forked from mirrors/linux
553f7ac78f
The SuperH BIOS earlyprintk code is protected by CONFIG_EARLY_PRINTK. However, when this protection was added, it was missed that SuperH no longer defines an EARLY_PRINTK config symbol since commite76fe57447("sh: Remove old early serial console code V2"), so BIOS earlyprintk can no longer be used. Fix this by reviving the EARLY_PRINTK config symbol. Fixes:d0380e6c3c("early_printk: consolidate random copies of identical code") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Link: https://lore.kernel.org/r/c40972dfec3dcc6719808d5df388857360262878.1697708489.git.geert+renesas@glider.be Signed-off-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
89 lines
3.3 KiB
Text
89 lines
3.3 KiB
Text
# 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
|