config X86_VERBOSE_BOOTUP
bool "Enable verbose x86 bootup info messages"
default y
- ---help---
+ help
Enables the informational output from the decompression stage
(e.g. bzImage) of the boot. If you disable this you will still
see errors. Disable this if you want silent bootup.
config EARLY_PRINTK
bool "Early printk" if EXPERT
default y
- ---help---
+ help
Write kernel log output directly into the VGA buffer or to a serial
port.
bool "Early printk via EHCI debug port"
depends on EARLY_PRINTK && PCI
select EARLY_PRINTK_USB
- ---help---
+ help
Write kernel log output directly into the EHCI debug port.
This is useful for kernel debugging when your machine crashes very
bool "Early printk via the xHCI debug port"
depends on EARLY_PRINTK && PCI
select EARLY_PRINTK_USB
- ---help---
+ help
Write kernel log output directly into the xHCI debug port.
One use for this feature is kernel debugging, for example when your
bool "Dump the EFI pagetable"
depends on EFI
select PTDUMP_CORE
- ---help---
+ help
Enable this if you want to dump the EFI page table before
enabling virtual mode. This can be used to debug miscellaneous
issues with the mapping of the EFI runtime regions into that
config DEBUG_TLBFLUSH
bool "Set upper limit of TLB entries to flush one-by-one"
depends on DEBUG_KERNEL
- ---help---
+ help
X86-only for now.
bool "Enable IOMMU debugging"
depends on GART_IOMMU && DEBUG_KERNEL
depends on X86_64
- ---help---
+ help
Force the IOMMU to on even when you have less than 4GB of
memory and add debugging code. On overflow always panic. And
allow to enable IOMMU leak tracing. Can be disabled at boot
config IOMMU_LEAK
bool "IOMMU leak tracing"
depends on IOMMU_DEBUG && DMA_API_DEBUG
- ---help---
+ help
Add a simple leak tracer to the IOMMU code. This is useful when you
are debugging a buggy device driver that leaks IOMMU mappings.
bool "x86 instruction decoder selftest"
depends on DEBUG_KERNEL && INSTRUCTION_DECODER
depends on !COMPILE_TEST
- ---help---
+ help
Perform x86 instruction decoder selftests at build time.
This option is useful for checking the sanity of x86 instruction
decoder code.
config IO_DELAY_0X80
bool "port 0x80 based port-IO delay [recommended]"
- ---help---
+ help
This is the traditional Linux IO delay used for in/out_p.
It is the most tested hence safest selection here.
config IO_DELAY_0XED
bool "port 0xed based port-IO delay"
- ---help---
+ help
Use port 0xed as the IO delay. This frees up port 0x80 which is
often used as a hardware-debug port.
config IO_DELAY_UDELAY
bool "udelay based port-IO delay"
- ---help---
+ help
Use udelay(2) as the IO delay method. This provides the delay
while not having any side-effect on the IO port space.
config IO_DELAY_NONE
bool "no port-IO delay"
- ---help---
+ help
No port-IO delay. Will break on old boxes that require port-IO
delay for certain operations. Should work on most new machines.
bool "Debug boot parameters"
depends on DEBUG_KERNEL
depends on DEBUG_FS
- ---help---
+ help
This option will cause struct boot_params to be exported via debugfs.
config CPA_DEBUG
bool "CPA self-test code"
depends on DEBUG_KERNEL
- ---help---
+ help
Do change_page_attr() self-tests every 30 seconds.
config DEBUG_ENTRY
bool "Debug low-level entry code"
depends on DEBUG_KERNEL
- ---help---
+ help
This option enables sanity checks in x86's low-level entry code.
Some of these sanity checks may slow down kernel entries and
exits or otherwise impact performance.
config DEBUG_NMI_SELFTEST
bool "NMI Selftest"
depends on DEBUG_KERNEL && X86_LOCAL_APIC
- ---help---
+ help
Enabling this option turns on a quick NMI selftest to verify
that the NMI behaves correctly.
config DEBUG_IMR_SELFTEST
bool "Isolated Memory Region self test"
depends on INTEL_IMR
- ---help---
+ help
This option enables automated sanity testing of the IMR code.
Some simple tests are run to verify IMR bounds checking, alignment
and overlapping. This option is really only useful if you are
bool "Debug the x86 FPU code"
depends on DEBUG_KERNEL
default y
- ---help---
+ help
If this option is enabled then there will be extra sanity
checks and (boot time) debug printouts added to the kernel.
This debugging adds some small amount of runtime overhead
depends on PCI
select DEBUG_FS
select IOSF_MBI
- ---help---
+ help
This is a debug driver, which gets the power states
of all Punit North Complex devices. The power states of
each device is exposed as part of the debugfs interface.
prompt "Choose kernel unwinder"
default UNWINDER_ORC if X86_64
default UNWINDER_FRAME_POINTER if X86_32
- ---help---
+ help
This determines which method will be used for unwinding kernel stack
traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack,
livepatch, lockdep, and more.
bool "ORC unwinder"
depends on X86_64
select STACK_VALIDATION
- ---help---
+ help
This option enables the ORC (Oops Rewind Capability) unwinder for
unwinding kernel stack traces. It uses a custom data format which is
a simplified version of the DWARF Call Frame Information standard.
config UNWINDER_FRAME_POINTER
bool "Frame pointer unwinder"
select FRAME_POINTER
- ---help---
+ help
This option enables the frame pointer unwinder for unwinding kernel
stack traces.
bool "Guess unwinder"
depends on EXPERT
depends on !STACKDEPOT
- ---help---
+ help
This option enables the "guess" unwinder for unwinding kernel stack
traces. It scans the stack and reports every kernel text address it
finds. Some of the addresses it reports may be incorrect.
projects / linux-2.6-microblaze.git / blobdiff