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 && PRINTK
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 EARLY_PRINTK
29	bool "Early printk"
30	depends on SH_STANDARD_BIOS
31	help
32	  Say Y here to redirect kernel printk messages to the serial port
33	  used by the SH-IPL bootloader, starting very early in the boot
34	  process and ending when the kernel's serial console is initialised.
35	  This option is only useful while porting the kernel to a new machine,
36	  when the kernel may crash or hang before the serial console is
37	  initialised.  If unsure, say N.
38
39config 4KSTACKS
40	bool "Use 4Kb for kernel stacks instead of 8Kb"
41	depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
42	help
43	  If you say Y here the kernel will use a 4Kb stacksize for the
44	  kernel stack attached to each process/thread. This facilitates
45	  running more threads on a system and also reduces the pressure
46	  on the VM subsystem for higher order allocations. This option
47	  will also use IRQ stacks to compensate for the reduced stackspace.
48
49config IRQSTACKS
50	bool "Use separate kernel stacks when processing interrupts"
51	depends on DEBUG_KERNEL && BROKEN
52	help
53	  If you say Y here the kernel will use separate kernel stacks
54	  for handling hard and soft interrupts.  This can help avoid
55	  overflowing the process kernel stacks.
56
57config DUMP_CODE
58	bool "Show disassembly of nearby code in register dumps"
59	depends on DEBUG_KERNEL
60	default y if DEBUG_BUGVERBOSE
61	default n
62	help
63	  This prints out a code trace of the instructions leading up to
64	  the faulting instruction as a debugging aid. As this does grow
65	  the kernel in size a bit, most users will want to say N here.
66
67	  Those looking for more verbose debugging output should say Y.
68
69config DWARF_UNWINDER
70	bool "Enable the DWARF unwinder for stacktraces"
71	depends on DEBUG_KERNEL
72	select FRAME_POINTER
73	default n
74	help
75	  Enabling this option will make stacktraces more accurate, at
76	  the cost of an increase in overall kernel size.
77
78config SH_NO_BSS_INIT
79	bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
80	depends on DEBUG_KERNEL
81	default n
82	help
83	  If running in painfully slow environments, such as an RTL
84	  simulation or from remote memory via SHdebug, where the memory
85	  can already be guaranteed to ber zeroed on boot, say Y.
86
87	  For all other cases, say N. If this option seems perplexing, or
88	  you aren't sure, say N.
89
90config MCOUNT
91	def_bool y
92	depends on STACK_DEBUG || FUNCTION_TRACER
93