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 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
  51 config 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
  60 config CODE_PATCHING_SELFTEST
  61         bool "Run self-tests of the code-patching code."
  62         depends on DEBUG_KERNEL
  63         default n
  64
  65 config FTR_FIXUP_SELFTEST
  66         bool "Run self-tests of the feature-fixup code."
  67         depends on DEBUG_KERNEL
  68         default n
  69
  70 choice
  71         prompt "Serial Port"
  72         depends on KGDB
  73         default KGDB_TTYS1
  74
  75 config KGDB_TTYS0
  76         bool "ttyS0"
  77
  78 config KGDB_TTYS1
  79         bool "ttyS1"
  80
  81 config KGDB_TTYS2
  82         bool "ttyS2"
  83
  84 config KGDB_TTYS3
  85         bool "ttyS3"
  86
  87 endchoice
  88
  89 config KGDB_CONSOLE
  90         bool "Enable serial console thru kgdb port"
  91         depends on KGDB && 8xx || CPM2
  92         help
  93           If you enable this, all serial console messages will be sent
  94           over the gdb stub.
  95           If unsure, say N.
  96
  97 config XMON
  98         bool "Include xmon kernel debugger"
  99         depends on DEBUGGER
 100         help
 101           Include in-kernel hooks for the xmon kernel monitor/debugger.
 102           Unless you are intending to debug the kernel, say N here.
 103           Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
 104           nothing will appear on the screen (xmon writes directly to the
 105           framebuffer memory).
 106           The cmdline option 'xmon' or 'xmon=early' will drop into xmon
 107           very early during boot. 'xmon=on' will just enable the xmon
 108           debugger hooks.  'xmon=off' will disable the debugger hooks
 109           if CONFIG_XMON_DEFAULT is set.
 110           xmon will print a backtrace on the very first invocation.
 111           'xmon=nobt' will disable this autobacktrace.
 112
 113 config XMON_DEFAULT
 114         bool "Enable xmon by default"
 115         depends on XMON
 116         help
 117           xmon is normally disabled unless booted with 'xmon=on'.
 118           Use 'xmon=off' to disable xmon init during runtime.
 119
 120 config XMON_DISASSEMBLY
 121         bool "Include disassembly support in xmon"
 122         depends on XMON
 123         default y
 124         help
 125           Include support for disassembling in xmon. You probably want
 126           to say Y here, unless you're building for a memory-constrained
 127           system.
 128
 129 config IRQSTACKS
 130         bool "Use separate kernel stacks when processing interrupts"
 131         help
 132           If you say Y here the kernel will use separate kernel stacks
 133           for handling hard and soft interrupts.  This can help avoid
 134           overflowing the process kernel stacks.
 135
 136 config VIRQ_DEBUG
 137         bool "Expose hardware/virtual IRQ mapping via debugfs"
 138         depends on DEBUG_FS && PPC_MERGE
 139         help
 140           This option will show the mapping relationship between hardware irq
 141           numbers and virtual irq numbers. The mapping is exposed via debugfs
 142           in the file powerpc/virq_mapping.
 143
 144           If you don't know what this means you don't need it.
 145
 146 config BDI_SWITCH
 147         bool "Include BDI-2000 user context switcher"
 148         depends on DEBUG_KERNEL && PPC32
 149         help
 150           Include in-kernel support for the Abatron BDI2000 debugger.
 151           Unless you are intending to debug the kernel with one of these
 152           machines, say N here.
 153
 154 config BOOTX_TEXT
 155         bool "Support for early boot text console (BootX or OpenFirmware only)"
 156         depends on PPC_OF && PPC_MULTIPLATFORM
 157         help
 158           Say Y here to see progress messages from the boot firmware in text
 159           mode. Requires either BootX or Open Firmware.
 160
 161 config PPC_EARLY_DEBUG
 162         bool "Early debugging (dangerous)"
 163         # PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
 164         # mark, which doesn't work with current 440 KVM.
 165         depends on !KVM
 166         help
 167           Say Y to enable some early debugging facilities that may be available
 168           for your processor/board combination. Those facilities are hacks
 169           intended to debug problems early during boot, this should not be
 170           enabled in a production kernel.
 171           Note that enabling this will also cause the kernel default log level
 172           to be pushed to max automatically very early during boot
 173
 174 choice
 175         prompt "Early debugging console"
 176         depends on PPC_EARLY_DEBUG
 177         help
 178           Use the selected console for early debugging. Careful, if you
 179           enable debugging for the wrong type of machine your kernel
 180           _will not boot_.
 181
 182 config PPC_EARLY_DEBUG_LPAR
 183         bool "LPAR HV Console"
 184         depends on PPC_PSERIES
 185         help
 186           Select this to enable early debugging for a machine with a HVC
 187           console on vterm 0.
 188
 189 config PPC_EARLY_DEBUG_G5
 190         bool "Apple G5"
 191         depends on PPC_PMAC64
 192         help
 193           Select this to enable early debugging for Apple G5 machines.
 194
 195 config PPC_EARLY_DEBUG_RTAS_PANEL
 196         bool "RTAS Panel"
 197         depends on PPC_RTAS
 198         help
 199           Select this to enable early debugging via the RTAS panel.
 200
 201 config PPC_EARLY_DEBUG_RTAS_CONSOLE
 202         bool "RTAS Console"
 203         depends on PPC_RTAS
 204         select UDBG_RTAS_CONSOLE
 205         help
 206           Select this to enable early debugging via the RTAS console.
 207
 208 config PPC_EARLY_DEBUG_MAPLE
 209         bool "Maple real mode"
 210         depends on PPC_MAPLE
 211         help
 212           Select this to enable early debugging for Maple.
 213
 214 config PPC_EARLY_DEBUG_ISERIES
 215         bool "iSeries HV Console"
 216         depends on PPC_ISERIES
 217         help
 218           Select this to enable early debugging for legacy iSeries. You need
 219           to hit "Ctrl-x Ctrl-x" to see the messages on the console.
 220
 221 config PPC_EARLY_DEBUG_PAS_REALMODE
 222         bool "PA Semi real mode"
 223         depends on PPC_PASEMI
 224         help
 225           Select this to enable early debugging for PA Semi.
 226           Output will be on UART0.
 227
 228 config PPC_EARLY_DEBUG_BEAT
 229         bool "Beat HV Console"
 230         depends on PPC_CELLEB
 231         select PPC_UDBG_BEAT
 232         help
 233           Select this to enable early debugging for Celleb with Beat.
 234
 235 config PPC_EARLY_DEBUG_44x
 236         bool "Early serial debugging for IBM/AMCC 44x CPUs"
 237         depends on 44x
 238         help
 239           Select this to enable early debugging for IBM 44x chips via the
 240           inbuilt serial port.  If you enable this, ensure you set
 241           PPC_EARLY_DEBUG_44x_PHYSLOW below to suit your target board.
 242
 243 config PPC_EARLY_DEBUG_40x
 244         bool "Early serial debugging for IBM/AMCC 40x CPUs"
 245         depends on 40x
 246         help
 247           Select this to enable early debugging for IBM 40x chips via the
 248           inbuilt serial port. This works on chips with a 16550 compatible
 249           UART. Xilinx chips with uartlite cannot use this option.
 250
 251 config PPC_EARLY_DEBUG_CPM
 252         bool "Early serial debugging for Freescale CPM-based serial ports"
 253         depends on SERIAL_CPM
 254         select PIN_TLB if PPC_8xx
 255         help
 256           Select this to enable early debugging for Freescale chips
 257           using a CPM-based serial port.  This assumes that the bootwrapper
 258           has run, and set up the CPM in a particular way.
 259
 260 endchoice
 261
 262 config PPC_EARLY_DEBUG_44x_PHYSLOW
 263         hex "Low 32 bits of early debug UART physical address"
 264         depends on PPC_EARLY_DEBUG_44x
 265         default "0x40000200"
 266         help
 267           You probably want 0x40000200 for ebony boards and
 268           0x40000300 for taishan
 269
 270 config PPC_EARLY_DEBUG_44x_PHYSHIGH
 271         hex "EPRN of early debug UART physical address"
 272         depends on PPC_EARLY_DEBUG_44x
 273         default "0x1"
 274
 275 config PPC_EARLY_DEBUG_40x_PHYSADDR
 276         hex "Early debug UART physical address"
 277         depends on PPC_EARLY_DEBUG_40x
 278         default "0xef600300"
 279
 280 config PPC_EARLY_DEBUG_CPM_ADDR
 281         hex "CPM UART early debug transmit descriptor address"
 282         depends on PPC_EARLY_DEBUG_CPM
 283         default "0xfa202008" if PPC_EP88XC
 284         default "0xf0001ff8" if CPM2
 285         default "0xff002008" if CPM1
 286         help
 287           This specifies the address of the transmit descriptor
 288           used for early debug output.  Because it is needed before
 289           platform probing is done, all platforms selected must
 290           share the same address.
 291
 292 endmenu