Commit 2fc8483f authored by Ley Foon Tan's avatar Ley Foon Tan

nios2: Build infrastructure

This patch adds Makefile and Kconfig files required for building a
nios2 kernel.
Signed-off-by: default avatarLey Foon Tan <lftan@altera.com>
parent 9cce02ec
config NIOS2
def_bool y
select ARCH_WANT_OPTIONAL_GPIOLIB
select CLKSRC_OF
select GENERIC_ATOMIC64
select GENERIC_CLOCKEVENTS
select GENERIC_CPU_DEVICES
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select HAVE_ARCH_TRACEHOOK
select IRQ_DOMAIN
select MODULES_USE_ELF_RELA
select OF
select OF_EARLY_FLATTREE
select SOC_BUS
select SPARSE_IRQ
select USB_ARCH_HAS_HCD if USB_SUPPORT
config GENERIC_CSUM
def_bool y
config GENERIC_HWEIGHT
def_bool y
config GENERIC_CALIBRATE_DELAY
def_bool y
config NO_IOPORT_MAP
def_bool y
config HAS_DMA
def_bool y
config FPU
def_bool n
config SWAP
def_bool n
config RWSEM_GENERIC_SPINLOCK
def_bool y
config TRACE_IRQFLAGS_SUPPORT
def_bool n
source "init/Kconfig"
menu "Kernel features"
source "kernel/Kconfig.preempt"
source "kernel/Kconfig.freezer"
source "kernel/Kconfig.hz"
source "mm/Kconfig"
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
range 9 20
default "11"
help
The kernel memory allocator divides physically contiguous memory
blocks into "zones", where each zone is a power of two number of
pages. This option selects the largest power of two that the kernel
keeps in the memory allocator. If you need to allocate very large
blocks of physically contiguous memory, then you may need to
increase this value.
This config option is actually maximum order plus one. For example,
a value of 11 means that the largest free memory block is 2^10 pages.
endmenu
source "arch/nios2/platform/Kconfig.platform"
menu "Processor type and features"
config MMU
def_bool y
config NIOS2_ALIGNMENT_TRAP
bool "Catch alignment trap"
default y
help
Nios II CPUs cannot fetch/store data which is not bus aligned,
i.e., a 2 or 4 byte fetch must start at an address divisible by
2 or 4. Any non-aligned load/store instructions will be trapped and
emulated in software if you say Y here, which has a performance
impact.
comment "Boot options"
config CMDLINE_BOOL
bool "Default bootloader kernel arguments"
default y
config CMDLINE
string "Default kernel command string"
default ""
depends on CMDLINE_BOOL
help
On some platforms, there is currently no way for the boot loader to
pass arguments to the kernel. For these platforms, you can supply
some command-line options at build time by entering them here. In
other cases you can specify kernel args so that you don't have
to set them up in board prom initialization routines.
config CMDLINE_FORCE
bool "Force default kernel command string"
depends on CMDLINE_BOOL
help
Set this to have arguments from the default kernel command string
override those passed by the boot loader.
config NIOS2_CMDLINE_IGNORE_DTB
bool "Ignore kernel command string from DTB"
depends on !CMDLINE_FORCE
default y
help
Set this to ignore the bootargs property from the devicetree's
chosen node and fall back to CMDLINE if nothing is passed.
config NIOS2_PASS_CMDLINE
bool "Passed kernel command line from u-boot"
default n
help
Use bootargs env variable from u-boot for kernel command line.
will override "Default kernel command string".
Say N if you are unsure.
endmenu
menu "Advanced setup"
config ADVANCED_OPTIONS
bool "Prompt for advanced kernel configuration options"
help
comment "Default settings for advanced configuration options are used"
depends on !ADVANCED_OPTIONS
config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
bool "Set custom kernel MMU region base address"
depends on ADVANCED_OPTIONS
help
This option allows you to set the virtual address of the kernel MMU region.
Say N here unless you know what you are doing.
config NIOS2_KERNEL_MMU_REGION_BASE
hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
default "0x80000000"
help
This option allows you to set the virtual base address of the kernel MMU region.
config NIOS2_KERNEL_REGION_BASE_BOOL
bool "Set custom kernel region base address"
depends on ADVANCED_OPTIONS
help
This option allows you to set the virtual address of the kernel region.
Say N here unless you know what you are doing.
config NIOS2_KERNEL_REGION_BASE
hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
default "0xc0000000"
config NIOS2_IO_REGION_BASE_BOOL
bool "Set custom I/O region base address"
depends on ADVANCED_OPTIONS
help
This option allows you to set the virtual address of the I/O region.
Say N here unless you know what you are doing.
config NIOS2_IO_REGION_BASE
hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
default "0xe0000000"
endmenu
menu "Executable file formats"
source "fs/Kconfig.binfmt"
endmenu
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
source "arch/nios2/Kconfig.debug"
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"
menu "Kernel hacking"
config TRACE_IRQFLAGS_SUPPORT
def_bool y
source "lib/Kconfig.debug"
config DEBUG_STACK_USAGE
bool "Enable 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.
endmenu
#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 2013 Altera Corporation
# Copyright (C) 1994, 95, 96, 2003 by Wind River Systems
# Written by Fredrik Markstrom
#
# This file is included by the global makefile so that you can add your own
# architecture-specific flags and dependencies. Remember to do have actions
# for "archclean" cleaning up for this architecture.
#
# Nios2 port by Wind River Systems Inc trough:
# fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com
UTS_SYSNAME = Linux
export MMU
LIBGCC := $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)
KBUILD_CFLAGS += -pipe -D__linux__ -D__ELF__
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MUL_SUPPORT),-mhw-mul,-mno-hw-mul)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_MULX_SUPPORT),-mhw-mulx,-mno-hw-mulx)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_HW_DIV_SUPPORT),-mhw-div,-mno-hw-div)
KBUILD_CFLAGS += $(if $(CONFIG_NIOS2_FPU_SUPPORT),-mcustom-fpu-cfg=60-1,)
KBUILD_CFLAGS += -fno-optimize-sibling-calls
KBUILD_CFLAGS += -DUTS_SYSNAME=\"$(UTS_SYSNAME)\"
KBUILD_CFLAGS += -fno-builtin
KBUILD_CFLAGS += -G 0
head-y := arch/nios2/kernel/head.o
libs-y += arch/nios2/lib/ $(LIBGCC)
core-y += arch/nios2/kernel/ arch/nios2/mm/
core-y += arch/nios2/platform/
INSTALL_PATH ?= /tftpboot
nios2-boot := arch/$(ARCH)/boot
BOOT_TARGETS = vmImage zImage
PHONY += $(BOOT_TARGETS) install
KBUILD_IMAGE := $(nios2-boot)/vmImage
ifneq ($(CONFIG_NIOS2_DTB_SOURCE),"")
core-y += $(nios2-boot)/
endif
all: vmImage
archclean:
$(Q)$(MAKE) $(clean)=$(nios2-boot)
%.dtb:
$(Q)$(MAKE) $(build)=$(nios2-boot) $(nios2-boot)/$@
dtbs:
$(Q)$(MAKE) $(build)=$(nios2-boot) $(nios2-boot)/$@
$(BOOT_TARGETS): vmlinux
$(Q)$(MAKE) $(build)=$(nios2-boot) $(nios2-boot)/$@
install:
$(Q)$(MAKE) $(build)=$(nios2-boot) BOOTIMAGE=$(KBUILD_IMAGE) install
define archhelp
echo '* vmImage - Kernel-only image for U-Boot ($(KBUILD_IMAGE))'
echo ' install - Install kernel using'
echo ' (your) ~/bin/$(INSTALLKERNEL) or'
echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
echo ' install to $$(INSTALL_PATH)'
echo ' dtbs - Build device tree blobs for enabled boards'
endef
#
# arch/nios2/boot/Makefile
#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
UIMAGE_LOADADDR = $(shell $(NM) vmlinux | awk '$$NF == "_stext" {print $$1}')
UIMAGE_ENTRYADDR = $(shell $(NM) vmlinux | awk '$$NF == "_start" {print $$1}')
UIMAGE_COMPRESSION = gzip
OBJCOPYFLAGS_vmlinux.bin := -O binary
targets += vmlinux.bin vmlinux.gz vmImage
$(obj)/vmlinux.bin: vmlinux FORCE
$(call if_changed,objcopy)
$(obj)/vmlinux.gz: $(obj)/vmlinux.bin FORCE
$(call if_changed,gzip)
$(obj)/vmImage: $(obj)/vmlinux.gz
$(call if_changed,uimage)
@$(kecho) 'Kernel: $@ is ready'
# Rule to build device tree blobs
DTB_SRC := $(patsubst "%",%,$(CONFIG_NIOS2_DTB_SOURCE))
# Make sure the generated dtb gets removed during clean
extra-$(CONFIG_NIOS2_DTB_SOURCE_BOOL) += system.dtb
$(obj)/system.dtb: $(DTB_SRC) FORCE
$(call cmd,dtc)
# Ensure system.dtb exists
$(obj)/linked_dtb.o: $(obj)/system.dtb
obj-$(CONFIG_NIOS2_DTB_SOURCE_BOOL) += linked_dtb.o
targets += $(dtb-y)
# Rule to build device tree blobs with make command
$(obj)/%.dtb: $(src)/dts/%.dts FORCE
$(call if_changed_dep,dtc)
$(obj)/dtbs: $(addprefix $(obj)/, $(dtb-y))
clean-files := *.dtb
install:
sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $(BOOTIMAGE) System.map "$(INSTALL_PATH)"
#!/bin/sh
#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
# Copyright (C) 1995 by Linus Torvalds
#
# Adapted from code in arch/i386/boot/Makefile by H. Peter Anvin
#
# "make install" script for nios2 architecture
#
# Arguments:
# $1 - kernel version
# $2 - kernel image file
# $3 - kernel map file
# $4 - default install path (blank if root directory)
#
verify () {
if [ ! -f "$1" ]; then
echo "" 1>&2
echo " *** Missing file: $1" 1>&2
echo ' *** You need to run "make" before "make install".' 1>&2
echo "" 1>&2
exit 1
fi
}
# Make sure the files actually exist
verify "$2"
verify "$3"
# User may have a custom install script
if [ -x ~/bin/${INSTALLKERNEL} ]; then exec ~/bin/${INSTALLKERNEL} "$@"; fi
if [ -x /sbin/${INSTALLKERNEL} ]; then exec /sbin/${INSTALLKERNEL} "$@"; fi
# Default install - same as make zlilo
if [ -f $4/vmlinuz ]; then
mv $4/vmlinuz $4/vmlinuz.old
fi
if [ -f $4/System.map ]; then
mv $4/System.map $4/System.old
fi
cat $2 > $4/vmlinuz
cp $3 $4/System.map
sync
CONFIG_SYSVIPC=y
CONFIG_NO_HZ_IDLE=y
CONFIG_BSD_PROCESS_ACCT=y
CONFIG_LOG_BUF_SHIFT=14
CONFIG_SYSCTL_SYSCALL=y
# CONFIG_ELF_CORE is not set
# CONFIG_EPOLL is not set
# CONFIG_SIGNALFD is not set
# CONFIG_TIMERFD is not set
# CONFIG_EVENTFD is not set
# CONFIG_SHMEM is not set
# CONFIG_AIO is not set
CONFIG_EMBEDDED=y
CONFIG_SLAB=y
CONFIG_MODULES=y
CONFIG_MODULE_UNLOAD=y
CONFIG_NIOS2_MEM_BASE=0x10000000
CONFIG_NIOS2_HW_MUL_SUPPORT=y
CONFIG_NIOS2_HW_DIV_SUPPORT=y
CONFIG_CUSTOM_CACHE_SETTINGS=y
CONFIG_NIOS2_DCACHE_SIZE=0x8000
CONFIG_NIOS2_ICACHE_SIZE=0x8000
# CONFIG_NIOS2_CMDLINE_IGNORE_DTB is not set
CONFIG_NIOS2_PASS_CMDLINE=y
CONFIG_NET=y
CONFIG_PACKET=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_MULTICAST=y
CONFIG_IP_PNP=y
CONFIG_IP_PNP_DHCP=y
CONFIG_IP_PNP_BOOTP=y
CONFIG_IP_PNP_RARP=y
# CONFIG_INET_XFRM_MODE_TRANSPORT is not set
# CONFIG_INET_XFRM_MODE_TUNNEL is not set
# CONFIG_INET_XFRM_MODE_BEET is not set
# CONFIG_INET_LRO is not set
# CONFIG_IPV6 is not set
# CONFIG_WIRELESS is not set
CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
CONFIG_DEVTMPFS=y
CONFIG_DEVTMPFS_MOUNT=y
# CONFIG_FW_LOADER is not set
CONFIG_MTD=y
CONFIG_MTD_CMDLINE_PARTS=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_CFI=y
CONFIG_MTD_CFI_INTELEXT=y
CONFIG_MTD_CFI_AMDSTD=y
CONFIG_MTD_PHYSMAP_OF=y
CONFIG_BLK_DEV_LOOP=y
CONFIG_NETDEVICES=y
CONFIG_ALTERA_TSE=y
CONFIG_MARVELL_PHY=y
# CONFIG_WLAN is not set
# CONFIG_INPUT_MOUSE is not set
# CONFIG_SERIO_SERPORT is not set
# CONFIG_VT is not set
CONFIG_SERIAL_ALTERA_JTAGUART=y
CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE=y
CONFIG_SERIAL_ALTERA_UART=y
# CONFIG_HW_RANDOM is not set
# CONFIG_HWMON is not set
# CONFIG_USB_SUPPORT is not set
CONFIG_NEW_LEDS=y
CONFIG_LEDS_CLASS=y
CONFIG_LEDS_TRIGGERS=y
CONFIG_LEDS_TRIGGER_HEARTBEAT=y
# CONFIG_DNOTIFY is not set
# CONFIG_INOTIFY_USER is not set
CONFIG_JFFS2_FS=y
CONFIG_NFS_FS=y
CONFIG_NFS_V3_ACL=y
CONFIG_ROOT_NFS=y
CONFIG_SUNRPC_DEBUG=y
CONFIG_DEBUG_INFO=y
# CONFIG_ENABLE_WARN_DEPRECATED is not set
generic-y += atomic.h
generic-y += auxvec.h
generic-y += barrier.h
generic-y += bitops.h
generic-y += bitsperlong.h
generic-y += bug.h
generic-y += bugs.h
generic-y += clkdev.h
generic-y += cputime.h
generic-y += current.h
generic-y += device.h
generic-y += div64.h
generic-y += dma.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
generic-y += fb.h
generic-y += fcntl.h
generic-y += ftrace.h
generic-y += futex.h
generic-y += hardirq.h
generic-y += hash.h
generic-y += hw_irq.h
generic-y += ioctl.h
generic-y += ioctls.h
generic-y += ipcbuf.h
generic-y += irq_regs.h
generic-y += irq_work.h
generic-y += kdebug.h
generic-y += kmap_types.h
generic-y += kvm_para.h
generic-y += local.h
generic-y += mcs_spinlock.h
generic-y += mman.h
generic-y += module.h
generic-y += msgbuf.h
generic-y += param.h
generic-y += pci.h
generic-y += percpu.h
generic-y += poll.h
generic-y += posix_types.h
generic-y += preempt.h
generic-y += resource.h
generic-y += scatterlist.h
generic-y += sections.h
generic-y += segment.h
generic-y += sembuf.h
generic-y += serial.h
generic-y += shmbuf.h
generic-y += shmparam.h
generic-y += siginfo.h
generic-y += signal.h
generic-y += socket.h
generic-y += sockios.h
generic-y += spinlock.h
generic-y += stat.h
generic-y += statfs.h
generic-y += termbits.h
generic-y += termios.h
generic-y += topology.h
generic-y += trace_clock.h
generic-y += types.h
generic-y += unaligned.h
generic-y += user.h
generic-y += vga.h
generic-y += xor.h
include include/uapi/asm-generic/Kbuild.asm
header-y += elf.h
header-y += ucontext.h
#
# Makefile for the nios2 linux kernel.
#
extra-y += head.o
extra-y += vmlinux.lds
obj-y += cpuinfo.o
obj-y += entry.o
obj-y += insnemu.o
obj-y += irq.o
obj-y += nios2_ksyms.o
obj-y += process.o
obj-y += prom.o
obj-y += ptrace.o
obj-y += setup.o
obj-y += signal.o
obj-y += sys_nios2.o
obj-y += syscall_table.o
obj-y += time.o
obj-y += traps.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_NIOS2_ALIGNMENT_TRAP) += misaligned.o
/*
* Copyright (C) 2004 Microtronix Datacom Ltd
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*/
#include <linux/export.h>
#include <linux/string.h>
/* string functions */
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(memmove);
/*
* libgcc functions - functions that are used internally by the
* compiler... (prototypes are not correct though, but that
* doesn't really matter since they're not versioned).
*/
#define DECLARE_EXPORT(name) extern void name(void); EXPORT_SYMBOL(name)
DECLARE_EXPORT(__gcc_bcmp);
DECLARE_EXPORT(__divsi3);
DECLARE_EXPORT(__moddi3);
DECLARE_EXPORT(__modsi3);
DECLARE_EXPORT(__udivmoddi4);
DECLARE_EXPORT(__udivsi3);
DECLARE_EXPORT(__umoddi3);
DECLARE_EXPORT(__umodsi3);
DECLARE_EXPORT(__muldi3);
/*
* Copyright (C) 2009 Thomas Chou <thomas@wytron.com.tw>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <asm/page.h>
#include <asm-generic/vmlinux.lds.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
OUTPUT_FORMAT("elf32-littlenios2", "elf32-littlenios2", "elf32-littlenios2")
OUTPUT_ARCH(nios)
ENTRY(_start) /* Defined in head.S */
jiffies = jiffies_64;
SECTIONS
{
. = CONFIG_NIOS2_MEM_BASE | CONFIG_NIOS2_KERNEL_REGION_BASE;
_text = .;
_stext = .;
HEAD_TEXT_SECTION
.text : {
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
IRQENTRY_TEXT
KPROBES_TEXT
} =0
_etext = .;
.got : {
*(.got.plt)
*(.igot.plt)
*(.got)
*(.igot)
}
EXCEPTION_TABLE(L1_CACHE_BYTES)
. = ALIGN(PAGE_SIZE);
__init_begin = .;
INIT_TEXT_SECTION(PAGE_SIZE)
INIT_DATA_SECTION(PAGE_SIZE)
PERCPU_SECTION(L1_CACHE_BYTES)
__init_end = .;
_sdata = .;
RO_DATA_SECTION(PAGE_SIZE)
RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
_edata = .;
BSS_SECTION(0, 0, 0)
_end = .;
STABS_DEBUG
DWARF_DEBUG
NOTES
DISCARDS
}
#
# Makefile for Nios2-specific library files.
#
lib-y += delay.o
lib-y += memcpy.o
lib-y += memmove.o
lib-y += memset.o
#
# Makefile for the Nios2-specific parts of the memory manager.
#
obj-y += cacheflush.o
obj-y += dma-mapping.o
obj-y += extable.o
obj-y += fault.o
obj-y += init.o
obj-y += ioremap.o
obj-y += mmu_context.o
obj-y += pgtable.o
obj-y += tlb.o
obj-y += uaccess.o
menu "Platform options"
comment "Memory settings"
config NIOS2_MEM_BASE
hex "Memory base address"
default "0x00000000"
help
This is the physical address of the memory that the kernel will run
from. This address is used to link the kernel and setup initial memory
management. You should take the raw memory address without any MMU
or cache bits set.
Please not that this address is used directly so you have to manually
do address translation if it's connected to a bridge.
comment "Device tree"
config NIOS2_DTB_AT_PHYS_ADDR
bool "DTB at physical address"
default n
help
When enabled you can select a physical address to load the dtb from.
Normally this address is passed by a bootloader such as u-boot but
using this you can use a devicetree without a bootloader.
This way you can store a devicetree in NOR flash or an onchip rom.
Please note that this address is used directly so you have to manually
do address translation if it's connected to a bridge. Also take into
account that when using an MMU you'd have to ad 0xC0000000 to your
address
config NIOS2_DTB_PHYS_ADDR
hex "DTB Address"
depends on NIOS2_DTB_AT_PHYS_ADDR
default "0xC0000000"
help
Physical address of a dtb blob.
config NIOS2_DTB_SOURCE_BOOL
bool "Compile and link device tree into kernel image"
default n
help
This allows you to specify a dts (device tree source) file
which will be compiled and linked into the kernel image.
config NIOS2_DTB_SOURCE
string "Device tree source file"
depends on NIOS2_DTB_SOURCE_BOOL
default ""
help
Absolute path to the device tree source (dts) file describing your
system.
comment "Nios II instructions"
config NIOS2_HW_MUL_SUPPORT
bool "Enable MUL instruction"
default n
help
Set to true if you configured the Nios II to include the MUL
instruction. This will enable the -mhw-mul compiler flag.
config NIOS2_HW_MULX_SUPPORT
bool "Enable MULX instruction"
default n
help
Set to true if you configured the Nios II to include the MULX
instruction. Enables the -mhw-mulx compiler flag.
config NIOS2_HW_DIV_SUPPORT
bool "Enable DIV instruction"
default n
help
Set to true if you configured the Nios II to include the DIV
instruction. Enables the -mhw-div compiler flag.
config NIOS2_FPU_SUPPORT
bool "Custom floating point instr support"
default n
help
Enables the -mcustom-fpu-cfg=60-1 compiler flag.
config NIOS2_CI_SWAB_SUPPORT
bool "Byteswap custom instruction"
default n
help
Use the byteswap (endian converter) Nios II custom instruction provided
by Altera and which can be enabled in QSYS builder. This accelerates
endian conversions in the kernel (e.g. ntohs).
config NIOS2_CI_SWAB_NO
int "Byteswap custom instruction number" if NIOS2_CI_SWAB_SUPPORT
default 0
help
Number of the instruction as configured in QSYS Builder.
comment "Cache settings"
config CUSTOM_CACHE_SETTINGS
bool "Custom cache settings"
help
This option allows you to tweak the cache settings used during early
boot (where the information from device tree is not yet available).
There should be no reason to change these values. Linux will work
perfectly fine, even if the Nios II is configured with smaller caches.
Say N here unless you know what you are doing.
config NIOS2_DCACHE_SIZE
hex "D-Cache size" if CUSTOM_CACHE_SETTINGS
range 0x200 0x10000
default "0x800"
help
Maximum possible data cache size.
config NIOS2_DCACHE_LINE_SIZE
hex "D-Cache line size" if CUSTOM_CACHE_SETTINGS
range 0x10 0x20
default "0x20"
help
Minimum possible data cache line size.
config NIOS2_ICACHE_SIZE
hex "I-Cache size" if CUSTOM_CACHE_SETTINGS
range 0x200 0x10000
default "0x1000"
help
Maximum possible instruction cache size.
endmenu
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