 +185,6 @@ config P3041_DS
bool "Freescale P3041 DS"
select DEFAULT_UIMAGE
select PPC_E500MC
- select PHYS_64BIT
select SWIOTLB
select MPC8xxx_GPIO
select HAS_RAPIDIO
@@ -199,7 +196,6 @@ config P4080_DS
bool "Freescale P4080 DS"
select DEFAULT_UIMAGE
select PPC_E500MC
- select PHYS_64BIT
select SWIOTLB
select MPC8xxx_GPIO
select HAS_RAPIDIO
@@ -214,7 +210,6 @@ config P5020_DS
select DEFAULT_UIMAGE
select E500
select PPC_E500MC
- select PHYS_64BIT
select SWIOTLB
select MPC8xxx_GPIO
select HAS_RAPIDIO
--
1.7.3.4
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