1 # SPDX-License-Identifier: GPL-2.0
3 config TRACE_IRQFLAGS_SUPPORT
6 config SH_STANDARD_BIOS
7 bool "Use LinuxSH standard BIOS"
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).
21 bool "Check for stack overflows"
22 depends on DEBUG_KERNEL && SUPERH32
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.
31 depends on SH_STANDARD_BIOS
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.
41 bool "Use 4Kb for kernel stacks instead of 8Kb"
42 depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
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.
51 bool "Use separate kernel stacks when processing interrupts"
52 depends on DEBUG_KERNEL && SUPERH32 && BROKEN
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.
59 bool "Show disassembly of nearby code in register dumps"
60 depends on DEBUG_KERNEL && SUPERH32
61 default y if DEBUG_BUGVERBOSE
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.
68 Those looking for more verbose debugging output should say Y.
71 bool "Enable the DWARF unwinder for stacktraces"
72 depends on DEBUG_KERNEL
77 Enabling this option will make stacktraces more accurate, at
78 the cost of an increase in overall kernel size.
81 bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
82 depends on DEBUG_KERNEL
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.
89 For all other cases, say N. If this option seems perplexing, or
90 you aren't sure, say N.
93 bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
99 depends on STACK_DEBUG || FUNCTION_TRACER