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b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | |
1da177e4 LT |
3 | config SH_STANDARD_BIOS |
4 | bool "Use LinuxSH standard BIOS" | |
5 | help | |
6 | Say Y here if your target has the gdb-sh-stub | |
7 | package from www.m17n.org (or any conforming standard LinuxSH BIOS) | |
8 | in FLASH or EPROM. The kernel will use standard BIOS calls during | |
9 | boot for various housekeeping tasks (including calls to read and | |
10 | write characters to a system console, get a MAC address from an | |
11 | on-board Ethernet interface, and shut down the hardware). Note this | |
12 | does not work with machines with an existing operating system in | |
13 | mask ROM and no flash (WindowsCE machines fall in this category). | |
14 | If unsure, say N. | |
15 | ||
9f14b84a | 16 | config STACK_DEBUG |
d153ea88 | 17 | bool "Check for stack overflows" |
37744fee | 18 | depends on DEBUG_KERNEL |
d153ea88 PM |
19 | help |
20 | This option will cause messages to be printed if free stack space | |
9f14b84a PM |
21 | drops below a certain limit. Saying Y here will add overhead to |
22 | every function call and will therefore incur a major | |
23 | performance hit. Most users should say N. | |
d153ea88 | 24 | |
a6a31139 PM |
25 | config 4KSTACKS |
26 | bool "Use 4Kb for kernel stacks instead of 8Kb" | |
b817f7e0 | 27 | depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB |
a6a31139 PM |
28 | help |
29 | If you say Y here the kernel will use a 4Kb stacksize for the | |
30 | kernel stack attached to each process/thread. This facilitates | |
31 | running more threads on a system and also reduces the pressure | |
32 | on the VM subsystem for higher order allocations. This option | |
33 | will also use IRQ stacks to compensate for the reduced stackspace. | |
34 | ||
110ed282 PM |
35 | config IRQSTACKS |
36 | bool "Use separate kernel stacks when processing interrupts" | |
37744fee | 37 | depends on DEBUG_KERNEL && BROKEN |
110ed282 PM |
38 | help |
39 | If you say Y here the kernel will use separate kernel stacks | |
40 | for handling hard and soft interrupts. This can help avoid | |
41 | overflowing the process kernel stacks. | |
42 | ||
5d2685d0 PM |
43 | config DUMP_CODE |
44 | bool "Show disassembly of nearby code in register dumps" | |
37744fee | 45 | depends on DEBUG_KERNEL |
5d2685d0 PM |
46 | default y if DEBUG_BUGVERBOSE |
47 | default n | |
48 | help | |
49 | This prints out a code trace of the instructions leading up to | |
50 | the faulting instruction as a debugging aid. As this does grow | |
51 | the kernel in size a bit, most users will want to say N here. | |
52 | ||
53 | Those looking for more verbose debugging output should say Y. | |
54 | ||
bd353861 MF |
55 | config DWARF_UNWINDER |
56 | bool "Enable the DWARF unwinder for stacktraces" | |
fda1bc53 | 57 | depends on DEBUG_KERNEL |
bd353861 MF |
58 | select FRAME_POINTER |
59 | default n | |
60 | help | |
61 | Enabling this option will make stacktraces more accurate, at | |
62 | the cost of an increase in overall kernel size. | |
63 | ||
740a3e67 PM |
64 | config SH_NO_BSS_INIT |
65 | bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)" | |
66 | depends on DEBUG_KERNEL | |
67 | default n | |
68 | help | |
69 | If running in painfully slow environments, such as an RTL | |
70 | simulation or from remote memory via SHdebug, where the memory | |
25985edc | 71 | can already be guaranteed to ber zeroed on boot, say Y. |
740a3e67 PM |
72 | |
73 | For all other cases, say N. If this option seems perplexing, or | |
74 | you aren't sure, say N. | |
75 | ||
473d1cf4 PM |
76 | config MCOUNT |
77 | def_bool y | |
473d1cf4 | 78 | depends on STACK_DEBUG || FUNCTION_TRACER |