summaryrefslogtreecommitdiffstats
path: root/arch/xtensa
diff options
context:
space:
mode:
authorJohannes Weiner <jw@emlix.com>2009-03-04 16:21:28 +0100
committerChris Zankel <chris@zankel.net>2009-04-02 23:38:35 -0700
commit35f9cd083b350ad4eb3b5f159c7738fa9ddff40a (patch)
tree61d12098ad66fce1cb8a957881440c8e1998b46b /arch/xtensa
parent4f682fbb27deb308ca6a1e24ec9c2be41e6d1026 (diff)
downloadop-kernel-dev-35f9cd083b350ad4eb3b5f159c7738fa9ddff40a.zip
op-kernel-dev-35f9cd083b350ad4eb3b5f159c7738fa9ddff40a.tar.gz
xtensa: beat Kconfig into shape
Instead of making support code depend on variants or platforms, the latter should select what they need explicitely. Otherwise this starts looking weird when support code depends on !XTENSA_PLATFORM_FOO && !XTENSA_PLATFORM_BAR etc. This also includes some minor fixlets like converting bool and default to def_bool and fixing indentation and whitespace errors. Signed-off-by: Johannes Weiner <jw@emlix.com> Signed-off-by: Chris Zankel <chris@zankel.net>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/Kconfig166
1 files changed, 78 insertions, 88 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 9812008..cf2501b 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -4,16 +4,13 @@
mainmenu "Linux/Xtensa Kernel Configuration"
config FRAME_POINTER
- bool
- default n
+ def_bool n
config ZONE_DMA
- bool
- default y
+ def_bool y
config XTENSA
- bool
- default y
+ def_bool y
select HAVE_IDE
help
Xtensa processors are 32-bit RISC machines designed by Tensilica
@@ -24,28 +21,22 @@ config XTENSA
a home page at <http://xtensa.sourceforge.net/>.
config RWSEM_XCHGADD_ALGORITHM
- bool
- default y
+ def_bool y
config GENERIC_FIND_NEXT_BIT
- bool
- default y
+ def_bool y
config GENERIC_HWEIGHT
- bool
- default y
+ def_bool y
config GENERIC_HARDIRQS
- bool
- default y
+ def_bool y
config ARCH_HAS_ILOG2_U32
- bool
- default n
+ def_bool n
config ARCH_HAS_ILOG2_U64
- bool
- default n
+ def_bool n
config NO_IOPORT
def_bool y
@@ -57,6 +48,9 @@ config HZ
source "init/Kconfig"
source "kernel/Kconfig.freezer"
+config MMU
+ def_bool n
+
menu "Processor type and features"
choice
@@ -65,38 +59,36 @@ choice
config XTENSA_VARIANT_FSF
bool "fsf - default (not generic) configuration"
+ select MMU
config XTENSA_VARIANT_DC232B
bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
+ select MMU
help
- This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
+ This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
endchoice
-config MMU
- bool
- default y
-
config XTENSA_UNALIGNED_USER
bool "Unaligned memory access in use space"
- ---help---
- The Xtensa architecture currently does not handle unaligned
- memory accesses in hardware but through an exception handler.
- Per default, unaligned memory accesses are disabled in user space.
+ help
+ The Xtensa architecture currently does not handle unaligned
+ memory accesses in hardware but through an exception handler.
+ Per default, unaligned memory accesses are disabled in user space.
- Say Y here to enable unaligned memory access in user space.
+ Say Y here to enable unaligned memory access in user space.
config PREEMPT
bool "Preemptible Kernel"
- ---help---
- This option reduces the latency of the kernel when reacting to
- real-time or interactive events by allowing a low priority process to
- be preempted even if it is in kernel mode executing a system call.
- Unfortunately the kernel code has some race conditions if both
- CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
- currently disabled if you are building an SMP kernel.
+ help
+ This option reduces the latency of the kernel when reacting to
+ real-time or interactive events by allowing a low priority process to
+ be preempted even if it is in kernel mode executing a system call.
+ Unfortunately the kernel code has some race conditions if both
+ CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
+ currently disabled if you are building an SMP kernel.
- Say Y here if you are building a kernel for a desktop, embedded
- or real-time system. Say N if you are unsure.
+ Say Y here if you are building a kernel for a desktop, embedded
+ or real-time system. Say N if you are unsure.
config MATH_EMULATION
bool "Math emulation"
@@ -105,6 +97,32 @@ config MATH_EMULATION
endmenu
+config XTENSA_CALIBRATE_CCOUNT
+ def_bool n
+ help
+ On some platforms (XT2000, for example), the CPU clock rate can
+ vary. The frequency can be determined, however, by measuring
+ against a well known, fixed frequency, such as an UART oscillator.
+
+config SERIAL_CONSOLE
+ def_bool n
+
+config XTENSA_ISS_NETWORK
+ def_bool n
+
+menu "Bus options"
+
+config PCI
+ bool "PCI support"
+ default y
+ help
+ Find out whether you have a PCI motherboard. PCI is the name of a
+ bus system, i.e. the way the CPU talks to the other stuff inside
+ your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
+ VESA. If you have PCI, say Y, otherwise N.
+
+source "drivers/pci/Kconfig"
+
menu "Platform options"
choice
@@ -113,11 +131,16 @@ choice
config XTENSA_PLATFORM_ISS
bool "ISS"
+ select XTENSA_CALIBRATE_CCOUNT
+ select SERIAL_CONSOLE
+ select XTENSA_ISS_NETWORK
help
ISS is an acronym for Tensilica's Instruction Set Simulator.
config XTENSA_PLATFORM_XT2000
bool "XT2000"
+ select XTENSA_CALIBRATE_CCOUNT
+ select PCI
help
XT2000 is the name of Tensilica's feature-rich emulation platform.
This hardware is capable of running a full Linux distribution.
@@ -125,21 +148,14 @@ config XTENSA_PLATFORM_XT2000
endchoice
-config XTENSA_CALIBRATE_CCOUNT
- bool "Auto calibration of the CPU clock rate"
- ---help---
- On some platforms (XT2000, for example), the CPU clock rate can
- vary. The frequency can be determined, however, by measuring
- against a well known, fixed frequency, such as an UART oscillator.
-
config XTENSA_CPU_CLOCK
int "CPU clock rate [MHz]"
depends on !XTENSA_CALIBRATE_CCOUNT
- default "16"
+ default 16
config GENERIC_CALIBRATE_DELAY
bool "Auto calibration of the BogoMIPS value"
- ---help---
+ help
The BogoMIPS value can easily be derived from the CPU frequency.
config CMDLINE_BOOL
@@ -156,52 +172,27 @@ config CMDLINE
time by entering them here. As a minimum, you should specify the
memory size and the root device (e.g., mem=64M root=/dev/nfs).
-config SERIAL_CONSOLE
- bool
- depends on XTENSA_PLATFORM_ISS
- default y
-
-config XTENSA_ISS_NETWORK
- bool
- depends on XTENSA_PLATFORM_ISS
- default y
-
source "mm/Kconfig"
endmenu
-menu "Bus options"
-
-config PCI
- bool "PCI support" if !XTENSA_PLATFORM_ISS
- depends on !XTENSA_PLATFORM_ISS
- default y
+config HOTPLUG
+ bool "Support for hot-pluggable devices"
help
- Find out whether you have a PCI motherboard. PCI is the name of a
- bus system, i.e. the way the CPU talks to the other stuff inside
- your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
- VESA. If you have PCI, say Y, otherwise N.
-
-source "drivers/pci/Kconfig"
+ Say Y here if you want to plug devices into your computer while
+ the system is running, and be able to use them quickly. In many
+ cases, the devices can likewise be unplugged at any time too.
-config HOTPLUG
+ One well known example of this is PCMCIA- or PC-cards, credit-card
+ size devices such as network cards, modems or hard drives which are
+ plugged into slots found on all modern laptop computers. Another
+ example, used on modern desktops as well as laptops, is USB.
- bool "Support for hot-pluggable devices"
- ---help---
- Say Y here if you want to plug devices into your computer while
- the system is running, and be able to use them quickly. In many
- cases, the devices can likewise be unplugged at any time too.
-
- One well known example of this is PCMCIA- or PC-cards, credit-card
- size devices such as network cards, modems or hard drives which are
- plugged into slots found on all modern laptop computers. Another
- example, used on modern desktops as well as laptops, is USB.
-
- Enable HOTPLUG and build a modular kernel. Get agent software
- (from <http://linux-hotplug.sourceforge.net/>) and install it.
- Then your kernel will automatically call out to a user mode "policy
- agent" (/sbin/hotplug) to load modules and set up software needed
- to use devices as you hotplug them.
+ Enable HOTPLUG and build a modular kernel. Get agent software
+ (from <http://linux-hotplug.sourceforge.net/>) and install it.
+ Then your kernel will automatically call out to a user mode "policy
+ agent" (/sbin/hotplug) to load modules and set up software needed
+ to use devices as you hotplug them.
source "drivers/pcmcia/Kconfig"
@@ -213,9 +204,8 @@ menu "Executable file formats"
# only elf supported
config KCORE_ELF
- bool
+ def_bool y
depends on PROC_FS
- default y
help
If you enabled support for /proc file system then the file
/proc/kcore will contain the kernel core image in ELF format. This
@@ -240,7 +230,7 @@ source "fs/Kconfig"
menu "Xtensa initrd options"
depends on BLK_DEV_INITRD
- config EMBEDDED_RAMDISK
+config EMBEDDED_RAMDISK
bool "Embed root filesystem ramdisk into the kernel"
config EMBEDDED_RAMDISK_IMAGE
OpenPOWER on IntegriCloud