diff options
Diffstat (limited to 'arch/xtensa')
-rw-r--r-- | arch/xtensa/Kconfig | 166 |
1 files changed, 78 insertions, 88 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 981200830432..cf2501b5afd4 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig | |||
@@ -4,16 +4,13 @@ | |||
4 | mainmenu "Linux/Xtensa Kernel Configuration" | 4 | mainmenu "Linux/Xtensa Kernel Configuration" |
5 | 5 | ||
6 | config FRAME_POINTER | 6 | config FRAME_POINTER |
7 | bool | 7 | def_bool n |
8 | default n | ||
9 | 8 | ||
10 | config ZONE_DMA | 9 | config ZONE_DMA |
11 | bool | 10 | def_bool y |
12 | default y | ||
13 | 11 | ||
14 | config XTENSA | 12 | config XTENSA |
15 | bool | 13 | def_bool y |
16 | default y | ||
17 | select HAVE_IDE | 14 | select HAVE_IDE |
18 | help | 15 | help |
19 | Xtensa processors are 32-bit RISC machines designed by Tensilica | 16 | Xtensa processors are 32-bit RISC machines designed by Tensilica |
@@ -24,28 +21,22 @@ config XTENSA | |||
24 | a home page at <http://xtensa.sourceforge.net/>. | 21 | a home page at <http://xtensa.sourceforge.net/>. |
25 | 22 | ||
26 | config RWSEM_XCHGADD_ALGORITHM | 23 | config RWSEM_XCHGADD_ALGORITHM |
27 | bool | 24 | def_bool y |
28 | default y | ||
29 | 25 | ||
30 | config GENERIC_FIND_NEXT_BIT | 26 | config GENERIC_FIND_NEXT_BIT |
31 | bool | 27 | def_bool y |
32 | default y | ||
33 | 28 | ||
34 | config GENERIC_HWEIGHT | 29 | config GENERIC_HWEIGHT |
35 | bool | 30 | def_bool y |
36 | default y | ||
37 | 31 | ||
38 | config GENERIC_HARDIRQS | 32 | config GENERIC_HARDIRQS |
39 | bool | 33 | def_bool y |
40 | default y | ||
41 | 34 | ||
42 | config ARCH_HAS_ILOG2_U32 | 35 | config ARCH_HAS_ILOG2_U32 |
43 | bool | 36 | def_bool n |
44 | default n | ||
45 | 37 | ||
46 | config ARCH_HAS_ILOG2_U64 | 38 | config ARCH_HAS_ILOG2_U64 |
47 | bool | 39 | def_bool n |
48 | default n | ||
49 | 40 | ||
50 | config NO_IOPORT | 41 | config NO_IOPORT |
51 | def_bool y | 42 | def_bool y |
@@ -57,6 +48,9 @@ config HZ | |||
57 | source "init/Kconfig" | 48 | source "init/Kconfig" |
58 | source "kernel/Kconfig.freezer" | 49 | source "kernel/Kconfig.freezer" |
59 | 50 | ||
51 | config MMU | ||
52 | def_bool n | ||
53 | |||
60 | menu "Processor type and features" | 54 | menu "Processor type and features" |
61 | 55 | ||
62 | choice | 56 | choice |
@@ -65,38 +59,36 @@ choice | |||
65 | 59 | ||
66 | config XTENSA_VARIANT_FSF | 60 | config XTENSA_VARIANT_FSF |
67 | bool "fsf - default (not generic) configuration" | 61 | bool "fsf - default (not generic) configuration" |
62 | select MMU | ||
68 | 63 | ||
69 | config XTENSA_VARIANT_DC232B | 64 | config XTENSA_VARIANT_DC232B |
70 | bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" | 65 | bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" |
66 | select MMU | ||
71 | help | 67 | help |
72 | This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). | 68 | This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). |
73 | endchoice | 69 | endchoice |
74 | 70 | ||
75 | config MMU | ||
76 | bool | ||
77 | default y | ||
78 | |||
79 | config XTENSA_UNALIGNED_USER | 71 | config XTENSA_UNALIGNED_USER |
80 | bool "Unaligned memory access in use space" | 72 | bool "Unaligned memory access in use space" |
81 | ---help--- | 73 | help |
82 | The Xtensa architecture currently does not handle unaligned | 74 | The Xtensa architecture currently does not handle unaligned |
83 | memory accesses in hardware but through an exception handler. | 75 | memory accesses in hardware but through an exception handler. |
84 | Per default, unaligned memory accesses are disabled in user space. | 76 | Per default, unaligned memory accesses are disabled in user space. |
85 | 77 | ||
86 | Say Y here to enable unaligned memory access in user space. | 78 | Say Y here to enable unaligned memory access in user space. |
87 | 79 | ||
88 | config PREEMPT | 80 | config PREEMPT |
89 | bool "Preemptible Kernel" | 81 | bool "Preemptible Kernel" |
90 | ---help--- | 82 | help |
91 | This option reduces the latency of the kernel when reacting to | 83 | This option reduces the latency of the kernel when reacting to |
92 | real-time or interactive events by allowing a low priority process to | 84 | real-time or interactive events by allowing a low priority process to |
93 | be preempted even if it is in kernel mode executing a system call. | 85 | be preempted even if it is in kernel mode executing a system call. |
94 | Unfortunately the kernel code has some race conditions if both | 86 | Unfortunately the kernel code has some race conditions if both |
95 | CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is | 87 | CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is |
96 | currently disabled if you are building an SMP kernel. | 88 | currently disabled if you are building an SMP kernel. |
97 | 89 | ||
98 | Say Y here if you are building a kernel for a desktop, embedded | 90 | Say Y here if you are building a kernel for a desktop, embedded |
99 | or real-time system. Say N if you are unsure. | 91 | or real-time system. Say N if you are unsure. |
100 | 92 | ||
101 | config MATH_EMULATION | 93 | config MATH_EMULATION |
102 | bool "Math emulation" | 94 | bool "Math emulation" |
@@ -105,6 +97,32 @@ config MATH_EMULATION | |||
105 | 97 | ||
106 | endmenu | 98 | endmenu |
107 | 99 | ||
100 | config XTENSA_CALIBRATE_CCOUNT | ||
101 | def_bool n | ||
102 | help | ||
103 | On some platforms (XT2000, for example), the CPU clock rate can | ||
104 | vary. The frequency can be determined, however, by measuring | ||
105 | against a well known, fixed frequency, such as an UART oscillator. | ||
106 | |||
107 | config SERIAL_CONSOLE | ||
108 | def_bool n | ||
109 | |||
110 | config XTENSA_ISS_NETWORK | ||
111 | def_bool n | ||
112 | |||
113 | menu "Bus options" | ||
114 | |||
115 | config PCI | ||
116 | bool "PCI support" | ||
117 | default y | ||
118 | help | ||
119 | Find out whether you have a PCI motherboard. PCI is the name of a | ||
120 | bus system, i.e. the way the CPU talks to the other stuff inside | ||
121 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | ||
122 | VESA. If you have PCI, say Y, otherwise N. | ||
123 | |||
124 | source "drivers/pci/Kconfig" | ||
125 | |||
108 | menu "Platform options" | 126 | menu "Platform options" |
109 | 127 | ||
110 | choice | 128 | choice |
@@ -113,11 +131,16 @@ choice | |||
113 | 131 | ||
114 | config XTENSA_PLATFORM_ISS | 132 | config XTENSA_PLATFORM_ISS |
115 | bool "ISS" | 133 | bool "ISS" |
134 | select XTENSA_CALIBRATE_CCOUNT | ||
135 | select SERIAL_CONSOLE | ||
136 | select XTENSA_ISS_NETWORK | ||
116 | help | 137 | help |
117 | ISS is an acronym for Tensilica's Instruction Set Simulator. | 138 | ISS is an acronym for Tensilica's Instruction Set Simulator. |
118 | 139 | ||
119 | config XTENSA_PLATFORM_XT2000 | 140 | config XTENSA_PLATFORM_XT2000 |
120 | bool "XT2000" | 141 | bool "XT2000" |
142 | select XTENSA_CALIBRATE_CCOUNT | ||
143 | select PCI | ||
121 | help | 144 | help |
122 | XT2000 is the name of Tensilica's feature-rich emulation platform. | 145 | XT2000 is the name of Tensilica's feature-rich emulation platform. |
123 | This hardware is capable of running a full Linux distribution. | 146 | This hardware is capable of running a full Linux distribution. |
@@ -125,21 +148,14 @@ config XTENSA_PLATFORM_XT2000 | |||
125 | endchoice | 148 | endchoice |
126 | 149 | ||
127 | 150 | ||
128 | config XTENSA_CALIBRATE_CCOUNT | ||
129 | bool "Auto calibration of the CPU clock rate" | ||
130 | ---help--- | ||
131 | On some platforms (XT2000, for example), the CPU clock rate can | ||
132 | vary. The frequency can be determined, however, by measuring | ||
133 | against a well known, fixed frequency, such as an UART oscillator. | ||
134 | |||
135 | config XTENSA_CPU_CLOCK | 151 | config XTENSA_CPU_CLOCK |
136 | int "CPU clock rate [MHz]" | 152 | int "CPU clock rate [MHz]" |
137 | depends on !XTENSA_CALIBRATE_CCOUNT | 153 | depends on !XTENSA_CALIBRATE_CCOUNT |
138 | default "16" | 154 | default 16 |
139 | 155 | ||
140 | config GENERIC_CALIBRATE_DELAY | 156 | config GENERIC_CALIBRATE_DELAY |
141 | bool "Auto calibration of the BogoMIPS value" | 157 | bool "Auto calibration of the BogoMIPS value" |
142 | ---help--- | 158 | help |
143 | The BogoMIPS value can easily be derived from the CPU frequency. | 159 | The BogoMIPS value can easily be derived from the CPU frequency. |
144 | 160 | ||
145 | config CMDLINE_BOOL | 161 | config CMDLINE_BOOL |
@@ -156,52 +172,27 @@ config CMDLINE | |||
156 | time by entering them here. As a minimum, you should specify the | 172 | time by entering them here. As a minimum, you should specify the |
157 | memory size and the root device (e.g., mem=64M root=/dev/nfs). | 173 | memory size and the root device (e.g., mem=64M root=/dev/nfs). |
158 | 174 | ||
159 | config SERIAL_CONSOLE | ||
160 | bool | ||
161 | depends on XTENSA_PLATFORM_ISS | ||
162 | default y | ||
163 | |||
164 | config XTENSA_ISS_NETWORK | ||
165 | bool | ||
166 | depends on XTENSA_PLATFORM_ISS | ||
167 | default y | ||
168 | |||
169 | source "mm/Kconfig" | 175 | source "mm/Kconfig" |
170 | 176 | ||
171 | endmenu | 177 | endmenu |
172 | 178 | ||
173 | menu "Bus options" | 179 | config HOTPLUG |
174 | 180 | bool "Support for hot-pluggable devices" | |
175 | config PCI | ||
176 | bool "PCI support" if !XTENSA_PLATFORM_ISS | ||
177 | depends on !XTENSA_PLATFORM_ISS | ||
178 | default y | ||
179 | help | 181 | help |
180 | Find out whether you have a PCI motherboard. PCI is the name of a | 182 | Say Y here if you want to plug devices into your computer while |
181 | bus system, i.e. the way the CPU talks to the other stuff inside | 183 | the system is running, and be able to use them quickly. In many |
182 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or | 184 | cases, the devices can likewise be unplugged at any time too. |
183 | VESA. If you have PCI, say Y, otherwise N. | ||
184 | |||
185 | source "drivers/pci/Kconfig" | ||
186 | 185 | ||
187 | config HOTPLUG | 186 | One well known example of this is PCMCIA- or PC-cards, credit-card |
187 | size devices such as network cards, modems or hard drives which are | ||
188 | plugged into slots found on all modern laptop computers. Another | ||
189 | example, used on modern desktops as well as laptops, is USB. | ||
188 | 190 | ||
189 | bool "Support for hot-pluggable devices" | 191 | Enable HOTPLUG and build a modular kernel. Get agent software |
190 | ---help--- | 192 | (from <http://linux-hotplug.sourceforge.net/>) and install it. |
191 | Say Y here if you want to plug devices into your computer while | 193 | Then your kernel will automatically call out to a user mode "policy |
192 | the system is running, and be able to use them quickly. In many | 194 | agent" (/sbin/hotplug) to load modules and set up software needed |
193 | cases, the devices can likewise be unplugged at any time too. | 195 | to use devices as you hotplug them. |
194 | |||
195 | One well known example of this is PCMCIA- or PC-cards, credit-card | ||
196 | size devices such as network cards, modems or hard drives which are | ||
197 | plugged into slots found on all modern laptop computers. Another | ||
198 | example, used on modern desktops as well as laptops, is USB. | ||
199 | |||
200 | Enable HOTPLUG and build a modular kernel. Get agent software | ||
201 | (from <http://linux-hotplug.sourceforge.net/>) and install it. | ||
202 | Then your kernel will automatically call out to a user mode "policy | ||
203 | agent" (/sbin/hotplug) to load modules and set up software needed | ||
204 | to use devices as you hotplug them. | ||
205 | 196 | ||
206 | source "drivers/pcmcia/Kconfig" | 197 | source "drivers/pcmcia/Kconfig" |
207 | 198 | ||
@@ -213,9 +204,8 @@ menu "Executable file formats" | |||
213 | 204 | ||
214 | # only elf supported | 205 | # only elf supported |
215 | config KCORE_ELF | 206 | config KCORE_ELF |
216 | bool | 207 | def_bool y |
217 | depends on PROC_FS | 208 | depends on PROC_FS |
218 | default y | ||
219 | help | 209 | help |
220 | If you enabled support for /proc file system then the file | 210 | If you enabled support for /proc file system then the file |
221 | /proc/kcore will contain the kernel core image in ELF format. This | 211 | /proc/kcore will contain the kernel core image in ELF format. This |
@@ -240,7 +230,7 @@ source "fs/Kconfig" | |||
240 | menu "Xtensa initrd options" | 230 | menu "Xtensa initrd options" |
241 | depends on BLK_DEV_INITRD | 231 | depends on BLK_DEV_INITRD |
242 | 232 | ||
243 | config EMBEDDED_RAMDISK | 233 | config EMBEDDED_RAMDISK |
244 | bool "Embed root filesystem ramdisk into the kernel" | 234 | bool "Embed root filesystem ramdisk into the kernel" |
245 | 235 | ||
246 | config EMBEDDED_RAMDISK_IMAGE | 236 | config EMBEDDED_RAMDISK_IMAGE |