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 "0xffea0000" 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 "0x00000000" 47 48config EARLY_PRINTK 49 bool "Early printk support" 50 depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE 51 help 52 Say Y here to redirect kernel printk messages to the serial port 53 used by the SH-IPL bootloader, starting very early in the boot 54 process and ending when the kernel's serial console is initialised. 55 This option is only useful porting the kernel to a new machine, 56 when the kernel may crash or hang before the serial console is 57 initialised. If unsure, say N. 58 59 On devices that are running SH-IPL and want to keep the port 60 initialization consistent while not using the BIOS callbacks, 61 select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using 62 the kernel command line option to toggle back and forth. 63 64config STACK_DEBUG 65 bool "Check for stack overflows" 66 depends on DEBUG_KERNEL && SUPERH32 67 help 68 This option will cause messages to be printed if free stack space 69 drops below a certain limit. Saying Y here will add overhead to 70 every function call and will therefore incur a major 71 performance hit. Most users should say N. 72 73config DEBUG_STACK_USAGE 74 bool "Stack utilization instrumentation" 75 depends on DEBUG_KERNEL 76 help 77 Enables the display of the minimum amount of free stack which each 78 task has ever had available in the sysrq-T and sysrq-P debug output. 79 80 This option will slow down process creation somewhat. 81 82config 4KSTACKS 83 bool "Use 4Kb for kernel stacks instead of 8Kb" 84 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB 85 help 86 If you say Y here the kernel will use a 4Kb stacksize for the 87 kernel stack attached to each process/thread. This facilitates 88 running more threads on a system and also reduces the pressure 89 on the VM subsystem for higher order allocations. This option 90 will also use IRQ stacks to compensate for the reduced stackspace. 91 92config IRQSTACKS 93 bool "Use separate kernel stacks when processing interrupts" 94 depends on DEBUG_KERNEL && SUPERH32 && BROKEN 95 help 96 If you say Y here the kernel will use separate kernel stacks 97 for handling hard and soft interrupts. This can help avoid 98 overflowing the process kernel stacks. 99 100config DUMP_CODE 101 bool "Show disassembly of nearby code in register dumps" 102 depends on DEBUG_KERNEL && SUPERH32 103 default y if DEBUG_BUGVERBOSE 104 default n 105 help 106 This prints out a code trace of the instructions leading up to 107 the faulting instruction as a debugging aid. As this does grow 108 the kernel in size a bit, most users will want to say N here. 109 110 Those looking for more verbose debugging output should say Y. 111 112config SH_NO_BSS_INIT 113 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" 114 depends on DEBUG_KERNEL 115 default n 116 help 117 If running in painfully slow environments, such as an RTL 118 simulation or from remote memory via SHdebug, where the memory 119 can already be gauranteed to ber zeroed on boot, say Y. 120 121 For all other cases, say N. If this option seems perplexing, or 122 you aren't sure, say N. 123 124config SH64_SR_WATCH 125 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace" 126 depends on SUPERH64 127 128config MCOUNT 129 def_bool y 130 depends on SUPERH32 131 depends on STACK_DEBUG || FUNCTION_TRACER 132 133endmenu 134