arch/powerpc/Kconfig.debug

   1 menu "Kernel hacking"
   2
   3 source "lib/Kconfig.debug"
   4
   5 config 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
  12 config 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
  21 config 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
  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 XMON
  55         bool "Include xmon kernel debugger"
  56         depends on DEBUG_KERNEL
  57         help
  58           Include in-kernel hooks for the xmon kernel monitor/debugger.
  59           Unless you are intending to debug the kernel, say N here.
  60           Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
  61           nothing will appear on the screen (xmon writes directly to the
  62           framebuffer memory).
  63           The cmdline option 'xmon' or 'xmon=early' will drop into xmon
  64           very early during boot. 'xmon=on' will just enable the xmon
  65           debugger hooks.  'xmon=off' will disable the debugger hooks
  66           if CONFIG_XMON_DEFAULT is set.
  67           xmon will print a backtrace on the very first invocation.
  68           'xmon=nobt' will disable this autobacktrace.
  69
  70 config XMON_DEFAULT
  71         bool "Enable xmon by default"
  72         depends on XMON
  73         help
  74           xmon is normally disabled unless booted with 'xmon=on'.
  75           Use 'xmon=off' to disable xmon init during runtime.
  76
  77 config XMON_DISASSEMBLY
  78         bool "Include disassembly support in xmon"
  79         depends on XMON
  80         default y
  81         help
  82           Include support for disassembling in xmon. You probably want
  83           to say Y here, unless you're building for a memory-constrained
  84           system.
  85
  86 config DEBUGGER
  87         bool
  88         depends on KGDB || XMON
  89         default y
  90
  91 config IRQSTACKS
  92         bool "Use separate kernel stacks when processing interrupts"
  93         help
  94           If you say Y here the kernel will use separate kernel stacks
  95           for handling hard and soft interrupts.  This can help avoid
  96           overflowing the process kernel stacks.
  97
  98 config VIRQ_DEBUG
  99         bool "Expose hardware/virtual IRQ mapping via debugfs"
 100         depends on DEBUG_FS
 101         help
 102           This option will show the mapping relationship between hardware irq
 103           numbers and virtual irq numbers. The mapping is exposed via debugfs
 104           in the file powerpc/virq_mapping.
 105
 106           If you don't know what this means you don't need it.
 107
 108 config BDI_SWITCH
 109         bool "Include BDI-2000 user context switcher"
 110         depends on DEBUG_KERNEL && PPC32
 111         help
 112           Include in-kernel support for the Abatron BDI2000 debugger.
 113           Unless you are intending to debug the kernel with one of these
 114           machines, say N here.
 115
 116 config BOOTX_TEXT
 117         bool "Support for early boot text console (BootX or OpenFirmware only)"
 118         depends on PPC_OF && PPC_MULTIPLATFORM
 119         help
 120           Say Y here to see progress messages from the boot firmware in text
 121           mode. Requires either BootX or Open Firmware.
 122
 123 config PPC_EARLY_DEBUG
 124         bool "Early debugging (dangerous)"
 125         # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
 126         # mark, which doesn't work with current 440 KVM.
 127         depends on !KVM
 128         help
 129           Say Y to enable some early debugging facilities that may be available
 130           for your processor/board combination. Those facilities are hacks
 131           intended to debug problems early during boot, this should not be
 132           enabled in a production kernel.
 133           Note that enabling this will also cause the kernel default log level
 134           to be pushed to max automatically very early during boot
 135
 136 choice
 137         prompt "Early debugging console"
 138         depends on PPC_EARLY_DEBUG
 139         help
 140           Use the selected console for early debugging. Careful, if you
 141           enable debugging for the wrong type of machine your kernel
 142           _will not boot_.
 143
 144 config PPC_EARLY_DEBUG_LPAR
 145         bool "LPAR HV Console"
 146         depends on PPC_PSERIES
 147         help
 148           Select this to enable early debugging for a machine with a HVC
 149           console on vterm 0.
 150
 151 config PPC_EARLY_DEBUG_G5
 152         bool "Apple G5"
 153         depends on PPC_PMAC64
 154         help
 155           Select this to enable early debugging for Apple G5 machines.
 156
 157 config PPC_EARLY_DEBUG_RTAS_PANEL
 158         bool "RTAS Panel"
 159         depends on PPC_RTAS
 160         help
 161           Select this to enable early debugging via the RTAS panel.
 162
 163 config PPC_EARLY_DEBUG_RTAS_CONSOLE
 164         bool "RTAS Console"
 165         depends on PPC_RTAS
 166         select UDBG_RTAS_CONSOLE
 167         help
 168           Select this to enable early debugging via the RTAS console.
 169
 170 config PPC_EARLY_DEBUG_MAPLE
 171         bool "Maple real mode"
 172         depends on PPC_MAPLE
 173         help
 174           Select this to enable early debugging for Maple.
 175
 176 config PPC_EARLY_DEBUG_ISERIES
 177         bool "iSeries HV Console"
 178         depends on PPC_ISERIES
 179         help
 180           Select this to enable early debugging for legacy iSeries. You need
 181           to hit "Ctrl-x Ctrl-x" to see the messages on the console.
 182
 183 config PPC_EARLY_DEBUG_PAS_REALMODE
 184         bool "PA Semi real mode"
 185         depends on PPC_PASEMI
 186         help
 187           Select this to enable early debugging for PA Semi.
 188           Output will be on UART0.
 189
 190 config PPC_EARLY_DEBUG_BEAT
 191         bool "Beat HV Console"
 192         depends on PPC_CELLEB
 193         select PPC_UDBG_BEAT
 194         help
 195           Select this to enable early debugging for Celleb with Beat.
 196
 197 config PPC_EARLY_DEBUG_44x
 198         bool "Early serial debugging for IBM/AMCC 44x CPUs"
 199         depends on 44x
 200         help
 201           Select this to enable early debugging for IBM 44x chips via the
 202           inbuilt serial port.  If you enable this, ensure you set
 203           PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
 204
 205 config PPC_EARLY_DEBUG_40x
 206         bool "Early serial debugging for IBM/AMCC 40x CPUs"
 207         depends on 40x
 208         help
 209           Select this to enable early debugging for IBM 40x chips via the
 210           inbuilt serial port. This works on chips with a 16550 compatible
 211           UART. Xilinx chips with uartlite cannot use this option.
 212
 213 config PPC_EARLY_DEBUG_CPM
 214         bool "Early serial debugging for Freescale CPM-based serial ports"
 215         depends on SERIAL_CPM
 216         select PIN_TLB if PPC_8xx
 217         help
 218           Select this to enable early debugging for Freescale chips
 219           using a CPM-based serial port.  This assumes that the bootwrapper
 220           has run, and set up the CPM in a particular way.
 221
 222 endchoice
 223
 224 config PPC_EARLY_DEBUG_44x_PHYSLOW
 225         hex "Low 32 bits of early debug UART physical address"
 226         depends on PPC_EARLY_DEBUG_44x
 227         default "0x40000200"
 228         help
 229           You probably want 0x40000200 for ebony boards and
 230           0x40000300 for taishan
 231
 232 config PPC_EARLY_DEBUG_44x_PHYSHIGH
 233         hex "EPRN of early debug UART physical address"
 234         depends on PPC_EARLY_DEBUG_44x
 235         default "0x1"
 236
 237 config PPC_EARLY_DEBUG_40x_PHYSADDR
 238         hex "Early debug UART physical address"
 239         depends on PPC_EARLY_DEBUG_40x
 240         default "0xef600300"
 241
 242 config PPC_EARLY_DEBUG_CPM_ADDR
 243         hex "CPM UART early debug transmit descriptor address"
 244         depends on PPC_EARLY_DEBUG_CPM
 245         default "0xfa202008" if PPC_EP88XC
 246         default "0xf0001ff8" if CPM2
 247         default "0xff002008" if CPM1
 248         help
 249           This specifies the address of the transmit descriptor
 250           used for early debug output.  Because it is needed before
 251           platform probing is done, all platforms selected must
 252           share the same address.
 253
 254 endmenu