6 select ARCH_WANT_FRAME_POINTERS
8 select GENERIC_ATOMIC64
9 select GENERIC_CLOCKEVENTS
11 select GENERIC_IRQ_SHOW
12 select GENERIC_CPU_DEVICES
13 select GENERIC_SCHED_CLOCK
14 select MODULES_USE_ELF_RELA
15 select GENERIC_PCI_IOMAP
16 select ARCH_WANT_IPC_PARSE_VERSION
17 select ARCH_WANT_OPTIONAL_GPIOLIB
18 select CLONE_BACKWARDS
21 select HAVE_FUNCTION_TRACER
23 Xtensa processors are 32-bit RISC machines designed by Tensilica
24 primarily for embedded systems. These processors are both
25 configurable and extensible. The Linux port to the Xtensa
26 architecture supports all processor configurations and extensions,
27 with reasonable minimum requirements. The Xtensa Linux project has
28 a home page at <http://www.linux-xtensa.org/>.
30 config RWSEM_XCHGADD_ALGORITHM
33 config GENERIC_HWEIGHT
36 config ARCH_HAS_ILOG2_U32
39 config ARCH_HAS_ILOG2_U64
50 source "kernel/Kconfig.freezer"
52 config LOCKDEP_SUPPORT
55 config STACKTRACE_SUPPORT
58 config TRACE_IRQFLAGS_SUPPORT
64 config VARIANT_IRQ_SWITCH
67 menu "Processor type and features"
70 prompt "Xtensa Processor Configuration"
71 default XTENSA_VARIANT_FSF
73 config XTENSA_VARIANT_FSF
74 bool "fsf - default (not generic) configuration"
77 config XTENSA_VARIANT_DC232B
78 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
81 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
83 config XTENSA_VARIANT_DC233C
84 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
87 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
89 config XTENSA_VARIANT_S6000
90 bool "s6000 - Stretch software configurable processor"
91 select VARIANT_IRQ_SWITCH
92 select ARCH_REQUIRE_GPIOLIB
93 select XTENSA_CALIBRATE_CCOUNT
96 config XTENSA_UNALIGNED_USER
97 bool "Unaligned memory access in use space"
99 The Xtensa architecture currently does not handle unaligned
100 memory accesses in hardware but through an exception handler.
101 Per default, unaligned memory accesses are disabled in user space.
103 Say Y here to enable unaligned memory access in user space.
105 source "kernel/Kconfig.preempt"
107 config MATH_EMULATION
108 bool "Math emulation"
110 Can we use information of configuration file?
112 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
113 bool "Initialize Xtensa MMU inside the Linux kernel code"
116 Earlier version initialized the MMU in the exception vector
117 before jumping to _startup in head.S and had an advantage that
118 it was possible to place a software breakpoint at 'reset' and
119 then enter your normal kernel breakpoints once the MMU was mapped
120 to the kernel mappings (0XC0000000).
122 This unfortunately doesn't work for U-Boot and likley also wont
123 work for using KEXEC to have a hot kernel ready for doing a
126 So now the MMU is initialized in head.S but it's necessary to
127 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
128 xt-gdb can't place a Software Breakpoint in the 0XD region prior
129 to mapping the MMU and after mapping even if the area of low memory
130 was mapped gdb wouldn't remove the breakpoint on hitting it as the
131 PC wouldn't match. Since Hardware Breakpoints are recommended for
132 Linux configurations it seems reasonable to just assume they exist
133 and leave this older mechanism for unfortunate souls that choose
134 not to follow Tensilica's recommendation.
136 Selecting this will cause U-Boot to set the KERNEL Load and Entry
137 address at 0x00003000 instead of the mapped std of 0xD0003000.
143 config XTENSA_CALIBRATE_CCOUNT
146 On some platforms (XT2000, for example), the CPU clock rate can
147 vary. The frequency can be determined, however, by measuring
148 against a well known, fixed frequency, such as an UART oscillator.
150 config SERIAL_CONSOLE
153 config XTENSA_ISS_NETWORK
162 Find out whether you have a PCI motherboard. PCI is the name of a
163 bus system, i.e. the way the CPU talks to the other stuff inside
164 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
165 VESA. If you have PCI, say Y, otherwise N.
167 source "drivers/pci/Kconfig"
171 menu "Platform options"
174 prompt "Xtensa System Type"
175 default XTENSA_PLATFORM_ISS
177 config XTENSA_PLATFORM_ISS
180 select XTENSA_CALIBRATE_CCOUNT
181 select SERIAL_CONSOLE
182 select XTENSA_ISS_NETWORK
184 ISS is an acronym for Tensilica's Instruction Set Simulator.
186 config XTENSA_PLATFORM_XT2000
189 XT2000 is the name of Tensilica's feature-rich emulation platform.
190 This hardware is capable of running a full Linux distribution.
192 config XTENSA_PLATFORM_S6105
194 select SERIAL_CONSOLE
197 config XTENSA_PLATFORM_XTFPGA
199 select SERIAL_CONSOLE
201 select XTENSA_CALIBRATE_CCOUNT
203 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
204 This hardware is capable of running a full Linux distribution.
209 config XTENSA_CPU_CLOCK
210 int "CPU clock rate [MHz]"
211 depends on !XTENSA_CALIBRATE_CCOUNT
214 config GENERIC_CALIBRATE_DELAY
215 bool "Auto calibration of the BogoMIPS value"
217 The BogoMIPS value can easily be derived from the CPU frequency.
220 bool "Default bootloader kernel arguments"
223 string "Initial kernel command string"
224 depends on CMDLINE_BOOL
225 default "console=ttyS0,38400 root=/dev/ram"
227 On some architectures (EBSA110 and CATS), there is currently no way
228 for the boot loader to pass arguments to the kernel. For these
229 architectures, you should supply some command-line options at build
230 time by entering them here. As a minimum, you should specify the
231 memory size and the root device (e.g., mem=64M root=/dev/nfs).
234 bool "Flattened Device Tree support"
236 select OF_EARLY_FLATTREE
238 Include support for flattened device tree machine descriptions.
241 string "DTB to build into the kernel image"
244 config BLK_DEV_SIMDISK
245 tristate "Host file-based simulated block device support"
247 depends on XTENSA_PLATFORM_ISS
249 Create block devices that map to files in the host file system.
250 Device binding to host file may be changed at runtime via proc
251 interface provided the device is not in use.
253 config BLK_DEV_SIMDISK_COUNT
254 int "Number of host file-based simulated block devices"
256 depends on BLK_DEV_SIMDISK
259 This is the default minimal number of created block devices.
260 Kernel/module parameter 'simdisk_count' may be used to change this
261 value at runtime. More file names (but no more than 10) may be
262 specified as parameters, simdisk_count grows accordingly.
264 config SIMDISK0_FILENAME
265 string "Host filename for the first simulated device"
266 depends on BLK_DEV_SIMDISK = y
269 Attach a first simdisk to a host file. Conventionally, this file
270 contains a root file system.
272 config SIMDISK1_FILENAME
273 string "Host filename for the second simulated device"
274 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
277 Another simulated disk in a host file for a buildroot-independent
282 source "drivers/pcmcia/Kconfig"
284 source "drivers/pci/hotplug/Kconfig"
288 menu "Executable file formats"
290 source "fs/Kconfig.binfmt"
296 source "drivers/Kconfig"
300 source "arch/xtensa/Kconfig.debug"
302 source "security/Kconfig"
304 source "crypto/Kconfig"