config ZONE_DMA def_bool y config XTENSA def_bool y select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_IPC_PARSE_VERSION select ARCH_WANT_OPTIONAL_GPIOLIB select BUILDTIME_EXTABLE_SORT select CLONE_BACKWARDS select COMMON_CLK select GENERIC_ATOMIC64 select GENERIC_CLOCKEVENTS select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK select HAVE_FUNCTION_TRACER select HAVE_IRQ_TIME_ACCOUNTING select HAVE_OPROFILE select HAVE_PERF_EVENTS select IRQ_DOMAIN select MODULES_USE_ELF_RELA select VIRT_TO_BUS help Xtensa processors are 32-bit RISC machines designed by Tensilica primarily for embedded systems. These processors are both configurable and extensible. The Linux port to the Xtensa architecture supports all processor configurations and extensions, with reasonable minimum requirements. The Xtensa Linux project has a home page at . config RWSEM_XCHGADD_ALGORITHM def_bool y config GENERIC_HWEIGHT def_bool y config ARCH_HAS_ILOG2_U32 def_bool n config ARCH_HAS_ILOG2_U64 def_bool n config NO_IOPORT_MAP def_bool n config HZ int default 100 source "init/Kconfig" source "kernel/Kconfig.freezer" config LOCKDEP_SUPPORT def_bool y config STACKTRACE_SUPPORT def_bool y config TRACE_IRQFLAGS_SUPPORT def_bool y config MMU bool default n if !XTENSA_VARIANT_CUSTOM default XTENSA_VARIANT_MMU if XTENSA_VARIANT_CUSTOM config VARIANT_IRQ_SWITCH def_bool n config HAVE_XTENSA_GPIO32 def_bool n config MAY_HAVE_SMP def_bool n menu "Processor type and features" choice prompt "Xtensa Processor Configuration" default XTENSA_VARIANT_FSF config XTENSA_VARIANT_FSF bool "fsf - default (not generic) configuration" select MMU config XTENSA_VARIANT_DC232B bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" select MMU select HAVE_XTENSA_GPIO32 help This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). config XTENSA_VARIANT_DC233C bool "dc233c - Diamond 233L Standard Core Rev.C (LE)" select MMU select HAVE_XTENSA_GPIO32 help This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE). config XTENSA_VARIANT_S6000 bool "s6000 - Stretch software configurable processor" select VARIANT_IRQ_SWITCH select ARCH_REQUIRE_GPIOLIB select XTENSA_CALIBRATE_CCOUNT config XTENSA_VARIANT_CUSTOM bool "Custom Xtensa processor configuration" select MAY_HAVE_SMP select HAVE_XTENSA_GPIO32 help Select this variant to use a custom Xtensa processor configuration. You will be prompted for a processor variant CORENAME. endchoice config XTENSA_VARIANT_CUSTOM_NAME string "Xtensa Processor Custom Core Variant Name" depends on XTENSA_VARIANT_CUSTOM help Provide the name of a custom Xtensa processor variant. This CORENAME selects arch/xtensa/variant/CORENAME. Dont forget you have to select MMU if you have one. config XTENSA_VARIANT_NAME string default "dc232b" if XTENSA_VARIANT_DC232B default "dc233c" if XTENSA_VARIANT_DC233C default "fsf" if XTENSA_VARIANT_FSF default "s6000" if XTENSA_VARIANT_S6000 default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM config XTENSA_VARIANT_MMU bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)" depends on XTENSA_VARIANT_CUSTOM default y help Build a Conventional Kernel with full MMU support, ie: it supports a TLB with auto-loading, page protection. config XTENSA_UNALIGNED_USER bool "Unaligned memory access in use space" help The Xtensa architecture currently does not handle unaligned memory accesses in hardware but through an exception handler. Per default, unaligned memory accesses are disabled in user space. Say Y here to enable unaligned memory access in user space. source "kernel/Kconfig.preempt" config HAVE_SMP bool "System Supports SMP (MX)" depends on MAY_HAVE_SMP select XTENSA_MX help This option is use to indicate that the system-on-a-chip (SOC) supports Multiprocessing. Multiprocessor support implemented above the CPU core definition and currently needs to be selected manually. Multiprocessor support in implemented with external cache and interrupt controlers. The MX interrupt distributer adds Interprocessor Interrupts and causes the IRQ numbers to be increased by 4 for devices like the open cores ethernet driver and the serial interface. You still have to select "Enable SMP" to enable SMP on this SOC. config SMP bool "Enable Symmetric multi-processing support" depends on HAVE_SMP select GENERIC_SMP_IDLE_THREAD help Enabled SMP Software; allows more than one CPU/CORE to be activated during startup. config NR_CPUS depends on SMP int "Maximum number of CPUs (2-32)" range 2 32 default "4" config HOTPLUG_CPU bool "Enable CPU hotplug support" depends on SMP help Say Y here to allow turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. Say N if you want to disable CPU hotplug. config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX bool "Initialize Xtensa MMU inside the Linux kernel code" default y help Earlier version initialized the MMU in the exception vector before jumping to _startup in head.S and had an advantage that it was possible to place a software breakpoint at 'reset' and then enter your normal kernel breakpoints once the MMU was mapped to the kernel mappings (0XC0000000). This unfortunately doesn't work for U-Boot and likley also wont work for using KEXEC to have a hot kernel ready for doing a KDUMP. So now the MMU is initialized in head.S but it's necessary to use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup. xt-gdb can't place a Software Breakpoint in the 0XD region prior to mapping the MMU and after mapping even if the area of low memory was mapped gdb wouldn't remove the breakpoint on hitting it as the PC wouldn't match. Since Hardware Breakpoints are recommended for Linux configurations it seems reasonable to just assume they exist and leave this older mechanism for unfortunate souls that choose not to follow Tensilica's recommendation. Selecting this will cause U-Boot to set the KERNEL Load and Entry address at 0x00003000 instead of the mapped std of 0xD0003000. If in doubt, say Y. config HIGHMEM bool "High Memory Support" depends on MMU help Linux can use the full amount of RAM in the system by default. However, the default MMUv2 setup only maps the lowermost 128 MB of memory linearly to the areas starting at 0xd0000000 (cached) and 0xd8000000 (uncached). When there are more than 128 MB memory in the system not all of it can be "permanently mapped" by the kernel. The physical memory that's not permanently mapped is called "high memory". If you are compiling a kernel which will never run on a machine with more than 128 MB total physical RAM, answer N here. If unsure, say Y. config FAST_SYSCALL_XTENSA bool "Enable fast atomic syscalls" default n help fast_syscall_xtensa is a syscall that can make atomic operations on UP kernel when processor has no s32c1i support. This syscall is deprecated. It may have issues when called with invalid arguments. It is provided only for backwards compatibility. Only enable it if your userspace software requires it. If unsure, say N. config FAST_SYSCALL_SPILL_REGISTERS bool "Enable spill registers syscall" default n help fast_syscall_spill_registers is a syscall that spills all active register windows of a calling userspace task onto its stack. This syscall is deprecated. It may have issues when called with invalid arguments. It is provided only for backwards compatibility. Only enable it if your userspace software requires it. If unsure, say N. endmenu config XTENSA_CALIBRATE_CCOUNT def_bool n help On some platforms (XT2000, for example), the CPU clock rate can vary. The frequency can be determined, however, by measuring against a well known, fixed frequency, such as an UART oscillator. config SERIAL_CONSOLE def_bool n menu "Bus options" config PCI bool "PCI support" default y help Find out whether you have a PCI motherboard. PCI is the name of a bus system, i.e. the way the CPU talks to the other stuff inside your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or VESA. If you have PCI, say Y, otherwise N. source "drivers/pci/Kconfig" endmenu menu "Platform options" choice prompt "Xtensa System Type" default XTENSA_PLATFORM_ISS config XTENSA_PLATFORM_ISS bool "ISS" select XTENSA_CALIBRATE_CCOUNT select SERIAL_CONSOLE help ISS is an acronym for Tensilica's Instruction Set Simulator. config XTENSA_PLATFORM_XT2000 bool "XT2000" select HAVE_IDE help XT2000 is the name of Tensilica's feature-rich emulation platform. This hardware is capable of running a full Linux distribution. config XTENSA_PLATFORM_S6105 bool "S6105" select HAVE_IDE select SERIAL_CONSOLE select NO_IOPORT_MAP config XTENSA_PLATFORM_XTFPGA bool "XTFPGA" select ETHOC if ETHERNET select PLATFORM_WANT_DEFAULT_MEM select SERIAL_CONSOLE select XTENSA_CALIBRATE_CCOUNT help XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605). This hardware is capable of running a full Linux distribution. endchoice config XTENSA_CPU_CLOCK int "CPU clock rate [MHz]" depends on !XTENSA_CALIBRATE_CCOUNT default 16 config GENERIC_CALIBRATE_DELAY bool "Auto calibration of the BogoMIPS value" help The BogoMIPS value can easily be derived from the CPU frequency. config CMDLINE_BOOL bool "Default bootloader kernel arguments" config CMDLINE string "Initial kernel command string" depends on CMDLINE_BOOL default "console=ttyS0,38400 root=/dev/ram" help On some architectures (EBSA110 and CATS), there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here. As a minimum, you should specify the memory size and the root device (e.g., mem=64M root=/dev/nfs). config USE_OF bool "Flattened Device Tree support" select OF select OF_EARLY_FLATTREE help Include support for flattened device tree machine descriptions. config BUILTIN_DTB string "DTB to build into the kernel image" depends on OF config BLK_DEV_SIMDISK tristate "Host file-based simulated block device support" default n depends on XTENSA_PLATFORM_ISS && BLOCK help Create block devices that map to files in the host file system. Device binding to host file may be changed at runtime via proc interface provided the device is not in use. config BLK_DEV_SIMDISK_COUNT int "Number of host file-based simulated block devices" range 1 10 depends on BLK_DEV_SIMDISK default 2 help This is the default minimal number of created block devices. Kernel/module parameter 'simdisk_count' may be used to change this value at runtime. More file names (but no more than 10) may be specified as parameters, simdisk_count grows accordingly. config SIMDISK0_FILENAME string "Host filename for the first simulated device" depends on BLK_DEV_SIMDISK = y default "" help Attach a first simdisk to a host file. Conventionally, this file contains a root file system. config SIMDISK1_FILENAME string "Host filename for the second simulated device" depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1 default "" help Another simulated disk in a host file for a buildroot-independent storage. source "mm/Kconfig" source "drivers/pcmcia/Kconfig" source "drivers/pci/hotplug/Kconfig" config PLATFORM_WANT_DEFAULT_MEM def_bool n config DEFAULT_MEM_START hex "Physical address of the default memory area start" depends on PLATFORM_WANT_DEFAULT_MEM default 0x00000000 if MMU default 0x40000000 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. In noMMU configuration the following parameters are derived from it: - kernel load address; - kernel entry point address; - relocatable vectors base address; - uBoot load address; - TASK_SIZE. If unsure, leave the default value here. config DEFAULT_MEM_SIZE hex "Maximal size of the default memory area" 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. If unsure, leave the default value here. endmenu menu "Executable file formats" source "fs/Kconfig.binfmt" endmenu source "net/Kconfig" source "drivers/Kconfig" source "fs/Kconfig" source "arch/xtensa/Kconfig.debug" source "security/Kconfig" source "crypto/Kconfig" source "lib/Kconfig"