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Linux/arch/xtensa/Kconfig

  1 config ZONE_DMA
  2         def_bool y
  3 
  4 config XTENSA
  5         def_bool y
  6         select ARCH_WANT_FRAME_POINTERS
  7         select HAVE_IDE
  8         select GENERIC_ATOMIC64
  9         select GENERIC_CLOCKEVENTS
 10         select VIRT_TO_BUS
 11         select GENERIC_IRQ_SHOW
 12         select GENERIC_SCHED_CLOCK
 13         select MODULES_USE_ELF_RELA
 14         select GENERIC_PCI_IOMAP
 15         select ARCH_WANT_IPC_PARSE_VERSION
 16         select ARCH_WANT_OPTIONAL_GPIOLIB
 17         select CLONE_BACKWARDS
 18         select IRQ_DOMAIN
 19         select HAVE_OPROFILE
 20         select HAVE_FUNCTION_TRACER
 21         select HAVE_IRQ_TIME_ACCOUNTING
 22         select HAVE_PERF_EVENTS
 23         select COMMON_CLK
 24         help
 25           Xtensa processors are 32-bit RISC machines designed by Tensilica
 26           primarily for embedded systems.  These processors are both
 27           configurable and extensible.  The Linux port to the Xtensa
 28           architecture supports all processor configurations and extensions,
 29           with reasonable minimum requirements.  The Xtensa Linux project has
 30           a home page at <http://www.linux-xtensa.org/>.
 31 
 32 config RWSEM_XCHGADD_ALGORITHM
 33         def_bool y
 34 
 35 config GENERIC_HWEIGHT
 36         def_bool y
 37 
 38 config ARCH_HAS_ILOG2_U32
 39         def_bool n
 40 
 41 config ARCH_HAS_ILOG2_U64
 42         def_bool n
 43 
 44 config NO_IOPORT
 45         def_bool n
 46 
 47 config HZ
 48         int
 49         default 100
 50 
 51 source "init/Kconfig"
 52 source "kernel/Kconfig.freezer"
 53 
 54 config LOCKDEP_SUPPORT
 55         def_bool y
 56 
 57 config STACKTRACE_SUPPORT
 58         def_bool y
 59 
 60 config TRACE_IRQFLAGS_SUPPORT
 61         def_bool y
 62 
 63 config MMU
 64         def_bool n
 65 
 66 config VARIANT_IRQ_SWITCH
 67         def_bool n
 68 
 69 config HAVE_XTENSA_GPIO32
 70         def_bool n
 71 
 72 config MAY_HAVE_SMP
 73         def_bool n
 74 
 75 menu "Processor type and features"
 76 
 77 choice
 78         prompt "Xtensa Processor Configuration"
 79         default XTENSA_VARIANT_FSF
 80 
 81 config XTENSA_VARIANT_FSF
 82         bool "fsf - default (not generic) configuration"
 83         select MMU
 84 
 85 config XTENSA_VARIANT_DC232B
 86         bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
 87         select MMU
 88         select HAVE_XTENSA_GPIO32
 89         help
 90           This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
 91 
 92 config XTENSA_VARIANT_DC233C
 93         bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
 94         select MMU
 95         select HAVE_XTENSA_GPIO32
 96         help
 97           This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
 98 
 99 config XTENSA_VARIANT_S6000
100         bool "s6000 - Stretch software configurable processor"
101         select VARIANT_IRQ_SWITCH
102         select ARCH_REQUIRE_GPIOLIB
103         select XTENSA_CALIBRATE_CCOUNT
104 endchoice
105 
106 config XTENSA_UNALIGNED_USER
107         bool "Unaligned memory access in use space"
108         help
109           The Xtensa architecture currently does not handle unaligned
110           memory accesses in hardware but through an exception handler.
111           Per default, unaligned memory accesses are disabled in user space.
112 
113           Say Y here to enable unaligned memory access in user space.
114 
115 source "kernel/Kconfig.preempt"
116 
117 config HAVE_SMP
118         bool "System Supports SMP (MX)"
119         depends on MAY_HAVE_SMP
120         select XTENSA_MX
121         help
122           This option is use to indicate that the system-on-a-chip (SOC)
123           supports Multiprocessing. Multiprocessor support implemented above
124           the CPU core definition and currently needs to be selected manually.
125 
126           Multiprocessor support in implemented with external cache and
127           interrupt controlers.
128 
129           The MX interrupt distributer adds Interprocessor Interrupts
130           and causes the IRQ numbers to be increased by 4 for devices
131           like the open cores ethernet driver and the serial interface.
132 
133           You still have to select "Enable SMP" to enable SMP on this SOC.
134 
135 config SMP
136         bool "Enable Symmetric multi-processing support"
137         depends on HAVE_SMP
138         select GENERIC_SMP_IDLE_THREAD
139         help
140           Enabled SMP Software; allows more than one CPU/CORE
141           to be activated during startup.
142 
143 config NR_CPUS
144         depends on SMP
145         int "Maximum number of CPUs (2-32)"
146         range 2 32
147         default "4"
148 
149 config HOTPLUG_CPU
150         bool "Enable CPU hotplug support"
151         depends on SMP
152         help
153           Say Y here to allow turning CPUs off and on. CPUs can be
154           controlled through /sys/devices/system/cpu.
155 
156           Say N if you want to disable CPU hotplug.
157 
158 config MATH_EMULATION
159         bool "Math emulation"
160         help
161         Can we use information of configuration file?
162 
163 config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
164         bool "Initialize Xtensa MMU inside the Linux kernel code"
165         default y
166         help
167           Earlier version initialized the MMU in the exception vector
168           before jumping to _startup in head.S and had an advantage that
169           it was possible to place a software breakpoint at 'reset' and
170           then enter your normal kernel breakpoints once the MMU was mapped
171           to the kernel mappings (0XC0000000).
172 
173           This unfortunately doesn't work for U-Boot and likley also wont
174           work for using KEXEC to have a hot kernel ready for doing a
175           KDUMP.
176 
177           So now the MMU is initialized in head.S but it's necessary to
178           use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
179           xt-gdb can't place a Software Breakpoint in the  0XD region prior
180           to mapping the MMU and after mapping even if the area of low memory
181           was mapped gdb wouldn't remove the breakpoint on hitting it as the
182           PC wouldn't match. Since Hardware Breakpoints are recommended for
183           Linux configurations it seems reasonable to just assume they exist
184           and leave this older mechanism for unfortunate souls that choose
185           not to follow Tensilica's recommendation.
186 
187           Selecting this will cause U-Boot to set the KERNEL Load and Entry
188           address at 0x00003000 instead of the mapped std of 0xD0003000.
189 
190           If in doubt, say Y.
191 
192 endmenu
193 
194 config XTENSA_CALIBRATE_CCOUNT
195         def_bool n
196         help
197           On some platforms (XT2000, for example), the CPU clock rate can
198           vary.  The frequency can be determined, however, by measuring
199           against a well known, fixed frequency, such as an UART oscillator.
200 
201 config SERIAL_CONSOLE
202         def_bool n
203 
204 menu "Bus options"
205 
206 config PCI
207         bool "PCI support"
208         default y
209         help
210           Find out whether you have a PCI motherboard. PCI is the name of a
211           bus system, i.e. the way the CPU talks to the other stuff inside
212           your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
213           VESA. If you have PCI, say Y, otherwise N.
214 
215 source "drivers/pci/Kconfig"
216 
217 endmenu
218 
219 menu "Platform options"
220 
221 choice
222         prompt "Xtensa System Type"
223         default XTENSA_PLATFORM_ISS
224 
225 config XTENSA_PLATFORM_ISS
226         bool "ISS"
227         depends on TTY
228         select XTENSA_CALIBRATE_CCOUNT
229         select SERIAL_CONSOLE
230         help
231           ISS is an acronym for Tensilica's Instruction Set Simulator.
232 
233 config XTENSA_PLATFORM_XT2000
234         bool "XT2000"
235         help
236           XT2000 is the name of Tensilica's feature-rich emulation platform.
237           This hardware is capable of running a full Linux distribution.
238 
239 config XTENSA_PLATFORM_S6105
240         bool "S6105"
241         select SERIAL_CONSOLE
242         select NO_IOPORT
243 
244 config XTENSA_PLATFORM_XTFPGA
245         bool "XTFPGA"
246         select SERIAL_CONSOLE
247         select ETHOC
248         select XTENSA_CALIBRATE_CCOUNT
249         help
250           XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
251           This hardware is capable of running a full Linux distribution.
252 
253 endchoice
254 
255 
256 config XTENSA_CPU_CLOCK
257         int "CPU clock rate [MHz]"
258         depends on !XTENSA_CALIBRATE_CCOUNT
259         default 16
260 
261 config GENERIC_CALIBRATE_DELAY
262         bool "Auto calibration of the BogoMIPS value"
263         help
264           The BogoMIPS value can easily be derived from the CPU frequency.
265 
266 config CMDLINE_BOOL
267         bool "Default bootloader kernel arguments"
268 
269 config CMDLINE
270         string "Initial kernel command string"
271         depends on CMDLINE_BOOL
272         default "console=ttyS0,38400 root=/dev/ram"
273         help
274           On some architectures (EBSA110 and CATS), there is currently no way
275           for the boot loader to pass arguments to the kernel. For these
276           architectures, you should supply some command-line options at build
277           time by entering them here. As a minimum, you should specify the
278           memory size and the root device (e.g., mem=64M root=/dev/nfs).
279 
280 config USE_OF
281         bool "Flattened Device Tree support"
282         select OF
283         select OF_EARLY_FLATTREE
284         help
285           Include support for flattened device tree machine descriptions.
286 
287 config BUILTIN_DTB
288         string "DTB to build into the kernel image"
289         depends on OF
290 
291 config BLK_DEV_SIMDISK
292         tristate "Host file-based simulated block device support"
293         default n
294         depends on XTENSA_PLATFORM_ISS
295         help
296           Create block devices that map to files in the host file system.
297           Device binding to host file may be changed at runtime via proc
298           interface provided the device is not in use.
299 
300 config BLK_DEV_SIMDISK_COUNT
301         int "Number of host file-based simulated block devices"
302         range 1 10
303         depends on BLK_DEV_SIMDISK
304         default 2
305         help
306           This is the default minimal number of created block devices.
307           Kernel/module parameter 'simdisk_count' may be used to change this
308           value at runtime. More file names (but no more than 10) may be
309           specified as parameters, simdisk_count grows accordingly.
310 
311 config SIMDISK0_FILENAME
312         string "Host filename for the first simulated device"
313         depends on BLK_DEV_SIMDISK = y
314         default ""
315         help
316           Attach a first simdisk to a host file. Conventionally, this file
317           contains a root file system.
318 
319 config SIMDISK1_FILENAME
320         string "Host filename for the second simulated device"
321         depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
322         default ""
323         help
324           Another simulated disk in a host file for a buildroot-independent
325           storage.
326 
327 source "mm/Kconfig"
328 
329 source "drivers/pcmcia/Kconfig"
330 
331 source "drivers/pci/hotplug/Kconfig"
332 
333 endmenu
334 
335 menu "Executable file formats"
336 
337 source "fs/Kconfig.binfmt"
338 
339 endmenu
340 
341 source "net/Kconfig"
342 
343 source "drivers/Kconfig"
344 
345 source "fs/Kconfig"
346 
347 source "arch/xtensa/Kconfig.debug"
348 
349 source "security/Kconfig"
350 
351 source "crypto/Kconfig"
352 
353 source "lib/Kconfig"
354 
355 

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