License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 08:07:57 -06:00
|
|
|
# SPDX-License-Identifier: GPL-2.0
|
2014-11-06 00:20:19 -07:00
|
|
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config NIOS2
|
|
|
|
def_bool y
|
2017-05-26 11:34:11 -06:00
|
|
|
select TIMER_OF
|
2014-11-06 00:20:19 -07:00
|
|
|
select GENERIC_ATOMIC64
|
|
|
|
select GENERIC_CLOCKEVENTS
|
|
|
|
select GENERIC_CPU_DEVICES
|
|
|
|
select GENERIC_IRQ_PROBE
|
|
|
|
select GENERIC_IRQ_SHOW
|
2017-05-08 03:14:14 -06:00
|
|
|
select GENERIC_STRNCPY_FROM_USER
|
|
|
|
select GENERIC_STRNLEN_USER
|
2014-11-06 00:20:19 -07:00
|
|
|
select HAVE_ARCH_TRACEHOOK
|
2015-02-16 04:26:43 -07:00
|
|
|
select HAVE_ARCH_KGDB
|
2014-11-06 00:20:19 -07:00
|
|
|
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
|
lib/GCD.c: use binary GCD algorithm instead of Euclidean
The binary GCD algorithm is based on the following facts:
1. If a and b are all evens, then gcd(a,b) = 2 * gcd(a/2, b/2)
2. If a is even and b is odd, then gcd(a,b) = gcd(a/2, b)
3. If a and b are all odds, then gcd(a,b) = gcd((a-b)/2, b) = gcd((a+b)/2, b)
Even on x86 machines with reasonable division hardware, the binary
algorithm runs about 25% faster (80% the execution time) than the
division-based Euclidian algorithm.
On platforms like Alpha and ARMv6 where division is a function call to
emulation code, it's even more significant.
There are two variants of the code here, depending on whether a fast
__ffs (find least significant set bit) instruction is available. This
allows the unpredictable branches in the bit-at-a-time shifting loop to
be eliminated.
If fast __ffs is not available, the "even/odd" GCD variant is used.
I use the following code to benchmark:
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define swap(a, b) \
do { \
a ^= b; \
b ^= a; \
a ^= b; \
} while (0)
unsigned long gcd0(unsigned long a, unsigned long b)
{
unsigned long r;
if (a < b) {
swap(a, b);
}
if (b == 0)
return a;
while ((r = a % b) != 0) {
a = b;
b = r;
}
return b;
}
unsigned long gcd1(unsigned long a, unsigned long b)
{
unsigned long r = a | b;
if (!a || !b)
return r;
b >>= __builtin_ctzl(b);
for (;;) {
a >>= __builtin_ctzl(a);
if (a == b)
return a << __builtin_ctzl(r);
if (a < b)
swap(a, b);
a -= b;
}
}
unsigned long gcd2(unsigned long a, unsigned long b)
{
unsigned long r = a | b;
if (!a || !b)
return r;
r &= -r;
while (!(b & r))
b >>= 1;
for (;;) {
while (!(a & r))
a >>= 1;
if (a == b)
return a;
if (a < b)
swap(a, b);
a -= b;
a >>= 1;
if (a & r)
a += b;
a >>= 1;
}
}
unsigned long gcd3(unsigned long a, unsigned long b)
{
unsigned long r = a | b;
if (!a || !b)
return r;
b >>= __builtin_ctzl(b);
if (b == 1)
return r & -r;
for (;;) {
a >>= __builtin_ctzl(a);
if (a == 1)
return r & -r;
if (a == b)
return a << __builtin_ctzl(r);
if (a < b)
swap(a, b);
a -= b;
}
}
unsigned long gcd4(unsigned long a, unsigned long b)
{
unsigned long r = a | b;
if (!a || !b)
return r;
r &= -r;
while (!(b & r))
b >>= 1;
if (b == r)
return r;
for (;;) {
while (!(a & r))
a >>= 1;
if (a == r)
return r;
if (a == b)
return a;
if (a < b)
swap(a, b);
a -= b;
a >>= 1;
if (a & r)
a += b;
a >>= 1;
}
}
static unsigned long (*gcd_func[])(unsigned long a, unsigned long b) = {
gcd0, gcd1, gcd2, gcd3, gcd4,
};
#define TEST_ENTRIES (sizeof(gcd_func) / sizeof(gcd_func[0]))
#if defined(__x86_64__)
#define rdtscll(val) do { \
unsigned long __a,__d; \
__asm__ __volatile__("rdtsc" : "=a" (__a), "=d" (__d)); \
(val) = ((unsigned long long)__a) | (((unsigned long long)__d)<<32); \
} while(0)
static unsigned long long benchmark_gcd_func(unsigned long (*gcd)(unsigned long, unsigned long),
unsigned long a, unsigned long b, unsigned long *res)
{
unsigned long long start, end;
unsigned long long ret;
unsigned long gcd_res;
rdtscll(start);
gcd_res = gcd(a, b);
rdtscll(end);
if (end >= start)
ret = end - start;
else
ret = ~0ULL - start + 1 + end;
*res = gcd_res;
return ret;
}
#else
static inline struct timespec read_time(void)
{
struct timespec time;
clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &time);
return time;
}
static inline unsigned long long diff_time(struct timespec start, struct timespec end)
{
struct timespec temp;
if ((end.tv_nsec - start.tv_nsec) < 0) {
temp.tv_sec = end.tv_sec - start.tv_sec - 1;
temp.tv_nsec = 1000000000ULL + end.tv_nsec - start.tv_nsec;
} else {
temp.tv_sec = end.tv_sec - start.tv_sec;
temp.tv_nsec = end.tv_nsec - start.tv_nsec;
}
return temp.tv_sec * 1000000000ULL + temp.tv_nsec;
}
static unsigned long long benchmark_gcd_func(unsigned long (*gcd)(unsigned long, unsigned long),
unsigned long a, unsigned long b, unsigned long *res)
{
struct timespec start, end;
unsigned long gcd_res;
start = read_time();
gcd_res = gcd(a, b);
end = read_time();
*res = gcd_res;
return diff_time(start, end);
}
#endif
static inline unsigned long get_rand()
{
if (sizeof(long) == 8)
return (unsigned long)rand() << 32 | rand();
else
return rand();
}
int main(int argc, char **argv)
{
unsigned int seed = time(0);
int loops = 100;
int repeats = 1000;
unsigned long (*res)[TEST_ENTRIES];
unsigned long long elapsed[TEST_ENTRIES];
int i, j, k;
for (;;) {
int opt = getopt(argc, argv, "n:r:s:");
/* End condition always first */
if (opt == -1)
break;
switch (opt) {
case 'n':
loops = atoi(optarg);
break;
case 'r':
repeats = atoi(optarg);
break;
case 's':
seed = strtoul(optarg, NULL, 10);
break;
default:
/* You won't actually get here. */
break;
}
}
res = malloc(sizeof(unsigned long) * TEST_ENTRIES * loops);
memset(elapsed, 0, sizeof(elapsed));
srand(seed);
for (j = 0; j < loops; j++) {
unsigned long a = get_rand();
/* Do we have args? */
unsigned long b = argc > optind ? strtoul(argv[optind], NULL, 10) : get_rand();
unsigned long long min_elapsed[TEST_ENTRIES];
for (k = 0; k < repeats; k++) {
for (i = 0; i < TEST_ENTRIES; i++) {
unsigned long long tmp = benchmark_gcd_func(gcd_func[i], a, b, &res[j][i]);
if (k == 0 || min_elapsed[i] > tmp)
min_elapsed[i] = tmp;
}
}
for (i = 0; i < TEST_ENTRIES; i++)
elapsed[i] += min_elapsed[i];
}
for (i = 0; i < TEST_ENTRIES; i++)
printf("gcd%d: elapsed %llu\n", i, elapsed[i]);
k = 0;
srand(seed);
for (j = 0; j < loops; j++) {
unsigned long a = get_rand();
unsigned long b = argc > optind ? strtoul(argv[optind], NULL, 10) : get_rand();
for (i = 1; i < TEST_ENTRIES; i++) {
if (res[j][i] != res[j][0])
break;
}
if (i < TEST_ENTRIES) {
if (k == 0) {
k = 1;
fprintf(stderr, "Error:\n");
}
fprintf(stderr, "gcd(%lu, %lu): ", a, b);
for (i = 0; i < TEST_ENTRIES; i++)
fprintf(stderr, "%ld%s", res[j][i], i < TEST_ENTRIES - 1 ? ", " : "\n");
}
}
if (k == 0)
fprintf(stderr, "PASS\n");
free(res);
return 0;
}
Compiled with "-O2", on "VirtualBox 4.4.0-22-generic #38-Ubuntu x86_64" got:
zhaoxiuzeng@zhaoxiuzeng-VirtualBox:~/develop$ ./gcd -r 500000 -n 10
gcd0: elapsed 10174
gcd1: elapsed 2120
gcd2: elapsed 2902
gcd3: elapsed 2039
gcd4: elapsed 2812
PASS
zhaoxiuzeng@zhaoxiuzeng-VirtualBox:~/develop$ ./gcd -r 500000 -n 10
gcd0: elapsed 9309
gcd1: elapsed 2280
gcd2: elapsed 2822
gcd3: elapsed 2217
gcd4: elapsed 2710
PASS
zhaoxiuzeng@zhaoxiuzeng-VirtualBox:~/develop$ ./gcd -r 500000 -n 10
gcd0: elapsed 9589
gcd1: elapsed 2098
gcd2: elapsed 2815
gcd3: elapsed 2030
gcd4: elapsed 2718
PASS
zhaoxiuzeng@zhaoxiuzeng-VirtualBox:~/develop$ ./gcd -r 500000 -n 10
gcd0: elapsed 9914
gcd1: elapsed 2309
gcd2: elapsed 2779
gcd3: elapsed 2228
gcd4: elapsed 2709
PASS
[akpm@linux-foundation.org: avoid #defining a CONFIG_ variable]
Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@gmail.com>
Signed-off-by: George Spelvin <linux@horizon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-20 18:03:57 -06:00
|
|
|
select CPU_NO_EFFICIENT_FFS
|
2014-11-06 00:20:19 -07:00
|
|
|
|
|
|
|
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
|
|
|
|
|
2014-11-24 01:13:39 -07:00
|
|
|
config NR_CPUS
|
|
|
|
int
|
|
|
|
default "1"
|
|
|
|
|
2014-11-06 00:20:19 -07:00
|
|
|
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"
|
2014-11-24 01:40:04 -07:00
|
|
|
depends on CMDLINE_BOOL
|
2014-11-06 00:20:19 -07:00
|
|
|
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.
|
|
|
|
|
2015-02-10 08:26:34 -07:00
|
|
|
config NIOS2_BOOT_LINK_OFFSET
|
|
|
|
hex "Link address offset for booting"
|
|
|
|
default "0x00500000"
|
|
|
|
help
|
|
|
|
This option allows you to set the link address offset of the zImage.
|
|
|
|
This can be useful if you are on a board which has a small amount of
|
|
|
|
memory.
|
|
|
|
|
2014-11-06 00:20:19 -07:00
|
|
|
endmenu
|
|
|
|
|
|
|
|
menu "Advanced setup"
|
|
|
|
|
|
|
|
config ADVANCED_OPTIONS
|
|
|
|
bool "Prompt for advanced kernel configuration options"
|
|
|
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comment "Default settings for advanced configuration options are used"
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depends on !ADVANCED_OPTIONS
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config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
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bool "Set custom kernel MMU region base address"
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depends on ADVANCED_OPTIONS
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help
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This option allows you to set the virtual address of the kernel MMU region.
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Say N here unless you know what you are doing.
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config NIOS2_KERNEL_MMU_REGION_BASE
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hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
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default "0x80000000"
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help
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This option allows you to set the virtual base address of the kernel MMU region.
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config NIOS2_KERNEL_REGION_BASE_BOOL
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bool "Set custom kernel region base address"
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depends on ADVANCED_OPTIONS
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help
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This option allows you to set the virtual address of the kernel region.
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Say N here unless you know what you are doing.
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config NIOS2_KERNEL_REGION_BASE
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hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
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default "0xc0000000"
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config NIOS2_IO_REGION_BASE_BOOL
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bool "Set custom I/O region base address"
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depends on ADVANCED_OPTIONS
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help
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This option allows you to set the virtual address of the I/O region.
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Say N here unless you know what you are doing.
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config NIOS2_IO_REGION_BASE
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hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
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default "0xe0000000"
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endmenu
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menu "Executable file formats"
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source "fs/Kconfig.binfmt"
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endmenu
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "arch/nios2/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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