diff options
Diffstat (limited to 'arch/m68k/Kconfig.cpu')
| -rw-r--r-- | arch/m68k/Kconfig.cpu | 70 |
1 files changed, 46 insertions, 24 deletions
diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu index 9380f6e3bb66..c9a7e602d8a4 100644 --- a/arch/m68k/Kconfig.cpu +++ b/arch/m68k/Kconfig.cpu @@ -2,7 +2,7 @@ comment "Processor Type" choice - prompt "CPU family support" + prompt "CPU/machine family support" default M68KCLASSIC if MMU default COLDFIRE if !MMU help @@ -19,26 +19,37 @@ choice processor, select COLDFIRE. config M68KCLASSIC - bool "Classic M68K CPU family support" + bool "Classic M68K CPU/machine family support" select HAVE_ARCH_PFN_VALID + select M68020 if MMU && !(M68030 || M68040 || M68060) config COLDFIRE bool "Coldfire CPU family support" - select ARCH_HAVE_CUSTOM_GPIO_H select CPU_HAS_NO_BITFIELDS select CPU_HAS_NO_CAS select CPU_HAS_NO_MULDIV64 select GENERIC_CSUM select GPIOLIB select HAVE_LEGACY_CLK + select HAVE_PAGE_SIZE_8KB if !MMU -endchoice +config SUN3 + bool "Sun3 machine support" + depends on MMU + select HAVE_ARCH_PFN_VALID + select LEGACY_TIMER_TICK + select NO_DMA + select M68020 + help + This option enables support for the Sun 3 series of workstations + (3/50, 3/60, 3/1xx, 3/2xx systems). These use a classic 68020 CPU + but the custom memory management unit makes them incompatible with + all other classic m68k machines, including Sun 3x. -if M68KCLASSIC +endchoice config M68000 - def_bool y - depends on !MMU + def_bool M68KCLASSIC && !MMU select CPU_HAS_NO_BITFIELDS select CPU_HAS_NO_CAS select CPU_HAS_NO_MULDIV64 @@ -46,6 +57,7 @@ config M68000 select GENERIC_CSUM select CPU_NO_EFFICIENT_FFS select HAVE_ARCH_HASH + select HAVE_PAGE_SIZE_4KB select LEGACY_TIMER_TICK help The Freescale (was Motorola) 68000 CPU is the first generation of @@ -55,7 +67,7 @@ config M68000 a paging MMU. config M68020 - bool "68020 support" + bool "68020 support" if M68KCLASSIC depends on MMU select FPU select CPU_HAS_ADDRESS_SPACES @@ -65,9 +77,10 @@ config M68020 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the Sun 3, which provides its own version. +if M68KCLASSIC && MMU + config M68030 bool "68030 support" - depends on MMU && !MMU_SUN3 select FPU select CPU_HAS_ADDRESS_SPACES help @@ -77,7 +90,6 @@ config M68030 config M68040 bool "68040 support" - depends on MMU && !MMU_SUN3 select FPU select CPU_HAS_ADDRESS_SPACES help @@ -88,13 +100,14 @@ config M68040 config M68060 bool "68060 support" - depends on MMU && !MMU_SUN3 select FPU select CPU_HAS_ADDRESS_SPACES help If you anticipate running this kernel on a computer with a MC68060 processor, say Y. Otherwise, say N. +endif # M68KCLASSIC + config M68328 bool depends on !MMU @@ -116,8 +129,6 @@ config M68VZ328 help Motorola 68VZ328 processor support. -endif # M68KCLASSIC - if COLDFIRE choice @@ -324,7 +335,7 @@ comment "Processor Specific Options" config M68KFPU_EMU bool "Math emulation support" - depends on M68KCLASSIC && FPU + depends on (M68KCLASSIC || SUN3) && FPU help At some point in the future, this will cause floating-point math instructions to be emulated by the kernel on machines that lack a @@ -398,23 +409,22 @@ config SINGLE_MEMORY_CHUNK Say N if not sure. config ARCH_FORCE_MAX_ORDER - int "Maximum zone order" if ADVANCED + int "Order of maximal physically contiguous allocations" if ADVANCED depends on !SINGLE_MEMORY_CHUNK - default "11" + default "10" help - The kernel memory allocator divides physically contiguous memory - blocks into "zones", where each zone is a power of two number of - pages. This option selects the largest power of two that the kernel - keeps in the memory allocator. If you need to allocate very large - blocks of physically contiguous memory, then you may need to - increase this value. + The kernel page allocator limits the size of maximal physically + contiguous allocations. The limit is called MAX_PAGE_ORDER and it + defines the maximal power of two of number of pages that can be + allocated as a single contiguous block. This option allows + overriding the default setting when ability to allocate very + large blocks of physically contiguous memory is required. For systems that have holes in their physical address space this value also defines the minimal size of the hole that allows freeing unused memory map. - This config option is actually maximum order plus one. For example, - a value of 11 means that the largest free memory block is 2^10 pages. + Don't change if unsure. config 060_WRITETHROUGH bool "Use write-through caching for 68060 supervisor accesses" @@ -537,3 +547,15 @@ config CACHE_COPYBACK The ColdFire CPU cache is set into Copy-back mode. endchoice endif # HAVE_CACHE_CB + +# Coldfire cores that do not have a data cache configured can do coherent DMA. +config COLDFIRE_COHERENT_DMA + bool + default y + depends on COLDFIRE + depends on !HAVE_CACHE_CB && !CACHE_D && !CACHE_BOTH + +config M68K_NONCOHERENT_DMA + bool + default y + depends on HAS_DMA && !COLDFIRE_COHERENT_DMA |