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 GENERIC_KERNEL_THREAD
17 select GENERIC_KERNEL_EXECVE
18 select ARCH_WANT_OPTIONAL_GPIOLIB
19 select CLONE_BACKWARDS
22 Xtensa processors are 32-bit RISC machines designed by Tensilica
23 primarily for embedded systems. These processors are both
24 configurable and extensible. The Linux port to the Xtensa
25 architecture supports all processor configurations and extensions,
26 with reasonable minimum requirements. The Xtensa Linux project has
27 a home page at <http://xtensa.sourceforge.net/>.
29 config RWSEM_XCHGADD_ALGORITHM
32 config GENERIC_HWEIGHT
38 config ARCH_HAS_ILOG2_U32
41 config ARCH_HAS_ILOG2_U64
52 source "kernel/Kconfig.freezer"
57 config VARIANT_IRQ_SWITCH
60 menu "Processor type and features"
63 prompt "Xtensa Processor Configuration"
64 default XTENSA_VARIANT_FSF
66 config XTENSA_VARIANT_FSF
67 bool "fsf - default (not generic) configuration"
70 config XTENSA_VARIANT_DC232B
71 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
74 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
76 config XTENSA_VARIANT_S6000
77 bool "s6000 - Stretch software configurable processor"
78 select VARIANT_IRQ_SWITCH
79 select ARCH_REQUIRE_GPIOLIB
80 select XTENSA_CALIBRATE_CCOUNT
83 config XTENSA_UNALIGNED_USER
84 bool "Unaligned memory access in use space"
86 The Xtensa architecture currently does not handle unaligned
87 memory accesses in hardware but through an exception handler.
88 Per default, unaligned memory accesses are disabled in user space.
90 Say Y here to enable unaligned memory access in user space.
92 source "kernel/Kconfig.preempt"
97 Can we use information of configuration file?
101 config XTENSA_CALIBRATE_CCOUNT
104 On some platforms (XT2000, for example), the CPU clock rate can
105 vary. The frequency can be determined, however, by measuring
106 against a well known, fixed frequency, such as an UART oscillator.
108 config SERIAL_CONSOLE
111 config XTENSA_ISS_NETWORK
120 Find out whether you have a PCI motherboard. PCI is the name of a
121 bus system, i.e. the way the CPU talks to the other stuff inside
122 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
123 VESA. If you have PCI, say Y, otherwise N.
125 source "drivers/pci/Kconfig"
129 menu "Platform options"
132 prompt "Xtensa System Type"
133 default XTENSA_PLATFORM_ISS
135 config XTENSA_PLATFORM_ISS
137 select XTENSA_CALIBRATE_CCOUNT
138 select SERIAL_CONSOLE
139 select XTENSA_ISS_NETWORK
141 ISS is an acronym for Tensilica's Instruction Set Simulator.
143 config XTENSA_PLATFORM_XT2000
146 XT2000 is the name of Tensilica's feature-rich emulation platform.
147 This hardware is capable of running a full Linux distribution.
149 config XTENSA_PLATFORM_S6105
151 select SERIAL_CONSOLE
154 config XTENSA_PLATFORM_XTFPGA
156 select SERIAL_CONSOLE
158 select XTENSA_CALIBRATE_CCOUNT
160 XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
161 This hardware is capable of running a full Linux distribution.
166 config XTENSA_CPU_CLOCK
167 int "CPU clock rate [MHz]"
168 depends on !XTENSA_CALIBRATE_CCOUNT
171 config GENERIC_CALIBRATE_DELAY
172 bool "Auto calibration of the BogoMIPS value"
174 The BogoMIPS value can easily be derived from the CPU frequency.
177 bool "Default bootloader kernel arguments"
180 string "Initial kernel command string"
181 depends on CMDLINE_BOOL
182 default "console=ttyS0,38400 root=/dev/ram"
184 On some architectures (EBSA110 and CATS), there is currently no way
185 for the boot loader to pass arguments to the kernel. For these
186 architectures, you should supply some command-line options at build
187 time by entering them here. As a minimum, you should specify the
188 memory size and the root device (e.g., mem=64M root=/dev/nfs).
191 bool "Flattened Device Tree support"
193 select OF_EARLY_FLATTREE
195 Include support for flattened device tree machine descriptions.
198 string "DTB to build into the kernel image"
203 source "drivers/pcmcia/Kconfig"
205 source "drivers/pci/hotplug/Kconfig"
209 menu "Executable file formats"
216 If you enabled support for /proc file system then the file
217 /proc/kcore will contain the kernel core image in ELF format. This
220 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
222 This is especially useful if you have compiled the kernel with the
223 "-g" option to preserve debugging information. It is mainly used
224 for examining kernel data structures on the live kernel.
226 source "fs/Kconfig.binfmt"
232 source "drivers/Kconfig"
236 source "arch/xtensa/Kconfig.debug"
238 source "security/Kconfig"
240 source "crypto/Kconfig"