162 lines
5.4 KiB
Plaintext
162 lines
5.4 KiB
Plaintext
menu "Kernel hacking"
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source "lib/Kconfig.debug"
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config STRICT_DEVMEM
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bool "Filter access to /dev/mem"
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depends on MMU
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---help---
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If this option is disabled, you allow userspace (root) access to all
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of memory, including kernel and userspace memory. Accidental
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access to this is obviously disastrous, but specific access can
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be used by people debugging the kernel.
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If this option is switched on, the /dev/mem file only allows
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userspace access to memory mapped peripherals.
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If in doubt, say Y.
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# RMK wants arm kernels compiled with frame pointers or stack unwinding.
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# If you know what you are doing and are willing to live without stack
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# traces, you can get a slightly smaller kernel by setting this option to
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# n, but then RMK will have to kill you ;).
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config FRAME_POINTER
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bool
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depends on !THUMB2_KERNEL
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default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
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help
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If you say N here, the resulting kernel will be slightly smaller and
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faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
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when a problem occurs with the kernel, the information that is
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reported is severely limited.
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config ARM_UNWIND
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bool "Enable stack unwinding support (EXPERIMENTAL)"
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depends on AEABI && EXPERIMENTAL
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default y
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help
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This option enables stack unwinding support in the kernel
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using the information automatically generated by the
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compiler. The resulting kernel image is slightly bigger but
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the performance is not affected. Currently, this feature
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only works with EABI compilers. If unsure say Y.
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config OLD_MCOUNT
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bool
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depends on FUNCTION_TRACER && FRAME_POINTER
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default y
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config DEBUG_USER
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bool "Verbose user fault messages"
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help
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When a user program crashes due to an exception, the kernel can
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print a brief message explaining what the problem was. This is
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sometimes helpful for debugging but serves no purpose on a
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production system. Most people should say N here.
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In addition, you need to pass user_debug=N on the kernel command
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line to enable this feature. N consists of the sum of:
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1 - undefined instruction events
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2 - system calls
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4 - invalid data aborts
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8 - SIGSEGV faults
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16 - SIGBUS faults
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# These options are only for real kernel hackers who want to get their hands dirty.
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config DEBUG_LL
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bool "Kernel low-level debugging functions (read help!)"
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depends on DEBUG_KERNEL
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help
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Say Y here to include definitions of printascii, printch, printhex
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in the kernel. This is helpful if you are debugging code that
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executes before the console is initialized.
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Note that selecting this option will limit the kernel to a single
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UART definition, as specified below. Attempting to boot the kernel
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image on a different platform *will not work*, so this option should
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not be enabled for kernels that are intended to be portable.
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choice
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prompt "Kernel low-level debugging port"
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depends on DEBUG_LL
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config DEBUG_LL_UART_NONE
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bool "No low-level debugging UART"
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help
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Say Y here if your platform doesn't provide a UART option
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below. This relies on your platform choosing the right UART
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definition internally in order for low-level debugging to
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work.
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config DEBUG_ICEDCC
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bool "Kernel low-level debugging via EmbeddedICE DCC channel"
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help
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Say Y here if you want the debug print routines to direct
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their output to the EmbeddedICE macrocell's DCC channel using
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co-processor 14. This is known to work on the ARM9 style ICE
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channel and on the XScale with the PEEDI.
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Note that the system will appear to hang during boot if there
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is nothing connected to read from the DCC.
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config DEBUG_FOOTBRIDGE_COM1
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bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
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depends on FOOTBRIDGE
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help
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Say Y here if you want the debug print routines to direct
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their output to the 8250 at PCI COM1.
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config DEBUG_DC21285_PORT
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bool "Kernel low-level debugging messages via footbridge serial port"
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depends on FOOTBRIDGE
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help
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Say Y here if you want the debug print routines to direct
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their output to the serial port in the DC21285 (Footbridge).
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config DEBUG_CLPS711X_UART1
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bool "Kernel low-level debugging messages via UART1"
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depends on ARCH_CLPS711X
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help
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Say Y here if you want the debug print routines to direct
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their output to the first serial port on these devices.
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config DEBUG_CLPS711X_UART2
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bool "Kernel low-level debugging messages via UART2"
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depends on ARCH_CLPS711X
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help
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Say Y here if you want the debug print routines to direct
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their output to the second serial port on these devices.
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endchoice
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config EARLY_PRINTK
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bool "Early printk"
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depends on DEBUG_LL
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help
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Say Y here if you want to have an early console using the
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kernel low-level debugging functions. Add earlyprintk to your
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kernel parameters to enable this console.
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config OC_ETM
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bool "On-chip ETM and ETB"
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depends on ARM_AMBA
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help
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Enables the on-chip embedded trace macrocell and embedded trace
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buffer driver that will allow you to collect traces of the
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kernel code.
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config DEBUG_S3C_UART
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depends on PLAT_SAMSUNG
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int "S3C UART to use for low-level debug"
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default "0"
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help
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Choice for UART for kernel low-level using S3C UARTS,
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should be between zero and two. The port must have been
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initialised by the boot-loader before use.
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The uncompressor code port configuration is now handled
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by CONFIG_S3C_LOWLEVEL_UART_PORT.
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endmenu
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