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authorMax Filippov <jcmvbkbc@gmail.com>2016-07-23 02:47:58 +0300
committerMax Filippov <jcmvbkbc@gmail.com>2016-07-24 06:33:59 +0300
commit3de00482b006daa110151ac6775adc52538a3d6a (patch)
treebd7a17e41872fdd386b5f548af88ee626fcdaba6 /arch/xtensa/Kconfig
parenta9f2fc628e3a26a829fd79aff74eb49839d1e74b (diff)
downloadlinux-3de00482b006daa110151ac6775adc52538a3d6a.tar.bz2
xtensa: minimize use of PLATFORM_DEFAULT_MEM_{ADDR,SIZE}
Now that the kernel load address and KSEG physical base address have their own Kconfig symbols PLATFORM_DEFAULT_MEM seems redundant. It makes little sense to use it in MMU configurations instead of KSEG_PADDR. In noMMU configurations there's no explicit KSEG, so it's still useful for the early cache initialization and definition of ARCH_PFN_OFFSET, which affects mem_map size. - limit it to noMMU; MMU variants have XCHAL_KSEG_PADDR and XCHAL_KSEG_SIZE; - don't use it to define TASK_SIZE or MAX_LOW_PFN: first doesn't make any difference in noMMU, second is meaningless as there's no high memory; - don't add default physical memory region: memory layout should come from the DT, bootloader tags, or memmap= command line parameter. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/Kconfig')
-rw-r--r--arch/xtensa/Kconfig18
1 files changed, 7 insertions, 11 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 9b1f8c3c8cba..7a4c77b39ce0 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -394,7 +394,7 @@ config XTENSA_PLATFORM_XT2000
config XTENSA_PLATFORM_XTFPGA
bool "XTFPGA"
select ETHOC if ETHERNET
- select PLATFORM_WANT_DEFAULT_MEM
+ select PLATFORM_WANT_DEFAULT_MEM if !MMU
select SERIAL_CONSOLE
select XTENSA_CALIBRATE_CCOUNT
help
@@ -502,11 +502,9 @@ config DEFAULT_MEM_START
default 0x00000000 if MMU
default 0x60000000 if !MMU
help
- This is a fallback start address of the default memory area, it is
- used when no physical memory size is passed through DTB or through
- boot parameter from bootloader.
-
- It's also used for TASK_SIZE calculation in noMMU configuration.
+ This is the base address of the default memory area.
+ Default memory area has platform-specific meaning, it may be used
+ for e.g. early cache initialization.
If unsure, leave the default value here.
@@ -515,11 +513,9 @@ config DEFAULT_MEM_SIZE
depends on PLATFORM_WANT_DEFAULT_MEM
default 0x04000000
help
- This is a fallback size of the default memory area, it is used when
- no physical memory size is passed through DTB or through boot
- parameter from bootloader.
-
- It's also used for TASK_SIZE calculation in noMMU configuration.
+ This is the size of the default memory area.
+ Default memory area has platform-specific meaning, it may be used
+ for e.g. early cache initialization.
If unsure, leave the default value here.