5d2685d0b3
We don't really want this enabled by default, but it is still quite useful for debugging. So, make it conditional and leave it off by default. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
149 lines
5.3 KiB
Plaintext
149 lines
5.3 KiB
Plaintext
menu "Kernel hacking"
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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source "lib/Kconfig.debug"
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config SH_STANDARD_BIOS
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bool "Use LinuxSH standard BIOS"
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depends on SUPERH32
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help
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Say Y here if your target has the gdb-sh-stub
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package from www.m17n.org (or any conforming standard LinuxSH BIOS)
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in FLASH or EPROM. The kernel will use standard BIOS calls during
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boot for various housekeeping tasks (including calls to read and
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write characters to a system console, get a MAC address from an
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on-board Ethernet interface, and shut down the hardware). Note this
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does not work with machines with an existing operating system in
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mask ROM and no flash (WindowsCE machines fall in this category).
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If unsure, say N.
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config EARLY_SCIF_CONSOLE
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bool "Use early SCIF console"
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help
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This enables an early console using a fixed SCIF port. This can
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be used by platforms that are either not running the SH
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standard BIOS, or do not wish to use the BIOS callbacks for the
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serial I/O.
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config EARLY_SCIF_CONSOLE_PORT
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hex
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depends on EARLY_SCIF_CONSOLE
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default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705
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default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721
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default "0xf8420000" if CPU_SUBTYPE_SH7619
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default "0xff804000" if CPU_SUBTYPE_MXG
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default "0xffc30000" if CPU_SUBTYPE_SHX3
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default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \
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CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \
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CPU_SUBTYPE_SH7343
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default "0xffe80000" if CPU_SH4
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default "0xffea0000" if CPU_SUBTYPE_SH7785
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default "0xfffe8000" if CPU_SUBTYPE_SH7203
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default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263
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default "0x00000000"
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config EARLY_PRINTK
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bool "Early printk support"
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depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE
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help
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Say Y here to redirect kernel printk messages to the serial port
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used by the SH-IPL bootloader, starting very early in the boot
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process and ending when the kernel's serial console is initialised.
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This option is only useful porting the kernel to a new machine,
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when the kernel may crash or hang before the serial console is
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initialised. If unsure, say N.
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On devices that are running SH-IPL and want to keep the port
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initialization consistent while not using the BIOS callbacks,
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select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using
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the kernel command line option to toggle back and forth.
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config DEBUG_BOOTMEM
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depends on DEBUG_KERNEL
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bool "Debug BOOTMEM initialization"
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config DEBUG_STACKOVERFLOW
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bool "Check for stack overflows"
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depends on DEBUG_KERNEL && SUPERH32
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help
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This option will cause messages to be printed if free stack space
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drops below a certain limit.
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config DEBUG_STACK_USAGE
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bool "Stack utilization instrumentation"
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depends on DEBUG_KERNEL
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help
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Enables the display of the minimum amount of free stack which each
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task has ever had available in the sysrq-T and sysrq-P debug output.
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This option will slow down process creation somewhat.
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config 4KSTACKS
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bool "Use 4Kb for kernel stacks instead of 8Kb"
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depends on DEBUG_KERNEL && (MMU || BROKEN) && !PAGE_SIZE_64KB
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help
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If you say Y here the kernel will use a 4Kb stacksize for the
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kernel stack attached to each process/thread. This facilitates
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running more threads on a system and also reduces the pressure
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on the VM subsystem for higher order allocations. This option
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will also use IRQ stacks to compensate for the reduced stackspace.
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config IRQSTACKS
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bool "Use separate kernel stacks when processing interrupts"
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depends on DEBUG_KERNEL && SUPERH32
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help
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If you say Y here the kernel will use separate kernel stacks
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for handling hard and soft interrupts. This can help avoid
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overflowing the process kernel stacks.
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config DUMP_CODE
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bool "Show disassembly of nearby code in register dumps"
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depends on DEBUG_KERNEL && SUPERH32
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default y if DEBUG_BUGVERBOSE
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default n
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help
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This prints out a code trace of the instructions leading up to
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the faulting instruction as a debugging aid. As this does grow
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the kernel in size a bit, most users will want to say N here.
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Those looking for more verbose debugging output should say Y.
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config SH_NO_BSS_INIT
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bool "Avoid zeroing BSS (to speed-up startup on suitable platforms)"
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depends on DEBUG_KERNEL
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default n
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help
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If running in painfully slow environments, such as an RTL
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simulation or from remote memory via SHdebug, where the memory
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can already be gauranteed to ber zeroed on boot, say Y.
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For all other cases, say N. If this option seems perplexing, or
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you aren't sure, say N.
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config MORE_COMPILE_OPTIONS
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bool "Add any additional compile options"
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help
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If you want to add additional CFLAGS to the kernel build, enable this
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option and then enter what you would like to add in the next question.
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Note however that -g is already appended with the selection of KGDB.
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config COMPILE_OPTIONS
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string "Additional compile arguments"
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depends on MORE_COMPILE_OPTIONS
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config SH64_SR_WATCH
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bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
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depends on SUPERH64
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config POOR_MANS_STRACE
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bool "Debug: enable rudimentary strace facility"
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depends on SUPERH64
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help
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This option allows system calls to be traced to the console. It also
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aids in detecting kernel stack underflow. It is useful for debugging
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early-userland problems (e.g. init incurring fatal exceptions.)
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endmenu
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