| menu "Kernel hacking" |
| |
| config TRACE_IRQFLAGS_SUPPORT |
| def_bool y |
| |
| source "lib/Kconfig.debug" |
| |
| config SH_STANDARD_BIOS |
| bool "Use LinuxSH standard BIOS" |
| depends on SUPERH32 |
| 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 EARLY_SCIF_CONSOLE |
| bool "Use early SCIF console" |
| help |
| This enables an early console using a fixed SCIF port. This can |
| be used by platforms that are either not running the SH |
| standard BIOS, or do not wish to use the BIOS callbacks for the |
| serial I/O. |
| |
| config EARLY_SCIF_CONSOLE_PORT |
| hex |
| depends on EARLY_SCIF_CONSOLE |
| default "0xa4400000" if CPU_SUBTYPE_SH7712 || CPU_SUBTYPE_SH7705 |
| default "0xa4430000" if CPU_SUBTYPE_SH7720 || CPU_SUBTYPE_SH7721 |
| default "0xf8420000" if CPU_SUBTYPE_SH7619 |
| default "0xff804000" if CPU_SUBTYPE_MXG |
| default "0xffc30000" if CPU_SUBTYPE_SHX3 |
| default "0xffe00000" if CPU_SUBTYPE_SH7780 || CPU_SUBTYPE_SH7763 || \ |
| CPU_SUBTYPE_SH7722 || CPU_SUBTYPE_SH7366 || \ |
| CPU_SUBTYPE_SH7343 |
| default "0xfe4c0000" if CPU_SUBTYPE_SH7757 |
| default "0xffeb0000" if CPU_SUBTYPE_SH7785 |
| default "0xffeb0000" if CPU_SUBTYPE_SH7786 |
| default "0xfffe8000" if CPU_SUBTYPE_SH7203 |
| default "0xfffe9800" if CPU_SUBTYPE_SH7206 || CPU_SUBTYPE_SH7263 |
| default "0xffe80000" if CPU_SH4 |
| default "0xa4000150" if CPU_SH3 |
| default "0x00000000" |
| |
| config EARLY_PRINTK |
| bool "Early printk support" |
| depends on SH_STANDARD_BIOS || EARLY_SCIF_CONSOLE |
| 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 porting the kernel to a new machine, |
| when the kernel may crash or hang before the serial console is |
| initialised. If unsure, say N. |
| |
| On devices that are running SH-IPL and want to keep the port |
| initialization consistent while not using the BIOS callbacks, |
| select both the EARLY_SCIF_CONSOLE and SH_STANDARD_BIOS, using |
| the kernel command line option to toggle back and forth. |
| |
| config STACK_DEBUG |
| bool "Check for stack overflows" |
| depends on DEBUG_KERNEL && SUPERH32 |
| 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 DEBUG_STACK_USAGE |
| bool "Stack utilization instrumentation" |
| depends on DEBUG_KERNEL |
| help |
| Enables the display of the minimum amount of free stack which each |
| task has ever had available in the sysrq-T and sysrq-P debug output. |
| |
| This option will slow down process creation somewhat. |
| |
| 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 && SUPERH32 && 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 && SUPERH32 |
| 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" |
| 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 gauranteed 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 SH64_SR_WATCH |
| bool "Debug: set SR.WATCH to enable hardware watchpoints and trace" |
| depends on SUPERH64 |
| |
| config MCOUNT |
| def_bool y |
| depends on SUPERH32 |
| depends on STACK_DEBUG || FUNCTION_TRACER |
| |
| endmenu |
