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 config HAVE_XTENSA_GPIO32
70 menu "Processor type and features"
73 prompt "Xtensa Processor Configuration"
74 default XTENSA_VARIANT_FSF
76 config XTENSA_VARIANT_FSF
77 bool "fsf - default (not generic) configuration"
79 select HAVE_XTENSA_GPIO32
81 config XTENSA_VARIANT_DC232B
82 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
84 select HAVE_XTENSA_GPIO32
86 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
88 config XTENSA_VARIANT_DC233C
89 bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
91 select HAVE_XTENSA_GPIO32
93 This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
95 config XTENSA_VARIANT_S6000
96 bool "s6000 - Stretch software configurable processor"
97 select VARIANT_IRQ_SWITCH
98 select ARCH_REQUIRE_GPIOLIB
99 select XTENSA_CALIBRATE_CCOUNT
102 config XTENSA_UNALIGNED_USER
103 bool "Unaligned memory access in use space"
105 The Xtensa architecture currently does not handle unaligned
106 memory accesses in hardware but through an exception handler.
107 Per default, unaligned memory accesses are disabled in user space.
109 Say Y here to enable unaligned memory access in user space.
111 source "kernel/Kconfig.preempt"
113 config MATH_EMULATION
114 bool "Math emulation"
116 Can we use information of configuration file?
118 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
119 bool "Initialize Xtensa MMU inside the Linux kernel code"
122 Earlier version initialized the MMU in the exception vector
123 before jumping to _startup in head.S and had an advantage that
124 it was possible to place a software breakpoint at 'reset' and
125 then enter your normal kernel breakpoints once the MMU was mapped
126 to the kernel mappings (0XC0000000).
128 This unfortunately doesn't work for U-Boot and likley also wont
129 work for using KEXEC to have a hot kernel ready for doing a
132 So now the MMU is initialized in head.S but it's necessary to
133 use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
134 xt-gdb can't place a Software Breakpoint in the 0XD region prior
135 to mapping the MMU and after mapping even if the area of low memory
136 was mapped gdb wouldn't remove the breakpoint on hitting it as the
137 PC wouldn't match. Since Hardware Breakpoints are recommended for
138 Linux configurations it seems reasonable to just assume they exist
139 and leave this older mechanism for unfortunate souls that choose
140 not to follow Tensilica's recommendation.
142 Selecting this will cause U-Boot to set the KERNEL Load and Entry
143 address at 0x00003000 instead of the mapped std of 0xD0003000.
149 config XTENSA_CALIBRATE_CCOUNT
152 On some platforms (XT2000, for example), the CPU clock rate can
153 vary. The frequency can be determined, however, by measuring
154 against a well known, fixed frequency, such as an UART oscillator.
156 config SERIAL_CONSOLE
159 config XTENSA_ISS_NETWORK
168 Find out whether you have a PCI motherboard. PCI is the name of a
169 bus system, i.e. the way the CPU talks to the other stuff inside
170 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
171 VESA. If you have PCI, say Y, otherwise N.
173 source "drivers/pci/Kconfig"
177 menu "Platform options"
180 prompt "Xtensa System Type"
181 default XTENSA_PLATFORM_ISS
183 config XTENSA_PLATFORM_ISS
186 select XTENSA_CALIBRATE_CCOUNT
187 select SERIAL_CONSOLE
188 select XTENSA_ISS_NETWORK
190 ISS is an acronym for Tensilica's Instruction Set Simulator.
192 config XTENSA_PLATFORM_XT2000
195 XT2000 is the name of Tensilica's feature-rich emulation platform.
196 This hardware is capable of running a full Linux distribution.
198 config XTENSA_PLATFORM_S6105
200 select SERIAL_CONSOLE
203 config XTENSA_PLATFORM_XTFPGA
205 select SERIAL_CONSOLE
207 select XTENSA_CALIBRATE_CCOUNT
209 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
210 This hardware is capable of running a full Linux distribution.
215 config XTENSA_CPU_CLOCK
216 int "CPU clock rate [MHz]"
217 depends on !XTENSA_CALIBRATE_CCOUNT
220 config GENERIC_CALIBRATE_DELAY
221 bool "Auto calibration of the BogoMIPS value"
223 The BogoMIPS value can easily be derived from the CPU frequency.
226 bool "Default bootloader kernel arguments"
229 string "Initial kernel command string"
230 depends on CMDLINE_BOOL
231 default "console=ttyS0,38400 root=/dev/ram"
233 On some architectures (EBSA110 and CATS), there is currently no way
234 for the boot loader to pass arguments to the kernel. For these
235 architectures, you should supply some command-line options at build
236 time by entering them here. As a minimum, you should specify the
237 memory size and the root device (e.g., mem=64M root=/dev/nfs).
240 bool "Flattened Device Tree support"
242 select OF_EARLY_FLATTREE
244 Include support for flattened device tree machine descriptions.
247 string "DTB to build into the kernel image"
250 config BLK_DEV_SIMDISK
251 tristate "Host file-based simulated block device support"
253 depends on XTENSA_PLATFORM_ISS
255 Create block devices that map to files in the host file system.
256 Device binding to host file may be changed at runtime via proc
257 interface provided the device is not in use.
259 config BLK_DEV_SIMDISK_COUNT
260 int "Number of host file-based simulated block devices"
262 depends on BLK_DEV_SIMDISK
265 This is the default minimal number of created block devices.
266 Kernel/module parameter 'simdisk_count' may be used to change this
267 value at runtime. More file names (but no more than 10) may be
268 specified as parameters, simdisk_count grows accordingly.
270 config SIMDISK0_FILENAME
271 string "Host filename for the first simulated device"
272 depends on BLK_DEV_SIMDISK = y
275 Attach a first simdisk to a host file. Conventionally, this file
276 contains a root file system.
278 config SIMDISK1_FILENAME
279 string "Host filename for the second simulated device"
280 depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
283 Another simulated disk in a host file for a buildroot-independent
288 source "drivers/pcmcia/Kconfig"
290 source "drivers/pci/hotplug/Kconfig"
294 menu "Executable file formats"
296 source "fs/Kconfig.binfmt"
302 source "drivers/Kconfig"
306 source "arch/xtensa/Kconfig.debug"
308 source "security/Kconfig"
310 source "crypto/Kconfig"