| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | menu "Kernel hacking" |
| 2 | |
| 3 | source "lib/Kconfig.debug" |
| 4 | |
| 5 | config EARLY_PRINTK |
| 6 | bool "Early printk" |
| 7 | depends on EMBEDDED && DEBUG_KERNEL |
| 8 | default n |
| 9 | help |
| 10 | Write kernel log output directly into the VGA buffer or to a serial |
| 11 | port. |
| 12 | |
| 13 | This is useful for kernel debugging when your machine crashes very |
| 14 | early before the console code is initialized. For normal operation |
| 15 | it is not recommended because it looks ugly and doesn't cooperate |
| 16 | with klogd/syslogd or the X server. You should normally N here, |
| 17 | unless you want to debug such a crash. |
| 18 | |
| 19 | config DEBUG_STACKOVERFLOW |
| 20 | bool "Check for stack overflows" |
| 21 | depends on DEBUG_KERNEL |
| 22 | |
| 23 | config DEBUG_PAGEALLOC |
| 24 | bool "Page alloc debugging" |
| 25 | depends on DEBUG_KERNEL |
| 26 | help |
| 27 | Unmap pages from the kernel linear mapping after free_pages(). |
| 28 | This results in a large slowdown, but helps to find certain types |
| 29 | of memory corruptions. |
| 30 | |
| 31 | config GDBSTUB |
| 32 | bool "Remote GDB kernel debugging" |
| 33 | depends on DEBUG_KERNEL |
| 34 | select DEBUG_INFO |
| 35 | select FRAME_POINTER |
| 36 | help |
| 37 | If you say Y here, it will be possible to remotely debug the kernel |
| 38 | using gdb. This enlarges your kernel ELF image disk size by several |
| 39 | megabytes and requires a machine with more than 16 MB, better 32 MB |
| 40 | RAM to avoid excessive linking time. This is only useful for kernel |
| 41 | hackers. If unsure, say N. |
| 42 | |
| 43 | choice |
| 44 | prompt "GDB stub port" |
| 45 | default GDBSTUB_UART1 |
| 46 | depends on GDBSTUB |
| 47 | help |
| 48 | Select the on-CPU port used for GDB-stub |
| 49 | |
| 50 | config GDBSTUB_UART0 |
| 51 | bool "/dev/ttyS0" |
| 52 | |
| 53 | config GDBSTUB_UART1 |
| 54 | bool "/dev/ttyS1" |
| 55 | |
| 56 | endchoice |
| 57 | |
| 58 | config GDBSTUB_IMMEDIATE |
| 59 | bool "Break into GDB stub immediately" |
| 60 | depends on GDBSTUB |
| 61 | help |
| 62 | If you say Y here, GDB stub will break into the program as soon as |
| 63 | possible, leaving the program counter at the beginning of |
| 64 | start_kernel() in init/main.c. |
| 65 | |
| 66 | config GDB_CONSOLE |
| 67 | bool "Console output to GDB" |
| 68 | depends on GDBSTUB |
| 69 | help |
| 70 | If you are using GDB for remote debugging over a serial port and |
| 71 | would like kernel messages to be formatted into GDB $O packets so |
| 72 | that GDB prints them as program output, say 'Y'. |
| 73 | |
| 74 | endmenu |