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 depends on SUPERH32 9 help 10 Say Y here if your target has the gdb-sh-stub 11 package from www.m17n.org (or any conforming standard LinuxSH BIOS) 12 in FLASH or EPROM. The kernel will use standard BIOS calls during 13 boot for various housekeeping tasks (including calls to read and 14 write characters to a system console, get a MAC address from an 15 on-board Ethernet interface, and shut down the hardware). Note this 16 does not work with machines with an existing operating system in 17 mask ROM and no flash (WindowsCE machines fall in this category). 18 If unsure, say N. 19 20config STACK_DEBUG 21 bool "Check for stack overflows" 22 depends on DEBUG_KERNEL && SUPERH32 23 help 24 This option will cause messages to be printed if free stack space 25 drops below a certain limit. Saying Y here will add overhead to 26 every function call and will therefore incur a major 27 performance hit. Most users should say N. 28 29config EARLY_PRINTK 30 bool "Early printk" 31 depends on SH_STANDARD_BIOS 32 help 33 Say Y here to redirect kernel printk messages to the serial port 34 used by the SH-IPL bootloader, starting very early in the boot 35 process and ending when the kernel's serial console is initialised. 36 This option is only useful while porting the kernel to a new machine, 37 when the kernel may crash or hang before the serial console is 38 initialised. If unsure, say N. 39 40config 4KSTACKS 41 bool "Use 4Kb for kernel stacks instead of 8Kb" 42 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB 43 help 44 If you say Y here the kernel will use a 4Kb stacksize for the 45 kernel stack attached to each process/thread. This facilitates 46 running more threads on a system and also reduces the pressure 47 on the VM subsystem for higher order allocations. This option 48 will also use IRQ stacks to compensate for the reduced stackspace. 49 50config IRQSTACKS 51 bool "Use separate kernel stacks when processing interrupts" 52 depends on DEBUG_KERNEL && SUPERH32 && BROKEN 53 help 54 If you say Y here the kernel will use separate kernel stacks 55 for handling hard and soft interrupts. This can help avoid 56 overflowing the process kernel stacks. 57 58config DUMP_CODE 59 bool "Show disassembly of nearby code in register dumps" 60 depends on DEBUG_KERNEL && SUPERH32 61 default y if DEBUG_BUGVERBOSE 62 default n 63 help 64 This prints out a code trace of the instructions leading up to 65 the faulting instruction as a debugging aid. As this does grow 66 the kernel in size a bit, most users will want to say N here. 67 68 Those looking for more verbose debugging output should say Y. 69 70config DWARF_UNWINDER 71 bool "Enable the DWARF unwinder for stacktraces" 72 depends on DEBUG_KERNEL 73 select FRAME_POINTER 74 depends on SUPERH32 75 default n 76 help 77 Enabling this option will make stacktraces more accurate, at 78 the cost of an increase in overall kernel size. 79 80config SH_NO_BSS_INIT 81 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" 82 depends on DEBUG_KERNEL 83 default n 84 help 85 If running in painfully slow environments, such as an RTL 86 simulation or from remote memory via SHdebug, where the memory 87 can already be guaranteed to ber zeroed on boot, say Y. 88 89 For all other cases, say N. If this option seems perplexing, or 90 you aren't sure, say N. 91 92config SH64_SR_WATCH 93 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace" 94 depends on SUPERH64 95 96config MCOUNT 97 def_bool y 98 depends on SUPERH32 99 depends on STACK_DEBUG || FUNCTION_TRACER 100