1menu "Kernel hacking" 2 3config TRACE_IRQFLAGS_SUPPORT 4 def_bool y 5 6source "lib/Kconfig.debug" 7 8config 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 22config 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 30config 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 "0xfe4c0000" if CPU_SUBTYPE_SH7757 42 default "0xffeb0000" if CPU_SUBTYPE_SH7785 43 default "0xffeb0000" if CPU_SUBTYPE_SH7786 44 default "0xfffe8000" if CPU_SUBTYPE_SH7203 45 default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263 46 default "0xffe80000" if CPU_SH4 47 default "0xa4000150" if CPU_SH3 48 default "0x00000000" 49 50config EARLY_PRINTK 51 bool "Early printk support" 52 depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE 53 help 54 Say Y here to redirect kernel printk messages to the serial port 55 used by the SH-IPL bootloader, starting very early in the boot 56 process and ending when the kernel's serial console is initialised. 57 This option is only useful porting the kernel to a new machine, 58 when the kernel may crash or hang before the serial console is 59 initialised. If unsure, say N. 60 61 On devices that are running SH-IPL and want to keep the port 62 initialization consistent while not using the BIOS callbacks, 63 select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using 64 the kernel command line option to toggle back and forth. 65 66config STACK_DEBUG 67 bool "Check for stack overflows" 68 depends on DEBUG_KERNEL && SUPERH32 69 help 70 This option will cause messages to be printed if free stack space 71 drops below a certain limit. Saying Y here will add overhead to 72 every function call and will therefore incur a major 73 performance hit. Most users should say N. 74 75config DEBUG_STACK_USAGE 76 bool "Stack utilization instrumentation" 77 depends on DEBUG_KERNEL 78 help 79 Enables the display of the minimum amount of free stack which each 80 task has ever had available in the sysrq-T and sysrq-P debug output. 81 82 This option will slow down process creation somewhat. 83 84config 4KSTACKS 85 bool "Use 4Kb for kernel stacks instead of 8Kb" 86 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB 87 help 88 If you say Y here the kernel will use a 4Kb stacksize for the 89 kernel stack attached to each process/thread. This facilitates 90 running more threads on a system and also reduces the pressure 91 on the VM subsystem for higher order allocations. This option 92 will also use IRQ stacks to compensate for the reduced stackspace. 93 94config IRQSTACKS 95 bool "Use separate kernel stacks when processing interrupts" 96 depends on DEBUG_KERNEL && SUPERH32 && BROKEN 97 help 98 If you say Y here the kernel will use separate kernel stacks 99 for handling hard and soft interrupts. This can help avoid 100 overflowing the process kernel stacks. 101 102config DUMP_CODE 103 bool "Show disassembly of nearby code in register dumps" 104 depends on DEBUG_KERNEL && SUPERH32 105 default y if DEBUG_BUGVERBOSE 106 default n 107 help 108 This prints out a code trace of the instructions leading up to 109 the faulting instruction as a debugging aid. As this does grow 110 the kernel in size a bit, most users will want to say N here. 111 112 Those looking for more verbose debugging output should say Y. 113 114config DWARF_UNWINDER 115 bool "Enable the DWARF unwinder for stacktraces" 116 select FRAME_POINTER 117 default n 118 help 119 Enabling this option will make stacktraces more accurate, at 120 the cost of an increase in overall kernel size. 121 122config SH_NO_BSS_INIT 123 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" 124 depends on DEBUG_KERNEL 125 default n 126 help 127 If running in painfully slow environments, such as an RTL 128 simulation or from remote memory via SHdebug, where the memory 129 can already be gauranteed to ber zeroed on boot, say Y. 130 131 For all other cases, say N. If this option seems perplexing, or 132 you aren't sure, say N. 133 134config SH64_SR_WATCH 135 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace" 136 depends on SUPERH64 137 138config MCOUNT 139 def_bool y 140 depends on SUPERH32 141 depends on STACK_DEBUG || FUNCTION_TRACER 142 143endmenu 144