From 3de00482b006daa110151ac6775adc52538a3d6a Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Sat, 23 Jul 2016 02:47:58 +0300 Subject: 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 --- arch/xtensa/Kconfig | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) (limited to 'arch/xtensa/Kconfig') 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. -- cgit