1# SPDX-License-Identifier: GPL-2.0 2 3config TRACE_IRQFLAGS_SUPPORT 4 def_bool y 5 6config SH_STANDARD_BIOS 7 bool "Use LinuxSH standard BIOS" 8 help 9 Say Y here if your target has the gdb-sh-stub 10 package from www.m17n.org (or any conforming standard LinuxSH BIOS) 11 in FLASH or EPROM. The kernel will use standard BIOS calls during 12 boot for various housekeeping tasks (including calls to read and 13 write characters to a system console, get a MAC address from an 14 on-board Ethernet interface, and shut down the hardware). Note this 15 does not work with machines with an existing operating system in 16 mask ROM and no flash (WindowsCE machines fall in this category). 17 If unsure, say N. 18 19config STACK_DEBUG 20 bool "Check for stack overflows" 21 depends on DEBUG_KERNEL 22 help 23 This option will cause messages to be printed if free stack space 24 drops below a certain limit. Saying Y here will add overhead to 25 every function call and will therefore incur a major 26 performance hit. Most users should say N. 27 28config 4KSTACKS 29 bool "Use 4Kb for kernel stacks instead of 8Kb" 30 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB 31 help 32 If you say Y here the kernel will use a 4Kb stacksize for the 33 kernel stack attached to each process/thread. This facilitates 34 running more threads on a system and also reduces the pressure 35 on the VM subsystem for higher order allocations. This option 36 will also use IRQ stacks to compensate for the reduced stackspace. 37 38config IRQSTACKS 39 bool "Use separate kernel stacks when processing interrupts" 40 depends on DEBUG_KERNEL && BROKEN 41 help 42 If you say Y here the kernel will use separate kernel stacks 43 for handling hard and soft interrupts. This can help avoid 44 overflowing the process kernel stacks. 45 46config DUMP_CODE 47 bool "Show disassembly of nearby code in register dumps" 48 depends on DEBUG_KERNEL 49 default y if DEBUG_BUGVERBOSE 50 default n 51 help 52 This prints out a code trace of the instructions leading up to 53 the faulting instruction as a debugging aid. As this does grow 54 the kernel in size a bit, most users will want to say N here. 55 56 Those looking for more verbose debugging output should say Y. 57 58config DWARF_UNWINDER 59 bool "Enable the DWARF unwinder for stacktraces" 60 select FRAME_POINTER 61 default n 62 help 63 Enabling this option will make stacktraces more accurate, at 64 the cost of an increase in overall kernel size. 65 66config SH_NO_BSS_INIT 67 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" 68 depends on DEBUG_KERNEL 69 default n 70 help 71 If running in painfully slow environments, such as an RTL 72 simulation or from remote memory via SHdebug, where the memory 73 can already be guaranteed to ber zeroed on boot, say Y. 74 75 For all other cases, say N. If this option seems perplexing, or 76 you aren't sure, say N. 77 78config MCOUNT 79 def_bool y 80 depends on STACK_DEBUG || FUNCTION_TRACER 81