2005-06-24 05:01:10 +00:00
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config FRAME_POINTER
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2009-03-04 15:21:28 +00:00
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def_bool n
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2005-06-24 05:01:10 +00:00
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2007-02-10 09:43:09 +00:00
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config ZONE_DMA
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2009-03-04 15:21:28 +00:00
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def_bool y
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2007-02-10 09:43:09 +00:00
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2005-06-24 05:01:10 +00:00
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config XTENSA
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2009-03-04 15:21:28 +00:00
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def_bool y
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2008-02-09 09:46:40 +00:00
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select HAVE_IDE
|
2012-07-31 23:41:33 +00:00
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select GENERIC_ATOMIC64
|
2011-02-06 21:10:54 +00:00
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select HAVE_GENERIC_HARDIRQS
|
2011-03-24 17:28:40 +00:00
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select GENERIC_IRQ_SHOW
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2012-01-10 03:04:32 +00:00
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select GENERIC_CPU_DEVICES
|
2012-09-17 01:44:40 +00:00
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select MODULES_USE_ELF_RELA
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select GENERIC_PCI_IOMAP
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2012-09-17 01:44:42 +00:00
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select ARCH_WANT_OPTIONAL_GPIOLIB
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2005-06-24 05:01:10 +00:00
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help
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Xtensa processors are 32-bit RISC machines designed by Tensilica
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primarily for embedded systems. These processors are both
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configurable and extensible. The Linux port to the Xtensa
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architecture supports all processor configurations and extensions,
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with reasonable minimum requirements. The Xtensa Linux project has
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2013-01-04 08:29:18 +00:00
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a home page at <http://www.linux-xtensa.org/>.
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2005-06-24 05:01:10 +00:00
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config RWSEM_XCHGADD_ALGORITHM
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2009-03-04 15:21:28 +00:00
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def_bool y
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2005-06-24 05:01:10 +00:00
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[PATCH] bitops: xtensa: use generic bitops
- remove {,test_and_}{set,clear,change}_bit()
- remove __{,test_and_}{set,clear,change}_bit() and test_bit()
- remove generic_fls64()
- remove find_{next,first}{,_zero}_bit()
- remove ext2_{set,clear,test,find_first_zero,find_next_zero}_bit()
- remove generic_hweight{32,16,8}()
- remove sched_find_first_bit()
- remove minix_{test,set,test_and_clear,test,find_first_zero}_bit()
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-26 09:39:43 +00:00
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config GENERIC_HWEIGHT
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2009-03-04 15:21:28 +00:00
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def_bool y
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[PATCH] bitops: xtensa: use generic bitops
- remove {,test_and_}{set,clear,change}_bit()
- remove __{,test_and_}{set,clear,change}_bit() and test_bit()
- remove generic_fls64()
- remove find_{next,first}{,_zero}_bit()
- remove ext2_{set,clear,test,find_first_zero,find_next_zero}_bit()
- remove generic_hweight{32,16,8}()
- remove sched_find_first_bit()
- remove minix_{test,set,test_and_clear,test,find_first_zero}_bit()
Signed-off-by: Akinobu Mita <mita@miraclelinux.com>
Cc: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-26 09:39:43 +00:00
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2009-03-04 15:21:32 +00:00
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config GENERIC_GPIO
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def_bool y
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2006-12-08 10:37:49 +00:00
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config ARCH_HAS_ILOG2_U32
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2009-03-04 15:21:28 +00:00
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def_bool n
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2006-12-08 10:37:49 +00:00
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config ARCH_HAS_ILOG2_U64
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2009-03-04 15:21:28 +00:00
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def_bool n
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2006-12-08 10:37:49 +00:00
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2007-02-11 15:41:31 +00:00
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config NO_IOPORT
|
2012-09-17 01:44:41 +00:00
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def_bool n
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2007-02-11 15:41:31 +00:00
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avoid overflows in kernel/time.c
When the conversion factor between jiffies and milli- or microseconds is
not a single multiply or divide, as for the case of HZ == 300, we currently
do a multiply followed by a divide. The intervening result, however, is
subject to overflows, especially since the fraction is not simplified (for
HZ == 300, we multiply by 300 and divide by 1000).
This is exposed to the user when passing a large timeout to poll(), for
example.
This patch replaces the multiply-divide with a reciprocal multiplication on
32-bit platforms. When the input is an unsigned long, there is no portable
way to do this on 64-bit platforms there is no portable way to do this
since it requires a 128-bit intermediate result (which gcc does support on
64-bit platforms but may generate libgcc calls, e.g. on 64-bit s390), but
since the output is a 32-bit integer in the cases affected, just simplify
the multiply-divide (*3/10 instead of *300/1000).
The reciprocal multiply used can have off-by-one errors in the upper half
of the valid output range. This could be avoided at the expense of having
to deal with a potential 65-bit intermediate result. Since the intent is
to avoid overflow problems and most of the other time conversions are only
semiexact, the off-by-one errors were considered an acceptable tradeoff.
At Ralf Baechle's suggestion, this version uses a Perl script to compute
the necessary constants. We already have dependencies on Perl for kernel
compiles. This does, however, require the Perl module Math::BigInt, which
is included in the standard Perl distribution starting with version 5.8.0.
In order to support older versions of Perl, include a table of canned
constants in the script itself, and structure the script so that
Math::BigInt isn't required if pulling values from said table.
Running the script requires that the HZ value is available from the
Makefile. Thus, this patch also adds the Kconfig variable CONFIG_HZ to the
architectures which didn't already have it (alpha, cris, frv, h8300, m32r,
m68k, m68knommu, sparc, v850, and xtensa.) It does *not* touch the sh or
sh64 architectures, since Paul Mundt has dealt with those separately in the
sh tree.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Ralf Baechle <ralf@linux-mips.org>,
Cc: Sam Ravnborg <sam@ravnborg.org>,
Cc: Paul Mundt <lethal@linux-sh.org>,
Cc: Richard Henderson <rth@twiddle.net>,
Cc: Michael Starvik <starvik@axis.com>,
Cc: David Howells <dhowells@redhat.com>,
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>,
Cc: Hirokazu Takata <takata@linux-m32r.org>,
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Cc: Roman Zippel <zippel@linux-m68k.org>,
Cc: William L. Irwin <sparclinux@vger.kernel.org>,
Cc: Chris Zankel <chris@zankel.net>,
Cc: H. Peter Anvin <hpa@zytor.com>,
Cc: Jan Engelhardt <jengelh@computergmbh.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-02-08 12:21:26 +00:00
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config HZ
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int
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default 100
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2005-06-24 05:01:10 +00:00
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source "init/Kconfig"
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2008-10-19 03:27:21 +00:00
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source "kernel/Kconfig.freezer"
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2005-06-24 05:01:10 +00:00
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2009-03-04 15:21:28 +00:00
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config MMU
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def_bool n
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2009-03-04 15:21:31 +00:00
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config VARIANT_IRQ_SWITCH
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def_bool n
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|
2005-06-24 05:01:10 +00:00
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menu "Processor type and features"
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choice
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prompt "Xtensa Processor Configuration"
|
2006-12-10 10:18:48 +00:00
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default XTENSA_VARIANT_FSF
|
2005-06-24 05:01:10 +00:00
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|
2006-12-10 10:18:48 +00:00
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config XTENSA_VARIANT_FSF
|
2008-10-21 16:11:43 +00:00
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bool "fsf - default (not generic) configuration"
|
2009-03-04 15:21:28 +00:00
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select MMU
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2008-10-21 16:11:43 +00:00
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config XTENSA_VARIANT_DC232B
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bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
|
2009-03-04 15:21:28 +00:00
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select MMU
|
2008-10-21 16:11:43 +00:00
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help
|
2009-03-04 15:21:28 +00:00
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This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
|
2009-03-04 15:21:32 +00:00
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config XTENSA_VARIANT_S6000
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bool "s6000 - Stretch software configurable processor"
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select VARIANT_IRQ_SWITCH
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select ARCH_REQUIRE_GPIOLIB
|
2009-05-11 13:43:36 +00:00
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select XTENSA_CALIBRATE_CCOUNT
|
2005-06-24 05:01:10 +00:00
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endchoice
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config XTENSA_UNALIGNED_USER
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bool "Unaligned memory access in use space"
|
2009-03-04 15:21:28 +00:00
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help
|
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|
The Xtensa architecture currently does not handle unaligned
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memory accesses in hardware but through an exception handler.
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Per default, unaligned memory accesses are disabled in user space.
|
2005-06-24 05:01:10 +00:00
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|
2009-03-04 15:21:28 +00:00
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Say Y here to enable unaligned memory access in user space.
|
2005-06-24 05:01:10 +00:00
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|
2011-07-05 15:45:34 +00:00
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source "kernel/Kconfig.preempt"
|
2005-06-24 05:01:10 +00:00
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config MATH_EMULATION
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bool "Math emulation"
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help
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Can we use information of configuration file?
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endmenu
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|
2009-03-04 15:21:28 +00:00
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config XTENSA_CALIBRATE_CCOUNT
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def_bool n
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help
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On some platforms (XT2000, for example), the CPU clock rate can
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vary. The frequency can be determined, however, by measuring
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against a well known, fixed frequency, such as an UART oscillator.
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config SERIAL_CONSOLE
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def_bool n
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config XTENSA_ISS_NETWORK
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def_bool n
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menu "Bus options"
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config PCI
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bool "PCI support"
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default y
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help
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Find out whether you have a PCI motherboard. PCI is the name of a
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bus system, i.e. the way the CPU talks to the other stuff inside
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your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
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VESA. If you have PCI, say Y, otherwise N.
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source "drivers/pci/Kconfig"
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|
2009-04-16 07:25:39 +00:00
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endmenu
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|
2005-06-24 05:01:10 +00:00
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menu "Platform options"
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choice
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prompt "Xtensa System Type"
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default XTENSA_PLATFORM_ISS
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config XTENSA_PLATFORM_ISS
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bool "ISS"
|
2009-03-04 15:21:28 +00:00
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select XTENSA_CALIBRATE_CCOUNT
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select SERIAL_CONSOLE
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select XTENSA_ISS_NETWORK
|
2005-06-24 05:01:10 +00:00
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help
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ISS is an acronym for Tensilica's Instruction Set Simulator.
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config XTENSA_PLATFORM_XT2000
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bool "XT2000"
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help
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XT2000 is the name of Tensilica's feature-rich emulation platform.
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This hardware is capable of running a full Linux distribution.
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|
2009-03-04 15:21:33 +00:00
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config XTENSA_PLATFORM_S6105
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bool "S6105"
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select SERIAL_CONSOLE
|
2012-09-17 01:44:41 +00:00
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select NO_IOPORT
|
2009-03-04 15:21:33 +00:00
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|
2005-06-24 05:01:10 +00:00
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endchoice
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config XTENSA_CPU_CLOCK
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int "CPU clock rate [MHz]"
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depends on !XTENSA_CALIBRATE_CCOUNT
|
2009-03-04 15:21:28 +00:00
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default 16
|
2005-06-24 05:01:10 +00:00
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config GENERIC_CALIBRATE_DELAY
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bool "Auto calibration of the BogoMIPS value"
|
2009-03-04 15:21:28 +00:00
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help
|
2005-06-30 09:58:58 +00:00
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The BogoMIPS value can easily be derived from the CPU frequency.
|
2005-06-24 05:01:10 +00:00
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyS0,38400 root=/dev/ram"
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help
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|
On some architectures (EBSA110 and CATS), there is currently no way
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|
for the boot loader to pass arguments to the kernel. For these
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architectures, you should supply some command-line options at build
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time by entering them here. As a minimum, you should specify the
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memory size and the root device (e.g., mem=64M root=/dev/nfs).
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|
2005-06-30 09:58:58 +00:00
|
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source "mm/Kconfig"
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|
2005-06-24 05:01:10 +00:00
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|
|
source "drivers/pcmcia/Kconfig"
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source "drivers/pci/hotplug/Kconfig"
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endmenu
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|
2006-10-03 20:36:44 +00:00
|
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|
menu "Executable file formats"
|
2005-06-24 05:01:10 +00:00
|
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# only elf supported
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config KCORE_ELF
|
2009-03-04 15:21:28 +00:00
|
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def_bool y
|
2005-06-24 05:01:10 +00:00
|
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depends on PROC_FS
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help
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|
If you enabled support for /proc file system then the file
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/proc/kcore will contain the kernel core image in ELF format. This
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can be used in gdb:
|
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|
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|
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$ cd /usr/src/linux ; gdb vmlinux /proc/kcore
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This is especially useful if you have compiled the kernel with the
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"-g" option to preserve debugging information. It is mainly used
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for examining kernel data structures on the live kernel.
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source "fs/Kconfig.binfmt"
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endmenu
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|
2005-07-12 04:03:49 +00:00
|
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source "net/Kconfig"
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|
2005-06-24 05:01:10 +00:00
|
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "arch/xtensa/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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