diff options
Diffstat (limited to 'arch/microblaze/Kconfig')
| -rw-r--r-- | arch/microblaze/Kconfig | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index 3267cc5065d5..86ae27871f41 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -159,20 +159,18 @@ config XILINX_UNCACHED_SHADOW The feature requires the design to define the RAM memory controller window to be twice as large as the actual physical memory. -config HIGHMEM_START_BOOL - bool "Set high memory pool address" - depends on ADVANCED_OPTIONS && HIGHMEM - help - This option allows you to set the base address of the kernel virtual - area used to map high memory pages. This can be useful in - optimizing the layout of kernel virtual memory. - - Say N here unless you know what you are doing. - -config HIGHMEM_START - hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL +config HIGHMEM + bool "High memory support" depends on MMU - default "0xfe000000" + help + The address space of Microblaze processors is only 4 Gigabytes large + and it has to accommodate user address space, kernel address + space as well as some memory mapped IO. That means that, if you + have a large amount of physical memory and/or IO, not all of the + memory can be "permanently mapped" by the kernel. The physical + memory that is not permanently mapped is called "high memory". + + If unsure, say n. config LOWMEM_SIZE_BOOL bool "Set maximum low memory" |