10 select HAVE_GENERIC_HARDIRQS
11 select GENERIC_IRQ_SHOW
13 Xtensa processors are 32-bit RISC machines designed by Tensilica
14 primarily for embedded systems. These processors are both
15 configurable and extensible. The Linux port to the Xtensa
16 architecture supports all processor configurations and extensions,
17 with reasonable minimum requirements. The Xtensa Linux project has
18 a home page at <http://xtensa.sourceforge.net/>.
20 config RWSEM_XCHGADD_ALGORITHM
23 config GENERIC_HWEIGHT
29 config ARCH_HAS_ILOG2_U32
32 config ARCH_HAS_ILOG2_U64
43 source "kernel/Kconfig.freezer"
48 config VARIANT_IRQ_SWITCH
51 menu "Processor type and features"
54 prompt "Xtensa Processor Configuration"
55 default XTENSA_VARIANT_FSF
57 config XTENSA_VARIANT_FSF
58 bool "fsf - default (not generic) configuration"
61 config XTENSA_VARIANT_DC232B
62 bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
65 This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
67 config XTENSA_VARIANT_S6000
68 bool "s6000 - Stretch software configurable processor"
69 select VARIANT_IRQ_SWITCH
70 select ARCH_REQUIRE_GPIOLIB
71 select XTENSA_CALIBRATE_CCOUNT
74 config XTENSA_UNALIGNED_USER
75 bool "Unaligned memory access in use space"
77 The Xtensa architecture currently does not handle unaligned
78 memory accesses in hardware but through an exception handler.
79 Per default, unaligned memory accesses are disabled in user space.
81 Say Y here to enable unaligned memory access in user space.
83 source "kernel/Kconfig.preempt"
88 Can we use information of configuration file?
92 config XTENSA_CALIBRATE_CCOUNT
95 On some platforms (XT2000, for example), the CPU clock rate can
96 vary. The frequency can be determined, however, by measuring
97 against a well known, fixed frequency, such as an UART oscillator.
102 config XTENSA_ISS_NETWORK
111 Find out whether you have a PCI motherboard. PCI is the name of a
112 bus system, i.e. the way the CPU talks to the other stuff inside
113 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
114 VESA. If you have PCI, say Y, otherwise N.
116 source "drivers/pci/Kconfig"
120 menu "Platform options"
123 prompt "Xtensa System Type"
124 default XTENSA_PLATFORM_ISS
126 config XTENSA_PLATFORM_ISS
128 select XTENSA_CALIBRATE_CCOUNT
129 select SERIAL_CONSOLE
130 select XTENSA_ISS_NETWORK
132 ISS is an acronym for Tensilica's Instruction Set Simulator.
134 config XTENSA_PLATFORM_XT2000
137 XT2000 is the name of Tensilica's feature-rich emulation platform.
138 This hardware is capable of running a full Linux distribution.
140 config XTENSA_PLATFORM_S6105
142 select SERIAL_CONSOLE
147 config XTENSA_CPU_CLOCK
148 int "CPU clock rate [MHz]"
149 depends on !XTENSA_CALIBRATE_CCOUNT
152 config GENERIC_CALIBRATE_DELAY
153 bool "Auto calibration of the BogoMIPS value"
155 The BogoMIPS value can easily be derived from the CPU frequency.
158 bool "Default bootloader kernel arguments"
161 string "Initial kernel command string"
162 depends on CMDLINE_BOOL
163 default "console=ttyS0,38400 root=/dev/ram"
165 On some architectures (EBSA110 and CATS), there is currently no way
166 for the boot loader to pass arguments to the kernel. For these
167 architectures, you should supply some command-line options at build
168 time by entering them here. As a minimum, you should specify the
169 memory size and the root device (e.g., mem=64M root=/dev/nfs).
174 bool "Support for hot-pluggable devices"
176 Say Y here if you want to plug devices into your computer while
177 the system is running, and be able to use them quickly. In many
178 cases, the devices can likewise be unplugged at any time too.
180 One well known example of this is PCMCIA- or PC-cards, credit-card
181 size devices such as network cards, modems or hard drives which are
182 plugged into slots found on all modern laptop computers. Another
183 example, used on modern desktops as well as laptops, is USB.
185 Enable HOTPLUG and build a modular kernel. Get agent software
186 (from <http://linux-hotplug.sourceforge.net/>) and install it.
187 Then your kernel will automatically call out to a user mode "policy
188 agent" (/sbin/hotplug) to load modules and set up software needed
189 to use devices as you hotplug them.
191 source "drivers/pcmcia/Kconfig"
193 source "drivers/pci/hotplug/Kconfig"
197 menu "Executable file formats"
204 If you enabled support for /proc file system then the file
205 /proc/kcore will contain the kernel core image in ELF format. This
208 $ cd /usr/src/linux ; gdb vmlinux /proc/kcore
210 This is especially useful if you have compiled the kernel with the
211 "-g" option to preserve debugging information. It is mainly used
212 for examining kernel data structures on the live kernel.
214 source "fs/Kconfig.binfmt"
220 source "drivers/Kconfig"
224 menu "Xtensa initrd options"
225 depends on BLK_DEV_INITRD
227 config EMBEDDED_RAMDISK
228 bool "Embed root filesystem ramdisk into the kernel"
230 config EMBEDDED_RAMDISK_IMAGE
231 string "Filename of gzipped ramdisk image"
232 depends on EMBEDDED_RAMDISK
235 This is the filename of the ramdisk image to be built into the
236 kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
237 The ramdisk image is not part of the kernel distribution; you must
238 provide one yourself.
241 source "arch/xtensa/Kconfig.debug"
243 source "security/Kconfig"
245 source "crypto/Kconfig"