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 choice
  61         prompt "Serial Port"
  62         depends on KGDB
  63         default KGDB_TTYS1
  64
  65 config KGDB_TTYS0
  66         bool "ttyS0"
  67
  68 config KGDB_TTYS1
  69         bool "ttyS1"
  70
  71 config KGDB_TTYS2
  72         bool "ttyS2"
  73
  74 config KGDB_TTYS3
  75         bool "ttyS3"
  76
  77 endchoice
  78
  79 config KGDB_CONSOLE
  80         bool "Enable serial console thru kgdb port"
  81         depends on KGDB && 8xx || CPM2
  82         help
  83           If you enable this, all serial console messages will be sent
  84           over the gdb stub.
  85           If unsure, say N.
  86
  87 config XMON
  88         bool "Include xmon kernel debugger"
  89         depends on DEBUGGER
  90         help
  91           Include in-kernel hooks for the xmon kernel monitor/debugger.
  92           Unless you are intending to debug the kernel, say N here.
  93           Make sure to enable also CONFIG_BOOTX_TEXT on Macs. Otherwise
  94           nothing will appear on the screen (xmon writes directly to the
  95           framebuffer memory).
  96           The cmdline option 'xmon' or 'xmon=early' will drop into xmon
  97           very early during boot. 'xmon=on' will just enable the xmon
  98           debugger hooks.  'xmon=off' will disable the debugger hooks
  99           if CONFIG_XMON_DEFAULT is set.
 100           xmon will print a backtrace on the very first invocation.
 101           'xmon=nobt' will disable this autobacktrace.
 102
 103 config XMON_DEFAULT
 104         bool "Enable xmon by default"
 105         depends on XMON
 106         help
 107           xmon is normally disabled unless booted with 'xmon=on'.
 108           Use 'xmon=off' to disable xmon init during runtime.
 109
 110 config XMON_DISASSEMBLY
 111         bool "Include disassembly support in xmon"
 112         depends on XMON
 113         default y
 114         help
 115           Include support for disassembling in xmon. You probably want
 116           to say Y here, unless you're building for a memory-constrained
 117           system.
 118
 119 config IRQSTACKS
 120         bool "Use separate kernel stacks when processing interrupts"
 121         depends on PPC64
 122         help
 123           If you say Y here the kernel will use separate kernel stacks
 124           for handling hard and soft interrupts.  This can help avoid
 125           overflowing the process kernel stacks.
 126
 127 config VIRQ_DEBUG
 128         bool "Expose hardware/virtual IRQ mapping via debugfs"
 129         depends on DEBUG_FS && PPC_MERGE
 130         help
 131           This option will show the mapping relationship between hardware irq
 132           numbers and virtual irq numbers. The mapping is exposed via debugfs
 133           in the file powerpc/virq_mapping.
 134
 135           If you don't know what this means you don't need it.
 136
 137 config BDI_SWITCH
 138         bool "Include BDI-2000 user context switcher"
 139         depends on DEBUG_KERNEL && PPC32
 140         help
 141           Include in-kernel support for the Abatron BDI2000 debugger.
 142           Unless you are intending to debug the kernel with one of these
 143           machines, say N here.
 144
 145 config BOOTX_TEXT
 146         bool "Support for early boot text console (BootX or OpenFirmware only)"
 147         depends PPC_OF && PPC_MULTIPLATFORM
 148         help
 149           Say Y here to see progress messages from the boot firmware in text
 150           mode. Requires either BootX or Open Firmware.
 151
 152 config PPC_EARLY_DEBUG
 153         bool "Early debugging (dangerous)"
 154
 155 choice
 156         prompt "Early debugging console"
 157         depends on PPC_EARLY_DEBUG
 158         help
 159           Use the selected console for early debugging. Careful, if you
 160           enable debugging for the wrong type of machine your kernel
 161           _will not boot_.
 162
 163 config PPC_EARLY_DEBUG_LPAR
 164         bool "LPAR HV Console"
 165         depends on PPC_PSERIES
 166         help
 167           Select this to enable early debugging for a machine with a HVC
 168           console on vterm 0.
 169
 170 config PPC_EARLY_DEBUG_G5
 171         bool "Apple G5"
 172         depends on PPC_PMAC64
 173         help
 174           Select this to enable early debugging for Apple G5 machines.
 175
 176 config PPC_EARLY_DEBUG_RTAS_PANEL
 177         bool "RTAS Panel"
 178         depends on PPC_RTAS
 179         help
 180           Select this to enable early debugging via the RTAS panel.
 181
 182 config PPC_EARLY_DEBUG_RTAS_CONSOLE
 183         bool "RTAS Console"
 184         depends on PPC_RTAS
 185         select UDBG_RTAS_CONSOLE
 186         help
 187           Select this to enable early debugging via the RTAS console.
 188
 189 config PPC_EARLY_DEBUG_MAPLE
 190         bool "Maple real mode"
 191         depends on PPC_MAPLE
 192         help
 193           Select this to enable early debugging for Maple.
 194
 195 config PPC_EARLY_DEBUG_ISERIES
 196         bool "iSeries HV Console"
 197         depends on PPC_ISERIES
 198         help
 199           Select this to enable early debugging for legacy iSeries. You need
 200           to hit "Ctrl-x Ctrl-x" to see the messages on the console.
 201
 202 config PPC_EARLY_DEBUG_PAS_REALMODE
 203         bool "PA Semi real mode"
 204         depends on PPC_PASEMI
 205         help
 206           Select this to enable early debugging for PA Semi.
 207           Output will be on UART0.
 208
 209 config PPC_EARLY_DEBUG_BEAT
 210         bool "Beat HV Console"
 211         depends on PPC_CELLEB
 212         select PPC_UDBG_BEAT
 213         help
 214           Select this to enable early debugging for Celleb with Beat.
 215
 216 config PPC_EARLY_DEBUG_44x
 217         bool "Early serial debugging for IBM/AMCC 44x CPUs"
 218         depends on 44x
 219         select PPC_UDBG_16550
 220         help
 221           Select this to enable early debugging for IBM 44x chips via the
 222           inbuilt serial port.
 223
 224 config PPC_EARLY_DEBUG_CPM
 225         bool "Early serial debugging for Freescale CPM-based serial ports"
 226         depends on SERIAL_CPM
 227         select PIN_TLB if PPC_8xx
 228         help
 229           Select this to enable early debugging for Freescale chips
 230           using a CPM-based serial port.  This assumes that the bootwrapper
 231           has run, and set up the CPM in a particular way.
 232
 233 endchoice
 234
 235 config PPC_EARLY_DEBUG_44x_PHYSLOW
 236         hex "Low 32 bits of early debug UART physical address"
 237         depends PPC_EARLY_DEBUG_44x
 238         default "0x40000200"
 239
 240 config PPC_EARLY_DEBUG_44x_PHYSHIGH
 241         hex "EPRN of early debug UART physical address"
 242         depends PPC_EARLY_DEBUG_44x
 243         default "0x1"
 244
 245 config PPC_EARLY_DEBUG_CPM_ADDR
 246         hex "CPM UART early debug transmit descriptor address"
 247         depends on PPC_EARLY_DEBUG_CPM
 248         default "0xfa202808" if PPC_EP88XC
 249         default "0xf0000808" if CPM2
 250         default "0xff002808" if CPM1
 251         help
 252           This specifies the address of the transmit descriptor
 253           used for early debug output.  Because it is needed before
 254           platform probing is done, all platforms selected must
 255           share the same address.
 256
 257 endmenu