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