1 # SPDX-License-Identifier: GPL-2.0
3 config TRACE_IRQFLAGS_SUPPORT
6 config SH_STANDARD_BIOS
7 bool "Use LinuxSH standard BIOS"
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).
20 bool "Check for stack overflows"
21 depends on DEBUG_KERNEL && PRINTK
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.
30 depends on SH_STANDARD_BIOS
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.
40 bool "Use 4Kb for kernel stacks instead of 8Kb"
41 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
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.
50 bool "Use separate kernel stacks when processing interrupts"
51 depends on DEBUG_KERNEL && BROKEN
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.
58 bool "Show disassembly of nearby code in register dumps"
59 depends on DEBUG_KERNEL
60 default y if DEBUG_BUGVERBOSE
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.
67 Those looking for more verbose debugging output should say Y.
70 bool "Enable the DWARF unwinder for stacktraces"
71 depends on DEBUG_KERNEL
75 Enabling this option will make stacktraces more accurate, at
76 the cost of an increase in overall kernel size.
79 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
80 depends on DEBUG_KERNEL
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.
87 For all other cases, say N. If this option seems perplexing, or
88 you aren't sure, say N.
92 depends on STACK_DEBUG || FUNCTION_TRACER