arch/powerpc/Kconfig.debug

   1 menu "Kernel hacking"
   2
   3 source "lib/Kconfig.debug"
   4
   5 config PPC_DISABLE_WERROR
   6         bool "Don't build arch/powerpc code with -Werror"
   7         default n
   8         help
   9           This option tells the compiler NOT to build the code under
  10           arch/powerpc with the -Werror flag (which means warnings
  11           are treated as errors).
  12
  13           Only enable this if you are hitting a build failure in the
  14           arch/powerpc code caused by a warning, and you don't feel
  15           inclined to fix it.
  16
  17 config PPC_WERROR
  18         bool
  19         depends on !PPC_DISABLE_WERROR
  20         default y
  21
  22 config PRINT_STACK_DEPTH
  23         int "Stack depth to print" if DEBUG_KERNEL
  24         default 64
  25         help
  26           This option allows you to set the stack depth that the kernel
  27           prints in stack traces. This can be useful if your display is
  28           too small and stack traces cause important information to
  29           scroll off the screen.
  30
  31 config DEBUG_STACKOVERFLOW
  32         bool "Check for stack overflows"
  33         depends on DEBUG_KERNEL
  34         help
  35           This option will cause messages to be printed if free stack space
  36           drops below a certain limit.
  37
  38 config DEBUG_STACK_USAGE
  39         bool "Stack utilization instrumentation"
  40         depends on DEBUG_KERNEL
  41         help
  42           Enables the display of the minimum amount of free stack which each
  43           task has ever had available in the sysrq-T and sysrq-P debug output.
  44
  45           This option will slow down process creation somewhat.
  46
  47 config DEBUG_PER_CPU_MAPS
  48         bool "Debug access to per_cpu maps"
  49         depends on DEBUG_KERNEL
  50         depends on SMP
  51         default n
  52         ---help---
  53           Say Y to verify that the per_cpu map being accessed has
  54           been setup.  Adds a fair amount of code to kernel memory
  55           and decreases performance.
  56
  57           Say N if unsure.
  58
  59 config HCALL_STATS
  60         bool "Hypervisor call instrumentation"
  61         depends on PPC_PSERIES && DEBUG_FS && TRACEPOINTS
  62         help
  63           Adds code to keep track of the number of hypervisor calls made and
  64           the amount of time spent in hypervisor calls.  Wall time spent in
  65           each call is always calculated, and if available CPU cycles spent
  66           are also calculated.  A directory named hcall_inst is added at the
  67           root of the debugfs filesystem.  Within the hcall_inst directory
  68           are files that contain CPU specific call statistics.
  69
  70           This option will add a small amount of overhead to all hypervisor
  71           calls.
  72
  73 config PPC_EMULATED_STATS
  74         bool "Emulated instructions tracking"
  75         depends on DEBUG_FS
  76         help
  77           Adds code to keep track of the number of instructions that are
  78           emulated by the in-kernel emulator. Counters for the various classes
  79           of emulated instructions are available under
  80           powerpc/emulated_instructions/ in the root of the debugfs file
  81           system. Optionally (controlled by
  82           powerpc/emulated_instructions/do_warn in debugfs), rate-limited
  83           warnings can be printed to the console when instructions are
  84           emulated.
  85
  86 config CODE_PATCHING_SELFTEST
  87         bool "Run self-tests of the code-patching code."
  88         depends on DEBUG_KERNEL
  89         default n
  90
  91 config FTR_FIXUP_SELFTEST
  92         bool "Run self-tests of the feature-fixup code."
  93         depends on DEBUG_KERNEL
  94         default n
  95
  96 config MSI_BITMAP_SELFTEST
  97         bool "Run self-tests of the MSI bitmap code."
  98         depends on DEBUG_KERNEL
  99         default n
 100
 101 config XMON
 102         bool "Include xmon kernel debugger"
 103         depends on DEBUG_KERNEL
 104         help
 105           Include in-kernel hooks for the xmon kernel monitor/debugger.
 106           Unless you are intending to debug the kernel, say N here.
 107           Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
 108           nothing will appear on the screen (xmon writes directly to the
 109           framebuffer memory).
 110           The cmdline option 'xmon' or 'xmon=early' will drop into xmon
 111           very early during boot. 'xmon=on' will just enable the xmon
 112           debugger hooks.  'xmon=off' will disable the debugger hooks
 113           if CONFIG_XMON_DEFAULT is set.
 114           xmon will print a backtrace on the very first invocation.
 115           'xmon=nobt' will disable this autobacktrace.
 116
 117 config XMON_DEFAULT
 118         bool "Enable xmon by default"
 119         depends on XMON
 120         help
 121           xmon is normally disabled unless booted with 'xmon=on'.
 122           Use 'xmon=off' to disable xmon init during runtime.
 123
 124 config XMON_DISASSEMBLY
 125         bool "Include disassembly support in xmon"
 126         depends on XMON
 127         default y
 128         help
 129           Include support for disassembling in xmon. You probably want
 130           to say Y here, unless you're building for a memory-constrained
 131           system.
 132
 133 config DEBUGGER
 134         bool
 135         depends on KGDB || XMON
 136         default y
 137
 138 config IRQSTACKS
 139         bool "Use separate kernel stacks when processing interrupts"
 140         help
 141           If you say Y here the kernel will use separate kernel stacks
 142           for handling hard and soft interrupts.  This can help avoid
 143           overflowing the process kernel stacks.
 144
 145 config VIRQ_DEBUG
 146         bool "Expose hardware/virtual IRQ mapping via debugfs"
 147         depends on DEBUG_FS
 148         help
 149           This option will show the mapping relationship between hardware irq
 150           numbers and virtual irq numbers. The mapping is exposed via debugfs
 151           in the file powerpc/virq_mapping.
 152
 153           If you don't know what this means you don't need it.
 154
 155 config BDI_SWITCH
 156         bool "Include BDI-2000 user context switcher"
 157         depends on DEBUG_KERNEL && PPC32
 158         help
 159           Include in-kernel support for the Abatron BDI2000 debugger.
 160           Unless you are intending to debug the kernel with one of these
 161           machines, say N here.
 162
 163 config BOOTX_TEXT
 164         bool "Support for early boot text console (BootX or OpenFirmware only)"
 165         depends on PPC_OF && PPC_BOOK3S
 166         help
 167           Say Y here to see progress messages from the boot firmware in text
 168           mode. Requires either BootX or Open Firmware.
 169
 170 config PPC_EARLY_DEBUG
 171         bool "Early debugging (dangerous)"
 172         # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
 173         # mark, which doesn't work with current 440 KVM.
 174         depends on !KVM
 175         help
 176           Say Y to enable some early debugging facilities that may be available
 177           for your processor/board combination. Those facilities are hacks
 178           intended to debug problems early during boot, this should not be
 179           enabled in a production kernel.
 180           Note that enabling this will also cause the kernel default log level
 181           to be pushed to max automatically very early during boot
 182
 183 choice
 184         prompt "Early debugging console"
 185         depends on PPC_EARLY_DEBUG
 186         help
 187           Use the selected console for early debugging. Careful, if you
 188           enable debugging for the wrong type of machine your kernel
 189           _will not boot_.
 190
 191 config PPC_EARLY_DEBUG_LPAR
 192         bool "LPAR HV Console"
 193         depends on PPC_PSERIES
 194         help
 195           Select this to enable early debugging for a machine with a HVC
 196           console on vterm 0.
 197
 198 config PPC_EARLY_DEBUG_G5
 199         bool "Apple G5"
 200         depends on PPC_PMAC64
 201         help
 202           Select this to enable early debugging for Apple G5 machines.
 203
 204 config PPC_EARLY_DEBUG_RTAS_PANEL
 205         bool "RTAS Panel"
 206         depends on PPC_RTAS
 207         help
 208           Select this to enable early debugging via the RTAS panel.
 209
 210 config PPC_EARLY_DEBUG_RTAS_CONSOLE
 211         bool "RTAS Console"
 212         depends on PPC_RTAS
 213         select UDBG_RTAS_CONSOLE
 214         help
 215           Select this to enable early debugging via the RTAS console.
 216
 217 config PPC_EARLY_DEBUG_MAPLE
 218         bool "Maple real mode"
 219         depends on PPC_MAPLE
 220         help
 221           Select this to enable early debugging for Maple.
 222
 223 config PPC_EARLY_DEBUG_ISERIES
 224         bool "iSeries HV Console"
 225         depends on PPC_ISERIES
 226         help
 227           Select this to enable early debugging for legacy iSeries. You need
 228           to hit "Ctrl-x Ctrl-x" to see the messages on the console.
 229
 230 config PPC_EARLY_DEBUG_PAS_REALMODE
 231         bool "PA Semi real mode"
 232         depends on PPC_PASEMI
 233         help
 234           Select this to enable early debugging for PA Semi.
 235           Output will be on UART0.
 236
 237 config PPC_EARLY_DEBUG_BEAT
 238         bool "Beat HV Console"
 239         depends on PPC_CELLEB
 240         select PPC_UDBG_BEAT
 241         help
 242           Select this to enable early debugging for Celleb with Beat.
 243
 244 config PPC_EARLY_DEBUG_44x
 245         bool "Early serial debugging for IBM/AMCC 44x CPUs"
 246         depends on 44x
 247         help
 248           Select this to enable early debugging for IBM 44x chips via the
 249           inbuilt serial port.  If you enable this, ensure you set
 250           PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
 251
 252 config PPC_EARLY_DEBUG_40x
 253         bool "Early serial debugging for IBM/AMCC 40x CPUs"
 254         depends on 40x
 255         help
 256           Select this to enable early debugging for IBM 40x chips via the
 257           inbuilt serial port. This works on chips with a 16550 compatible
 258           UART. Xilinx chips with uartlite cannot use this option.
 259
 260 config PPC_EARLY_DEBUG_CPM
 261         bool "Early serial debugging for Freescale CPM-based serial ports"
 262         depends on SERIAL_CPM
 263         select PIN_TLB if PPC_8xx
 264         help
 265           Select this to enable early debugging for Freescale chips
 266           using a CPM-based serial port.  This assumes that the bootwrapper
 267           has run, and set up the CPM in a particular way.
 268
 269 config PPC_EARLY_DEBUG_USBGECKO
 270         bool "Early debugging through the USB Gecko adapter"
 271         depends on GAMECUBE_COMMON
 272         select USBGECKO_UDBG
 273         help
 274           Select this to enable early debugging for Nintendo GameCube/Wii
 275           consoles via an external USB Gecko adapter.
 276
 277 endchoice
 278
 279 config PPC_EARLY_DEBUG_44x_PHYSLOW
 280         hex "Low 32 bits of early debug UART physical address"
 281         depends on PPC_EARLY_DEBUG_44x
 282         default "0x40000200"
 283         help
 284           You probably want 0x40000200 for ebony boards and
 285           0x40000300 for taishan
 286
 287 config PPC_EARLY_DEBUG_44x_PHYSHIGH
 288         hex "EPRN of early debug UART physical address"
 289         depends on PPC_EARLY_DEBUG_44x
 290         default "0x1"
 291
 292 config PPC_EARLY_DEBUG_40x_PHYSADDR
 293         hex "Early debug UART physical address"
 294         depends on PPC_EARLY_DEBUG_40x
 295         default "0xef600300"
 296
 297 config PPC_EARLY_DEBUG_CPM_ADDR
 298         hex "CPM UART early debug transmit descriptor address"
 299         depends on PPC_EARLY_DEBUG_CPM
 300         default "0xfa202008" if PPC_EP88XC
 301         default "0xf0001ff8" if CPM2
 302         default "0xff002008" if CPM1
 303         help
 304           This specifies the address of the transmit descriptor
 305           used for early debug output.  Because it is needed before
 306           platform probing is done, all platforms selected must
 307           share the same address.
 308
 309 endmenu