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 "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 49config 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 65config 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 74config 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 83config 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 93config 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 101config 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 113config 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 121config 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 133config SH64_SR_WATCH 134 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace" 135 depends on SUPERH64 136 137config MCOUNT 138 def_bool y 139 depends on SUPERH32 140 depends on STACK_DEBUG || FUNCTION_TRACER 141 142endmenu 143