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- # SPDX-License-Identifier: GPL-2.0
- config SH_STANDARD_BIOS
- bool "Use LinuxSH standard BIOS"
- help
- Say Y here if your target has the gdb-sh-stub
- package from www.m17n.org (or any conforming standard LinuxSH BIOS)
- in FLASH or EPROM. The kernel will use standard BIOS calls during
- boot for various housekeeping tasks (including calls to read and
- write characters to a system console, get a MAC address from an
- on-board Ethernet interface, and shut down the hardware). Note this
- does not work with machines with an existing operating system in
- mask ROM and no flash (WindowsCE machines fall in this category).
- If unsure, say N.
- config STACK_DEBUG
- bool "Check for stack overflows"
- depends on DEBUG_KERNEL && PRINTK
- help
- This option will cause messages to be printed if free stack space
- drops below a certain limit. Saying Y here will add overhead to
- every function call and will therefore incur a major
- performance hit. Most users should say N.
- config EARLY_PRINTK
- bool "Early printk"
- depends on SH_STANDARD_BIOS
- help
- Say Y here to redirect kernel printk messages to the serial port
- used by the SH-IPL bootloader, starting very early in the boot
- process and ending when the kernel's serial console is initialised.
- This option is only useful while porting the kernel to a new machine,
- when the kernel may crash or hang before the serial console is
- initialised. If unsure, say N.
- config 4KSTACKS
- bool "Use 4Kb for kernel stacks instead of 8Kb"
- depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
- help
- If you say Y here the kernel will use a 4Kb stacksize for the
- kernel stack attached to each process/thread. This facilitates
- running more threads on a system and also reduces the pressure
- on the VM subsystem for higher order allocations. This option
- will also use IRQ stacks to compensate for the reduced stackspace.
- config IRQSTACKS
- bool "Use separate kernel stacks when processing interrupts"
- depends on DEBUG_KERNEL && BROKEN
- help
- If you say Y here the kernel will use separate kernel stacks
- for handling hard and soft interrupts. This can help avoid
- overflowing the process kernel stacks.
- config DUMP_CODE
- bool "Show disassembly of nearby code in register dumps"
- depends on DEBUG_KERNEL
- default y if DEBUG_BUGVERBOSE
- default n
- help
- This prints out a code trace of the instructions leading up to
- the faulting instruction as a debugging aid. As this does grow
- the kernel in size a bit, most users will want to say N here.
- Those looking for more verbose debugging output should say Y.
- config DWARF_UNWINDER
- bool "Enable the DWARF unwinder for stacktraces"
- depends on DEBUG_KERNEL
- select FRAME_POINTER
- default n
- help
- Enabling this option will make stacktraces more accurate, at
- the cost of an increase in overall kernel size.
- config SH_NO_BSS_INIT
- bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
- depends on DEBUG_KERNEL
- default n
- help
- If running in painfully slow environments, such as an RTL
- simulation or from remote memory via SHdebug, where the memory
- can already be guaranteed to ber zeroed on boot, say Y.
- For all other cases, say N. If this option seems perplexing, or
- you aren't sure, say N.
- config MCOUNT
- def_bool y
- depends on STACK_DEBUG || FUNCTION_TRACER
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