10 select HAVE_GENERIC_HARDIRQS
11 select GENERIC_IRQ_SHOW
12 select GENERIC_CPU_DEVICES
14 Xtensa processors are 32-bit RISC machines designed by Tensilica
15 primarily for embedded systems. These processors are both
16 configurable and extensible. The Linux port to the Xtensa
17 architecture supports all processor configurations and extensions,
18 with reasonable minimum requirements. The Xtensa Linux project has
19 a home page at <http://xtensa.sourceforge.net/>.
21 config RWSEM_XCHGADD_ALGORITHM
24 config GENERIC_HWEIGHT
30 config ARCH_HAS_ILOG2_U32
33 config ARCH_HAS_ILOG2_U64
44 source "kernel/Kconfig.freezer"
49 config VARIANT_IRQ_SWITCH
52 menu "Processor type and features"
55 prompt "Xtensa Processor Configuration"
56 default XTENSA_VARIANT_FSF
58 config XTENSA_VARIANT_FSF
59 bool "fsf - default (not generic) configuration"
62 config XTENSA_VARIANT_DC232B
63 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
66 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
68 config XTENSA_VARIANT_S6000
69 bool "s6000 - Stretch software configurable processor"
70 select VARIANT_IRQ_SWITCH
71 select ARCH_REQUIRE_GPIOLIB
72 select XTENSA_CALIBRATE_CCOUNT
75 config XTENSA_UNALIGNED_USER
76 bool "Unaligned memory access in use space"
78 The Xtensa architecture currently does not handle unaligned
79 memory accesses in hardware but through an exception handler.
80 Per default, unaligned memory accesses are disabled in user space.
82 Say Y here to enable unaligned memory access in user space.
84 source "kernel/Kconfig.preempt"
89 Can we use information of configuration file?
93 config XTENSA_CALIBRATE_CCOUNT
96 On some platforms (XT2000, for example), the CPU clock rate can
97 vary. The frequency can be determined, however, by measuring
98 against a well known, fixed frequency, such as an UART oscillator.
100 config SERIAL_CONSOLE
103 config XTENSA_ISS_NETWORK
112 Find out whether you have a PCI motherboard. PCI is the name of a
113 bus system, i.e. the way the CPU talks to the other stuff inside
114 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
115 VESA. If you have PCI, say Y, otherwise N.
117 source "drivers/pci/Kconfig"
121 menu "Platform options"
124 prompt "Xtensa System Type"
125 default XTENSA_PLATFORM_ISS
127 config XTENSA_PLATFORM_ISS
129 select XTENSA_CALIBRATE_CCOUNT
130 select SERIAL_CONSOLE
131 select XTENSA_ISS_NETWORK
133 ISS is an acronym for Tensilica's Instruction Set Simulator.
135 config XTENSA_PLATFORM_XT2000
138 XT2000 is the name of Tensilica's feature-rich emulation platform.
139 This hardware is capable of running a full Linux distribution.
141 config XTENSA_PLATFORM_S6105
143 select SERIAL_CONSOLE
148 config XTENSA_CPU_CLOCK
149 int "CPU clock rate [MHz]"
150 depends on !XTENSA_CALIBRATE_CCOUNT
153 config GENERIC_CALIBRATE_DELAY
154 bool "Auto calibration of the BogoMIPS value"
156 The BogoMIPS value can easily be derived from the CPU frequency.
159 bool "Default bootloader kernel arguments"
162 string "Initial kernel command string"
163 depends on CMDLINE_BOOL
164 default "console=ttyS0,38400 root=/dev/ram"
166 On some architectures (EBSA110 and CATS), there is currently no way
167 for the boot loader to pass arguments to the kernel. For these
168 architectures, you should supply some command-line options at build
169 time by entering them here. As a minimum, you should specify the
170 memory size and the root device (e.g., mem=64M root=/dev/nfs).
175 bool "Support for hot-pluggable devices"
177 Say Y here if you want to plug devices into your computer while
178 the system is running, and be able to use them quickly. In many
179 cases, the devices can likewise be unplugged at any time too.
181 One well known example of this is PCMCIA- or PC-cards, credit-card
182 size devices such as network cards, modems or hard drives which are
183 plugged into slots found on all modern laptop computers. Another
184 example, used on modern desktops as well as laptops, is USB.
186 Enable HOTPLUG and build a modular kernel. Get agent software
187 (from <http://linux-hotplug.sourceforge.net/>) and install it.
188 Then your kernel will automatically call out to a user mode "policy
189 agent" (/sbin/hotplug) to load modules and set up software needed
190 to use devices as you hotplug them.
192 source "drivers/pcmcia/Kconfig"
194 source "drivers/pci/hotplug/Kconfig"
198 menu "Executable file formats"
205 If you enabled support for /proc file system then the file
206 /proc/kcore will contain the kernel core image in ELF format. This
209 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
211 This is especially useful if you have compiled the kernel with the
212 "-g" option to preserve debugging information. It is mainly used
213 for examining kernel data structures on the live kernel.
215 source "fs/Kconfig.binfmt"
221 source "drivers/Kconfig"
225 menu "Xtensa initrd options"
226 depends on BLK_DEV_INITRD
228 config EMBEDDED_RAMDISK
229 bool "Embed root filesystem ramdisk into the kernel"
231 config EMBEDDED_RAMDISK_IMAGE
232 string "Filename of gzipped ramdisk image"
233 depends on EMBEDDED_RAMDISK
236 This is the filename of the ramdisk image to be built into the
237 kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
238 The ramdisk image is not part of the kernel distribution; you must
239 provide one yourself.
242 source "arch/xtensa/Kconfig.debug"
244 source "security/Kconfig"
246 source "crypto/Kconfig"