arch/powerpc/Kconfig.debug

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