arch/sh/Kconfig.debug

   1 menu "Kernel hacking"
   2
   3 config TRACE_IRQFLAGS_SUPPORT
   4         def_bool y
   5
   6 source "lib/Kconfig.debug"
   7
   8 config SH_STANDARD_BIOS
   9         bool "Use LinuxSH standard BIOS"
  10         depends on SUPERH32
  11         help
  12           Say Y here if your target has the gdb-sh-stub
  13           package from www.m17n.org (or any conforming standard LinuxSH BIOS)
  14           in FLASH or EPROM.  The kernel will use standard BIOS calls during
  15           boot for various housekeeping tasks (including calls to read and
  16           write characters to a system console, get a MAC address from an
  17           on-board Ethernet interface, and shut down the hardware).  Note this
  18           does not work with machines with an existing operating system in
  19           mask ROM and no flash (WindowsCE machines fall in this category).
  20           If unsure, say N.
  21
  22 config EARLY_SCIF_CONSOLE
  23         bool "Use early SCIF console"
  24         help
  25           This enables an early console using a fixed SCIF port. This can
  26           be used by platforms that are either not running the SH
  27           standard BIOS, or do not wish to use the BIOS callbacks for the
  28           serial I/O.
  29
  30 config EARLY_SCIF_CONSOLE_PORT
  31         hex
  32         depends on EARLY_SCIF_CONSOLE
  33         default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705
  34         default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721
  35         default "0xf8420000" if CPU_SUBTYPE_SH7619
  36         default "0xff804000" if CPU_SUBTYPE_MXG
  37         default "0xffc30000" if CPU_SUBTYPE_SHX3
  38         default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \
  39                                 CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
  40                                 CPU_SUBTYPE_SH7343
  41         default "0xffeb0000" if CPU_SUBTYPE_SH7785
  42         default "0xffeb0000" if CPU_SUBTYPE_SH7786
  43         default "0xfffe8000" if CPU_SUBTYPE_SH7203
  44         default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
  45         default "0xffe80000" if CPU_SH4
  46         default "0xa4000150" if CPU_SH3
  47         default "0x00000000"
  48
  49 config EARLY_PRINTK
  50         bool "Early printk support"
  51         depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
  52         help
  53           Say Y here to redirect kernel printk messages to the serial port
  54           used by the SH-IPL bootloader, starting very early in the boot
  55           process and ending when the kernel's serial console is initialised.
  56           This option is only useful porting the kernel to a new machine,
  57           when the kernel may crash or hang before the serial console is
  58           initialised. If unsure, say N.
  59
  60           On devices that are running SH-IPL and want to keep the port
  61           initialization consistent while not using the BIOS callbacks,
  62           select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
  63           the kernel command line option to toggle back and forth.
  64
  65 config STACK_DEBUG
  66         bool "Check for stack overflows"
  67         depends on DEBUG_KERNEL && SUPERH32
  68         help
  69           This option will cause messages to be printed if free stack space
  70           drops below a certain limit. Saying Y here will add overhead to
  71           every function call and will therefore incur a major
  72           performance hit. Most users should say N.
  73
  74 config DEBUG_STACK_USAGE
  75         bool "Stack utilization instrumentation"
  76         depends on DEBUG_KERNEL
  77         help
  78           Enables the display of the minimum amount of free stack which each
  79           task has ever had available in the sysrq-T and sysrq-P debug output.
  80
  81           This option will slow down process creation somewhat.
  82
  83 config 4KSTACKS
  84         bool "Use 4Kb for kernel stacks instead of 8Kb"
  85         depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
  86         help
  87           If you say Y here the kernel will use a 4Kb stacksize for the
  88           kernel stack attached to each process/thread. This facilitates
  89           running more threads on a system and also reduces the pressure
  90           on the VM subsystem for higher order allocations. This option
  91           will also use IRQ stacks to compensate for the reduced stackspace.
  92
  93 config IRQSTACKS
  94         bool "Use separate kernel stacks when processing interrupts"
  95         depends on DEBUG_KERNEL && SUPERH32 && BROKEN
  96         help
  97           If you say Y here the kernel will use separate kernel stacks
  98           for handling hard and soft interrupts.  This can help avoid
  99           overflowing the process kernel stacks.
 100
 101 config DUMP_CODE
 102         bool "Show disassembly of nearby code in register dumps"
 103         depends on DEBUG_KERNEL && SUPERH32
 104         default y if DEBUG_BUGVERBOSE
 105         default n
 106         help
 107           This prints out a code trace of the instructions leading up to
 108           the faulting instruction as a debugging aid. As this does grow
 109           the kernel in size a bit, most users will want to say N here.
 110
 111           Those looking for more verbose debugging output should say Y.
 112
 113 config DWARF_UNWINDER
 114         bool "Enable the DWARF unwinder for stacktraces"
 115         select FRAME_POINTER
 116         default n
 117         help
 118           Enabling this option will make stacktraces more accurate, at
 119           the cost of an increase in overall kernel size.
 120
 121 config SH_NO_BSS_INIT
 122         bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
 123         depends on DEBUG_KERNEL
 124         default n
 125         help
 126           If running in painfully slow environments, such as an RTL
 127           simulation or from remote memory via SHdebug, where the memory
 128           can already be gauranteed to ber zeroed on boot, say Y.
 129
 130           For all other cases, say N. If this option seems perplexing, or
 131           you aren't sure, say N.
 132
 133 config SH64_SR_WATCH
 134         bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
 135         depends on SUPERH64
 136
 137 config MCOUNT
 138         def_bool y
 139         depends on SUPERH32
 140         depends on STACK_DEBUG || FUNCTION_TRACER
 141
 142 endmenu