# SPDX-License-Identifier: GPL-2.0 comment "Processor Type" choice prompt "CPU family support" default M68KCLASSIC if MMU default COLDFIRE if !MMU help The Freescale (was Motorola) M68K family of processors implements the full 68000 processor instruction set. The Freescale ColdFire family of processors is a modern derivative of the 68000 processor family. They are mainly targeted at embedded applications, and are all System-On-Chip (SOC) devices, as opposed to stand alone CPUs. They implement a subset of the original 68000 processor instruction set. If you anticipate running this kernel on a computer with a classic MC68xxx processor, select M68KCLASSIC. If you anticipate running this kernel on a computer with a ColdFire processor, select COLDFIRE. config M68KCLASSIC bool "Classic M68K CPU family support" select HAVE_ARCH_PFN_VALID config COLDFIRE bool "Coldfire CPU family support" select CPU_HAS_NO_BITFIELDS select CPU_HAS_NO_CAS select CPU_HAS_NO_MULDIV64 select GENERIC_CSUM select GPIOLIB select HAVE_LEGACY_CLK endchoice if M68KCLASSIC config M68000 def_bool y depends on !MMU select CPU_HAS_NO_BITFIELDS select CPU_HAS_NO_CAS select CPU_HAS_NO_MULDIV64 select CPU_HAS_NO_UNALIGNED select GENERIC_CSUM select CPU_NO_EFFICIENT_FFS select HAVE_ARCH_HASH select LEGACY_TIMER_TICK help The Freescale (was Motorola) 68000 CPU is the first generation of the well known M68K family of processors. The CPU core as well as being available as a stand alone CPU was also used in many System-On-Chip devices (eg 68328, 68302, etc). It does not contain a paging MMU. config M68020 bool "68020 support" depends on MMU select FPU select CPU_HAS_ADDRESS_SPACES help If you anticipate running this kernel on a computer with a MC68020 processor, say Y. Otherwise, say N. Note that the 68020 requires a 68851 MMU (Memory Management Unit) to run Linux/m68k, except on the Sun 3, which provides its own version. config M68030 bool "68030 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 MC68030 processor, say Y. Otherwise, say N. Note that a MC68EC030 will not work, as it does not include an MMU (Memory Management Unit). config M68040 bool "68040 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 MC68LC040 or MC68040 processor, say Y. Otherwise, say N. Note that an MC68EC040 will not work, as it does not include an MMU (Memory Management Unit). 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. config M68328 bool depends on !MMU select M68000 help Motorola 68328 processor support. config M68EZ328 bool depends on !MMU select M68000 help Motorola 68EX328 processor support. config M68VZ328 bool depends on !MMU select M68000 help Motorola 68VZ328 processor support. endif # M68KCLASSIC if COLDFIRE choice prompt "ColdFire SoC type" default M520x help Select the type of ColdFire System-on-Chip (SoC) that you want to build for. config M5206 bool "MCF5206" depends on !MMU select COLDFIRE_SW_A7 select COLDFIRE_TIMERS select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Motorola ColdFire 5206 processor support. config M5206e bool "MCF5206e" depends on !MMU select COLDFIRE_SW_A7 select COLDFIRE_TIMERS select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Motorola ColdFire 5206e processor support. config M520x bool "MCF520x" depends on !MMU select COLDFIRE_PIT_TIMER select HAVE_CACHE_SPLIT help Freescale Coldfire 5207/5208 processor support. config M523x bool "MCF523x" depends on !MMU select COLDFIRE_PIT_TIMER select HAVE_CACHE_SPLIT select HAVE_IPSBAR help Freescale Coldfire 5230/1/2/4/5 processor support config M5249 bool "MCF5249" depends on !MMU select COLDFIRE_SW_A7 select COLDFIRE_TIMERS select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Motorola ColdFire 5249 processor support. config M525x bool "MCF525x" depends on !MMU select COLDFIRE_SW_A7 select COLDFIRE_TIMERS select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Freescale (Motorola) Coldfire 5251/5253 processor support. config M5271 bool "MCF5271" depends on !MMU select COLDFIRE_PIT_TIMER select M527x select HAVE_CACHE_SPLIT select HAVE_IPSBAR help Freescale (Motorola) ColdFire 5270/5271 processor support. config M5272 bool "MCF5272" depends on !MMU select COLDFIRE_SW_A7 select COLDFIRE_TIMERS select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Motorola ColdFire 5272 processor support. config M5275 bool "MCF5275" depends on !MMU select COLDFIRE_PIT_TIMER select M527x select HAVE_CACHE_SPLIT select HAVE_IPSBAR help Freescale (Motorola) ColdFire 5274/5275 processor support. config M528x bool "MCF528x" depends on !MMU select COLDFIRE_PIT_TIMER select HAVE_CACHE_SPLIT select HAVE_IPSBAR help Motorola ColdFire 5280/5282 processor support. config M5307 bool "MCF5307" depends on !MMU select COLDFIRE_TIMERS select COLDFIRE_SW_A7 select HAVE_CACHE_CB select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Motorola ColdFire 5307 processor support. config M532x bool "MCF532x" depends on !MMU select COLDFIRE_TIMERS select M53xx select HAVE_CACHE_CB help Freescale (Motorola) ColdFire 532x processor support. config M537x bool "MCF537x" depends on !MMU select COLDFIRE_TIMERS select M53xx select HAVE_CACHE_CB help Freescale ColdFire 537x processor support. config M5407 bool "MCF5407" depends on !MMU select COLDFIRE_SW_A7 select COLDFIRE_TIMERS select HAVE_CACHE_CB select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Motorola ColdFire 5407 processor support. config M547x bool "MCF547x" select M54xx select COLDFIRE_SLTIMERS select MMU_COLDFIRE if MMU select FPU if MMU select HAVE_CACHE_CB select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Freescale ColdFire 5470/5471/5472/5473/5474/5475 processor support. config M548x bool "MCF548x" select COLDFIRE_SLTIMERS select MMU_COLDFIRE if MMU select FPU if MMU select M54xx select HAVE_CACHE_CB select HAVE_MBAR select CPU_NO_EFFICIENT_FFS help Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support. config M5441x bool "MCF5441x" select COLDFIRE_PIT_TIMER select MMU_COLDFIRE if MMU select HAVE_CACHE_CB help Freescale Coldfire 54410/54415/54416/54417/54418 processor support. endchoice config M527x bool config M53xx bool config M54xx select HAVE_PCI bool config COLDFIRE_PIT_TIMER bool config COLDFIRE_TIMERS bool select LEGACY_TIMER_TICK config COLDFIRE_SLTIMERS bool select LEGACY_TIMER_TICK endif # COLDFIRE comment "Processor Specific Options" config M68KFPU_EMU bool "Math emulation support" depends on M68KCLASSIC && 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 floating-point math coprocessor. Thrill-seekers and chronically sleep-deprived psychotic hacker types can say Y now, everyone else should probably wait a while. config M68KFPU_EMU_EXTRAPREC bool "Math emulation extra precision" depends on M68KFPU_EMU help The fpu uses normally a few bit more during calculations for correct rounding, the emulator can (often) do the same but this extra calculation can cost quite some time, so you can disable it here. The emulator will then "only" calculate with a 64 bit mantissa and round slightly incorrect, what is more than enough for normal usage. config M68KFPU_EMU_ONLY bool "Math emulation only kernel" depends on M68KFPU_EMU help This option prevents any floating-point instructions from being compiled into the kernel, thereby the kernel doesn't save any floating point context anymore during task switches, so this kernel will only be usable on machines without a floating-point math coprocessor. This makes the kernel a bit faster as no tests needs to be executed whether a floating-point instruction in the kernel should be executed or not. config ADVANCED bool "Advanced configuration options" depends on MMU help This gives you access to some advanced options for the CPU. The defaults should be fine for most users, but these options may make it possible for you to improve performance somewhat if you know what you are doing. Note that the answer to this question won't directly affect the kernel: saying N will just cause the configurator to skip all the questions about these options. Most users should say N to this question. config RMW_INSNS bool "Use read-modify-write instructions" depends on ADVANCED && !CPU_HAS_NO_CAS help This allows to use certain instructions that work with indivisible read-modify-write bus cycles. While this is faster than the workaround of disabling interrupts, it can conflict with DMA ( = direct memory access) on many Amiga systems, and it is also said to destabilize other machines. It is very likely that this will cause serious problems on any Amiga or Atari Medusa if set. The only configuration where it should work are 68030-based Ataris, where it apparently improves performance. But you've been warned! Unless you really know what you are doing, say N. Try Y only if you're quite adventurous. config SINGLE_MEMORY_CHUNK bool "Use one physical chunk of memory only" if ADVANCED && !SUN3 depends on MMU default y if SUN3 || MMU_COLDFIRE help Ignore all but the first contiguous chunk of physical memory for VM purposes. This will save a few bytes kernel size and may speed up some operations. When this option os set to N, you may want to lower "Maximum zone order" to save memory that could be wasted for unused memory map. Say N if not sure. config ARCH_FORCE_MAX_ORDER int "Order of maximal physically contiguous allocations" if ADVANCED depends on !SINGLE_MEMORY_CHUNK default "10" help The kernel page allocator limits the size of maximal physically contiguous allocations. The limit is called MAX_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. Don't change if unsure. config 060_WRITETHROUGH bool "Use write-through caching for 68060 supervisor accesses" depends on ADVANCED && M68060 help The 68060 generally uses copyback caching of recently accessed data. Copyback caching means that memory writes will be held in an on-chip cache and only written back to memory some time later. Saying Y here will force supervisor (kernel) accesses to use writethrough caching. Writethrough caching means that data is written to memory straight away, so that cache and memory data always agree. Writethrough caching is less efficient, but is needed for some drivers on 68060 based systems where the 68060 bus snooping signal is hardwired on. The 53c710 SCSI driver is known to suffer from this problem. config M68K_L2_CACHE bool depends on MAC default y config CPU_HAS_NO_BITFIELDS bool config CPU_HAS_NO_CAS bool config CPU_HAS_NO_MULDIV64 bool config CPU_HAS_NO_UNALIGNED bool config CPU_HAS_ADDRESS_SPACES bool select ALTERNATE_USER_ADDRESS_SPACE config FPU bool config COLDFIRE_SW_A7 bool config HAVE_CACHE_SPLIT bool config HAVE_CACHE_CB bool config HAVE_MBAR bool config HAVE_IPSBAR bool config CLOCK_FREQ int "Set the core clock frequency" default "25000000" if M5206 default "54000000" if M5206e default "166666666" if M520x default "140000000" if M5249 default "150000000" if M527x || M523x default "90000000" if M5307 default "50000000" if M5407 default "266000000" if M54xx default "66666666" depends on COLDFIRE help Define the CPU clock frequency in use. This is the core clock frequency, it may or may not be the same as the external clock crystal fitted to your board. Some processors have an internal PLL and can have their frequency programmed at run time, others use internal dividers. In general the kernel won't setup a PLL if it is fitted (there are some exceptions). This value will be specific to the exact CPU that you are using. config OLDMASK bool "Old mask 5307 (1H55J) silicon" depends on M5307 help Build support for the older revision ColdFire 5307 silicon. Specifically this is the 1H55J mask revision. if HAVE_CACHE_SPLIT choice prompt "Split Cache Configuration" default CACHE_I config CACHE_I bool "Instruction" help Use all of the ColdFire CPU cache memory as an instruction cache. config CACHE_D bool "Data" help Use all of the ColdFire CPU cache memory as a data cache. config CACHE_BOTH bool "Both" help Split the ColdFire CPU cache, and use half as an instruction cache and half as a data cache. endchoice endif # HAVE_CACHE_SPLIT if HAVE_CACHE_CB choice prompt "Data cache mode" default CACHE_WRITETHRU config CACHE_WRITETHRU bool "Write-through" help The ColdFire CPU cache is set into Write-through mode. config CACHE_COPYBACK bool "Copy-back" help The ColdFire CPU cache is set into Copy-back mode. endchoice endif # HAVE_CACHE_CB