1menu "Kernel hacking" 2 3source "lib/Kconfig.debug" 4 5config DEBUG_STACKOVERFLOW 6 bool "Check for stack overflows" 7 depends on DEBUG_KERNEL 8 help 9 This option will cause messages to be printed if free stack space 10 drops below a certain limit. 11 12config DEBUG_STACK_USAGE 13 bool "Stack utilization instrumentation" 14 depends on DEBUG_KERNEL 15 help 16 Enables the display of the minimum amount of free stack which each 17 task has ever had available in the sysrq-T and sysrq-P debug output. 18 19 This option will slow down process creation somewhat. 20 21config DEBUG_PAGEALLOC 22 bool "Debug page memory allocations" 23 depends on DEBUG_KERNEL && !HIBERNATION 24 help 25 Unmap pages from the kernel linear mapping after free_pages(). 26 This results in a large slowdown, but helps to find certain types 27 of memory corruptions. 28 29 30config HCALL_STATS 31 bool "Hypervisor call instrumentation" 32 depends on PPC_PSERIES && DEBUG_FS 33 help 34 Adds code to keep track of the number of hypervisor calls made and 35 the amount of time spent in hypervisor calls. Wall time spent in 36 each call is always calculated, and if available CPU cycles spent 37 are also calculated. A directory named hcall_inst is added at the 38 root of the debugfs filesystem. Within the hcall_inst directory 39 are files that contain CPU specific call statistics. 40 41 This option will add a small amount of overhead to all hypervisor 42 calls. 43 44config DEBUGGER 45 bool "Enable debugger hooks" 46 depends on DEBUG_KERNEL 47 help 48 Include in-kernel hooks for kernel debuggers. Unless you are 49 intending to debug the kernel, say N here. 50 51config KGDB 52 bool "Include kgdb kernel debugger" 53 depends on DEBUGGER && (BROKEN || PPC_GEN550 || 4xx) 54 select DEBUG_INFO 55 help 56 Include in-kernel hooks for kgdb, the Linux kernel source level 57 debugger. See <http://kgdb.sourceforge.net/> for more information. 58 Unless you are intending to debug the kernel, say N here. 59 60choice 61 prompt "Serial Port" 62 depends on KGDB 63 default KGDB_TTYS1 64 65config KGDB_TTYS0 66 bool "ttyS0" 67 68config KGDB_TTYS1 69 bool "ttyS1" 70 71config KGDB_TTYS2 72 bool "ttyS2" 73 74config KGDB_TTYS3 75 bool "ttyS3" 76 77endchoice 78 79config KGDB_CONSOLE 80 bool "Enable serial console thru kgdb port" 81 depends on KGDB && 8xx || CPM2 82 help 83 If you enable this, all serial console messages will be sent 84 over the gdb stub. 85 If unsure, say N. 86 87config XMON 88 bool "Include xmon kernel debugger" 89 depends on DEBUGGER 90 help 91 Include in-kernel hooks for the xmon kernel monitor/debugger. 92 Unless you are intending to debug the kernel, say N here. 93 Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise 94 nothing will appear on the screen (xmon writes directly to the 95 framebuffer memory). 96 The cmdline option 'xmon' or 'xmon=early' will drop into xmon 97 very early during boot. 'xmon=on' will just enable the xmon 98 debugger hooks. 'xmon=off' will disable the debugger hooks 99 if CONFIG_XMON_DEFAULT is set. 100 xmon will print a backtrace on the very first invocation. 101 'xmon=nobt' will disable this autobacktrace. 102 103config XMON_DEFAULT 104 bool "Enable xmon by default" 105 depends on XMON 106 help 107 xmon is normally disabled unless booted with 'xmon=on'. 108 Use 'xmon=off' to disable xmon init during runtime. 109 110config XMON_DISASSEMBLY 111 bool "Include disassembly support in xmon" 112 depends on XMON 113 default y 114 help 115 Include support for disassembling in xmon. You probably want 116 to say Y here, unless you're building for a memory-constrained 117 system. 118 119config IRQSTACKS 120 bool "Use separate kernel stacks when processing interrupts" 121 depends on PPC64 122 help 123 If you say Y here the kernel will use separate kernel stacks 124 for handling hard and soft interrupts. This can help avoid 125 overflowing the process kernel stacks. 126 127config VIRQ_DEBUG 128 bool "Expose hardware/virtual IRQ mapping via debugfs" 129 depends on DEBUG_FS && PPC_MERGE 130 help 131 This option will show the mapping relationship between hardware irq 132 numbers and virtual irq numbers. The mapping is exposed via debugfs 133 in the file powerpc/virq_mapping. 134 135 If you don't know what this means you don't need it. 136 137config BDI_SWITCH 138 bool "Include BDI-2000 user context switcher" 139 depends on DEBUG_KERNEL && PPC32 140 help 141 Include in-kernel support for the Abatron BDI2000 debugger. 142 Unless you are intending to debug the kernel with one of these 143 machines, say N here. 144 145config BOOTX_TEXT 146 bool "Support for early boot text console (BootX or OpenFirmware only)" 147 depends on PPC_OF && PPC_MULTIPLATFORM 148 help 149 Say Y here to see progress messages from the boot firmware in text 150 mode. Requires either BootX or Open Firmware. 151 152config PPC_EARLY_DEBUG 153 bool "Early debugging (dangerous)" 154 help 155 Say Y to enable some early debugging facilities that may be available 156 for your processor/board combination. Those facilities are hacks 157 intended to debug problems early during boot, this should not be 158 enabled in a production kernel. 159 Note that enabling this will also cause the kernel default log level 160 to be pushed to max automatically very early during boot 161 162choice 163 prompt "Early debugging console" 164 depends on PPC_EARLY_DEBUG 165 help 166 Use the selected console for early debugging. Careful, if you 167 enable debugging for the wrong type of machine your kernel 168 _will not boot_. 169 170config PPC_EARLY_DEBUG_LPAR 171 bool "LPAR HV Console" 172 depends on PPC_PSERIES 173 help 174 Select this to enable early debugging for a machine with a HVC 175 console on vterm 0. 176 177config PPC_EARLY_DEBUG_G5 178 bool "Apple G5" 179 depends on PPC_PMAC64 180 help 181 Select this to enable early debugging for Apple G5 machines. 182 183config PPC_EARLY_DEBUG_RTAS_PANEL 184 bool "RTAS Panel" 185 depends on PPC_RTAS 186 help 187 Select this to enable early debugging via the RTAS panel. 188 189config PPC_EARLY_DEBUG_RTAS_CONSOLE 190 bool "RTAS Console" 191 depends on PPC_RTAS 192 select UDBG_RTAS_CONSOLE 193 help 194 Select this to enable early debugging via the RTAS console. 195 196config PPC_EARLY_DEBUG_MAPLE 197 bool "Maple real mode" 198 depends on PPC_MAPLE 199 help 200 Select this to enable early debugging for Maple. 201 202config PPC_EARLY_DEBUG_ISERIES 203 bool "iSeries HV Console" 204 depends on PPC_ISERIES 205 help 206 Select this to enable early debugging for legacy iSeries. You need 207 to hit "Ctrl-x Ctrl-x" to see the messages on the console. 208 209config PPC_EARLY_DEBUG_PAS_REALMODE 210 bool "PA Semi real mode" 211 depends on PPC_PASEMI 212 help 213 Select this to enable early debugging for PA Semi. 214 Output will be on UART0. 215 216config PPC_EARLY_DEBUG_BEAT 217 bool "Beat HV Console" 218 depends on PPC_CELLEB 219 select PPC_UDBG_BEAT 220 help 221 Select this to enable early debugging for Celleb with Beat. 222 223config PPC_EARLY_DEBUG_44x 224 bool "Early serial debugging for IBM/AMCC 44x CPUs" 225 depends on 44x 226 help 227 Select this to enable early debugging for IBM 44x chips via the 228 inbuilt serial port. If you enable this, ensure you set 229 PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board. 230 231config PPC_EARLY_DEBUG_40x 232 bool "Early serial debugging for IBM/AMCC 40x CPUs" 233 depends on 40x 234 help 235 Select this to enable early debugging for IBM 40x chips via the 236 inbuilt serial port. This works on chips with a 16550 compatible 237 UART. Xilinx chips with uartlite cannot use this option. 238 239config PPC_EARLY_DEBUG_CPM 240 bool "Early serial debugging for Freescale CPM-based serial ports" 241 depends on SERIAL_CPM 242 select PIN_TLB if PPC_8xx 243 help 244 Select this to enable early debugging for Freescale chips 245 using a CPM-based serial port. This assumes that the bootwrapper 246 has run, and set up the CPM in a particular way. 247 248endchoice 249 250config PPC_EARLY_DEBUG_44x_PHYSLOW 251 hex "Low 32 bits of early debug UART physical address" 252 depends on PPC_EARLY_DEBUG_44x 253 default "0x40000200" 254 help 255 You probably want 0x40000200 for ebony boards and 256 0x40000300 for taishan 257 258config PPC_EARLY_DEBUG_44x_PHYSHIGH 259 hex "EPRN of early debug UART physical address" 260 depends on PPC_EARLY_DEBUG_44x 261 default "0x1" 262 263config PPC_EARLY_DEBUG_40x_PHYSADDR 264 hex "Early debug UART physical address" 265 depends on PPC_EARLY_DEBUG_40x 266 default "0xef600300" 267 268config PPC_EARLY_DEBUG_CPM_ADDR 269 hex "CPM UART early debug transmit descriptor address" 270 depends on PPC_EARLY_DEBUG_CPM 271 default "0xfa202008" if PPC_EP88XC 272 default "0xf0000008" if CPM2 273 default "0xff002008" if CPM1 274 help 275 This specifies the address of the transmit descriptor 276 used for early debug output. Because it is needed before 277 platform probing is done, all platforms selected must 278 share the same address. 279 280endmenu 281