10 select GENERIC_ATOMIC64
11 select HAVE_GENERIC_HARDIRQS
12 select GENERIC_IRQ_SHOW
13 select GENERIC_CPU_DEVICES
14 select MODULES_USE_ELF_RELA
15 select GENERIC_PCI_IOMAP
16 select ARCH_WANT_OPTIONAL_GPIOLIB
17 select CLONE_BACKWARDS
19 select GENERIC_SIGALTSTACK
21 Xtensa processors are 32-bit RISC machines designed by Tensilica
22 primarily for embedded systems. These processors are both
23 configurable and extensible. The Linux port to the Xtensa
24 architecture supports all processor configurations and extensions,
25 with reasonable minimum requirements. The Xtensa Linux project has
26 a home page at <http://xtensa.sourceforge.net/>.
28 config RWSEM_XCHGADD_ALGORITHM
31 config GENERIC_HWEIGHT
37 config ARCH_HAS_ILOG2_U32
40 config ARCH_HAS_ILOG2_U64
51 source "kernel/Kconfig.freezer"
56 config VARIANT_IRQ_SWITCH
59 menu "Processor type and features"
62 prompt "Xtensa Processor Configuration"
63 default XTENSA_VARIANT_FSF
65 config XTENSA_VARIANT_FSF
66 bool "fsf - default (not generic) configuration"
69 config XTENSA_VARIANT_DC232B
70 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
73 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
75 config XTENSA_VARIANT_S6000
76 bool "s6000 - Stretch software configurable processor"
77 select VARIANT_IRQ_SWITCH
78 select ARCH_REQUIRE_GPIOLIB
79 select XTENSA_CALIBRATE_CCOUNT
82 config XTENSA_UNALIGNED_USER
83 bool "Unaligned memory access in use space"
85 The Xtensa architecture currently does not handle unaligned
86 memory accesses in hardware but through an exception handler.
87 Per default, unaligned memory accesses are disabled in user space.
89 Say Y here to enable unaligned memory access in user space.
91 source "kernel/Kconfig.preempt"
96 Can we use information of configuration file?
100 config XTENSA_CALIBRATE_CCOUNT
103 On some platforms (XT2000, for example), the CPU clock rate can
104 vary. The frequency can be determined, however, by measuring
105 against a well known, fixed frequency, such as an UART oscillator.
107 config SERIAL_CONSOLE
110 config XTENSA_ISS_NETWORK
119 Find out whether you have a PCI motherboard. PCI is the name of a
120 bus system, i.e. the way the CPU talks to the other stuff inside
121 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
122 VESA. If you have PCI, say Y, otherwise N.
124 source "drivers/pci/Kconfig"
128 menu "Platform options"
131 prompt "Xtensa System Type"
132 default XTENSA_PLATFORM_ISS
134 config XTENSA_PLATFORM_ISS
136 select XTENSA_CALIBRATE_CCOUNT
137 select SERIAL_CONSOLE
138 select XTENSA_ISS_NETWORK
140 ISS is an acronym for Tensilica's Instruction Set Simulator.
142 config XTENSA_PLATFORM_XT2000
145 XT2000 is the name of Tensilica's feature-rich emulation platform.
146 This hardware is capable of running a full Linux distribution.
148 config XTENSA_PLATFORM_S6105
150 select SERIAL_CONSOLE
153 config XTENSA_PLATFORM_XTFPGA
155 select SERIAL_CONSOLE
157 select XTENSA_CALIBRATE_CCOUNT
159 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
160 This hardware is capable of running a full Linux distribution.
165 config XTENSA_CPU_CLOCK
166 int "CPU clock rate [MHz]"
167 depends on !XTENSA_CALIBRATE_CCOUNT
170 config GENERIC_CALIBRATE_DELAY
171 bool "Auto calibration of the BogoMIPS value"
173 The BogoMIPS value can easily be derived from the CPU frequency.
176 bool "Default bootloader kernel arguments"
179 string "Initial kernel command string"
180 depends on CMDLINE_BOOL
181 default "console=ttyS0,38400 root=/dev/ram"
183 On some architectures (EBSA110 and CATS), there is currently no way
184 for the boot loader to pass arguments to the kernel. For these
185 architectures, you should supply some command-line options at build
186 time by entering them here. As a minimum, you should specify the
187 memory size and the root device (e.g., mem=64M root=/dev/nfs).
190 bool "Flattened Device Tree support"
192 select OF_EARLY_FLATTREE
194 Include support for flattened device tree machine descriptions.
197 string "DTB to build into the kernel image"
202 source "drivers/pcmcia/Kconfig"
204 source "drivers/pci/hotplug/Kconfig"
208 menu "Executable file formats"
215 If you enabled support for /proc file system then the file
216 /proc/kcore will contain the kernel core image in ELF format. This
219 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
221 This is especially useful if you have compiled the kernel with the
222 "-g" option to preserve debugging information. It is mainly used
223 for examining kernel data structures on the live kernel.
225 source "fs/Kconfig.binfmt"
231 source "drivers/Kconfig"
235 source "arch/xtensa/Kconfig.debug"
237 source "security/Kconfig"
239 source "crypto/Kconfig"