1 menu "Library routines"
4 bool "Enable support for non-identity virtual-physical mappings"
6 Enables helper code for implementing non-identity virtual-physical
7 memory mappings for 32bit CPUs.
9 config SYS_NUM_ADDR_MAP
10 int "Size of the address-map table"
14 Sets the number of entries in the virtual-physical mapping table.
17 bool "Enable Software based BCH ECC"
19 Enables software based BCH ECC algorithm present in lib/bch.c
20 This is used by SoC platforms which do not have built-in ELM
21 hardware engine required for BCH ECC correction.
24 bool "Allow access to binman information in the device tree"
25 depends on BINMAN && OF_CONTROL
28 This enables U-Boot to access information about binman entries,
29 stored in the device tree in a binman node. Typical uses are to
30 locate entries in the firmware image. See binman.h for the available
33 config CC_OPTIMIZE_LIBS_FOR_SPEED
34 bool "Optimize libraries for speed"
36 Enabling this option will pass "-O2" to gcc when compiling
37 under "lib" directory.
41 config DYNAMIC_CRC_TABLE
42 bool "Enable Dynamic tables for CRC"
44 Enable this option to calculate entries for CRC tables at runtime.
45 This can be helpful when reducing the size of the build image
47 config HAVE_ARCH_IOMAP
50 Enable this option if architecture provides io{read,write}{8,16,32}
51 I/O accessor functions.
53 config HAVE_PRIVATE_LIBGCC
66 select SPL_STRTO if !SPL_USE_TINY_PRINTF
71 select TPL_STRTO if !TPL_USE_TINY_PRINTF
100 config IMAGE_SPARSE_FILLBUF_SIZE
101 hex "Android sparse image CHUNK_TYPE_FILL buffer size"
103 depends on IMAGE_SPARSE
105 Set the size of the fill buffer used when processing CHUNK_TYPE_FILL
108 config USE_PRIVATE_LIBGCC
109 bool "Use private libgcc"
110 depends on HAVE_PRIVATE_LIBGCC
111 default y if HAVE_PRIVATE_LIBGCC && ((ARM && !ARM64) || MIPS)
113 This option allows you to use the built-in libgcc implementation
114 of U-Boot instead of the one provided by the compiler.
121 The frequency of the timer returned by get_timer().
122 get_timer() must operate in milliseconds and this option must be
125 config SPL_USE_TINY_PRINTF
126 bool "Enable tiny printf() version in SPL"
130 This option enables a tiny, stripped down printf version.
131 This should only be used in space limited environments,
132 like SPL versions with hard memory limits. This version
133 reduces the code size by about 2.5KiB on armv7.
135 The supported format specifiers are %c, %s, %u/%d and %x.
137 config TPL_USE_TINY_PRINTF
138 bool "Enable tiny printf() version in TPL"
140 default y if SPL_USE_TINY_PRINTF
142 This option enables a tiny, stripped down printf version.
143 This should only be used in space limited environments,
144 like SPL versions with hard memory limits. This version
145 reduces the code size by about 2.5KiB on armv7.
147 The supported format specifiers are %c, %s, %u/%d and %x.
150 bool "Do not reset the system on fatal error"
152 Define this option to stop the system in case of a fatal error,
153 so that you have to reset it manually. This is probably NOT a good
154 idea for an embedded system where you want the system to reboot
155 automatically as fast as possible, but it may be useful during
156 development since you can try to debug the conditions that lead to
160 bool "Enable regular expression support"
163 If this variable is defined, U-Boot is linked against the
164 SLRE (Super Light Regular Expression) library, which adds
165 regex support to some commands, for example "env grep" and
169 prompt "Pseudo-random library support type"
170 depends on NET_RANDOM_ETHADDR || RANDOM_UUID || CMD_UUID || \
171 RNG_SANDBOX || UT_LIB && AES || FAT_WRITE
174 Select the library to provide pseudo-random number generator
175 functions. LIB_HW_RAND supports certain hardware engines that
176 provide this functionality. If in doubt, select LIB_RAND.
179 bool "Pseudo-random library support"
182 bool "HW Engine for random library support"
186 config SPL_TINY_MEMSET
187 bool "Use a very small memset() in SPL"
189 The faster memset() is the arch-specific one (if available) enabled
190 by CONFIG_USE_ARCH_MEMSET. If that is not enabled, we can still get
191 better performance by writing a word at a time. But in very
192 size-constrained environments even this may be too big. Enable this
193 option to reduce code size slightly at the cost of some speed.
195 config TPL_TINY_MEMSET
196 bool "Use a very small memset() in TPL"
198 The faster memset() is the arch-specific one (if available) enabled
199 by CONFIG_USE_ARCH_MEMSET. If that is not enabled, we can still get
200 better performance by writing a word at a time. But in very
201 size-constrained environments even this may be too big. Enable this
202 option to reduce code size slightly at the cost of some speed.
208 bool "Bit reverse library from Linux"
211 bool "Support for tracing of function calls and timing"
214 Enables function tracing within U-Boot. This allows recording of call
215 traces including timing information. The command can write data to
216 memory for exporting for analysis (e.g. using bootchart).
217 See doc/README.trace for full details.
219 config TRACE_BUFFER_SIZE
220 hex "Size of trace buffer in U-Boot"
224 Sets the size of the trace buffer in U-Boot. This is allocated from
225 memory during relocation. If this buffer is too small, the trace
226 history will be truncated, with later records omitted.
228 If early trace is enabled (i.e. before relocation), this buffer must
229 be large enough to include all the data from the early trace buffer as
230 well, since this is copied over to the main buffer during relocation.
232 A trace record is emitted for each function call and each record is
233 12 bytes (see struct trace_call). A suggested minimum size is 1MB. If
234 the size is too small then 'trace stats' will show a message saying
235 how many records were dropped due to buffer overflow.
237 config TRACE_CALL_DEPTH_LIMIT
238 int "Trace call depth limit"
242 Sets the maximum call depth up to which function calls are recorded.
245 bool "Enable tracing before relocation"
248 Sometimes it is helpful to trace execution of U-Boot before
249 relocation. This is possible by using a arch-specific, fixed buffer
250 position in memory. Enable this option to start tracing as early as
251 possible after U-Boot starts.
253 config TRACE_EARLY_SIZE
254 hex "Size of early trace buffer in U-Boot"
255 depends on TRACE_EARLY
258 Sets the size of the early trace buffer in bytes. This is used to hold
259 tracing information before relocation.
261 config TRACE_EARLY_CALL_DEPTH_LIMIT
262 int "Early trace call depth limit"
263 depends on TRACE_EARLY
266 Sets the maximum call depth up to which function calls are recorded
267 during early tracing.
269 config TRACE_EARLY_ADDR
270 hex "Address of early trace buffer in U-Boot"
271 depends on TRACE_EARLY
274 Sets the address of the early trace buffer in U-Boot. This memory
275 must be accessible before relocation.
277 A trace record is emitted for each function call and each record is
278 12 bytes (see struct trace_call). A suggested minimum size is 1MB. If
279 the size is too small then the message which says the amount of early
280 data being coped will the the same as the
282 source lib/dhry/Kconfig
284 menu "Security support"
287 bool "Support the AES algorithm"
289 This provides a means to encrypt and decrypt data using the AES
290 (Advanced Encryption Standard). This algorithm uses a symetric key
291 and is widely used as a streaming cipher. Different key lengths are
292 supported by the algorithm but only a 128-bit key is supported at
295 source lib/rsa/Kconfig
296 source lib/crypto/Kconfig
299 bool "Trusted Platform Module (TPM) Support"
302 This enables support for TPMs which can be used to provide security
303 features for your board. The TPM can be connected via LPC or I2C
304 and a sandbox TPM is provided for testing purposes. Use the 'tpm'
305 command to interactive the TPM. Driver model support is provided
306 for the low-level TPM interface, but only one TPM is supported at
307 a time by the TPM library.
310 bool "Trusted Platform Module (TPM) Support in SPL"
313 This enables support for TPMs which can be used to provide security
314 features for your board. The TPM can be connected via LPC or I2C
315 and a sandbox TPM is provided for testing purposes. Use the 'tpm'
316 command to interactive the TPM. Driver model support is provided
317 for the low-level TPM interface, but only one TPM is supported at
318 a time by the TPM library.
321 bool "Trusted Platform Module (TPM) Support in TPL"
324 This enables support for TPMs which can be used to provide security
325 features for your board. The TPM can be connected via LPC or I2C
326 and a sandbox TPM is provided for testing purposes. Use the 'tpm'
327 command to interactive the TPM. Driver model support is provided
328 for the low-level TPM interface, but only one TPM is supported at
329 a time by the TPM library.
333 menu "Android Verified Boot"
336 bool "Android Verified Boot 2.0 support"
337 depends on ANDROID_BOOT_IMAGE
340 This enables support of Android Verified Boot 2.0 which can be used
341 to assure the end user of the integrity of the software running on a
342 device. Introduces such features as boot chain of trust, rollback
347 menu "Hashing Support"
350 bool "Enable SHA1 support"
352 This option enables support of hashing using SHA1 algorithm.
353 The hash is calculated in software.
354 The SHA1 algorithm produces a 160-bit (20-byte) hash value
358 bool "Enable SHA256 support"
360 This option enables support of hashing using SHA256 algorithm.
361 The hash is calculated in software.
362 The SHA256 algorithm produces a 256-bit (32-byte) hash value
366 bool "Enable SHA512 algorithm"
368 This option enables support of internal SHA512 algorithm.
371 bool "Enable SHA512 support"
372 depends on SHA512_ALGO
374 This option enables support of hashing using SHA512 algorithm.
375 The hash is calculated in software.
376 The SHA512 algorithm produces a 512-bit (64-byte) hash value
380 bool "Enable SHA384 support"
381 depends on SHA512_ALGO
383 This option enables support of hashing using SHA384 algorithm.
384 The hash is calculated in software.
385 The SHA384 algorithm produces a 384-bit (48-byte) hash value
389 bool "Enable hashing using hardware"
391 This option enables hardware acceleration
392 for SHA1/SHA256 hashing.
393 This affects the 'hash' command and also the
394 hash_lookup_algo() function.
396 config SHA_PROG_HW_ACCEL
397 bool "Enable Progressive hashing support using hardware"
398 depends on SHA_HW_ACCEL
400 This option enables hardware-acceleration for
401 SHA1/SHA256 progressive hashing.
402 Data can be streamed in a block at a time and the hashing
403 is performed in hardware.
406 bool "Support MD5 algorithm"
408 This option enables MD5 support. MD5 is an algorithm designed
409 in 1991 that produces a 16-byte digest (or checksum) from its input
410 data. It has a number of vulnerabilities which preclude its use in
411 security applications, but it can be useful for providing a quick
412 checksum of a block of data.
415 bool "Support MD5 algorithm in SPL"
417 This option enables MD5 support in SPL. MD5 is an algorithm designed
418 in 1991 that produces a 16-byte digest (or checksum) from its input
419 data. It has a number of vulnerabilities which preclude its use in
420 security applications, but it can be useful for providing a quick
421 checksum of a block of data.
431 menu "Compression Support"
434 bool "Enable LZ4 decompression support"
436 If this option is set, support for LZ4 compressed images
437 is included. The LZ4 algorithm can run in-place as long as the
438 compressed image is loaded to the end of the output buffer, and
439 trades lower compression ratios for much faster decompression.
441 NOTE: This implements the release version of the LZ4 frame
442 format as generated by default by the 'lz4' command line tool.
443 This is not the same as the outdated, less efficient legacy
444 frame format currently (2015) implemented in the Linux kernel
445 (generated by 'lz4 -l'). The two formats are incompatible.
448 bool "Enable LZMA decompression support"
450 This enables support for LZMA (Lempel-Ziv-Markov chain algorithm),
451 a dictionary compression algorithm that provides a high compression
452 ratio and fairly fast decompression speed. See also
453 CONFIG_CMD_LZMADEC which provides a decode command.
456 bool "Enable LZO decompression support"
458 This enables support for LZO compression algorithm.r
461 bool "Enable gzip decompression support"
465 This enables support for GZIP compression algorithm.
467 config ZLIB_UNCOMPRESS
468 bool "Enables zlib's uncompress() functionality"
470 This enables an extra zlib functionality: the uncompress() function,
471 which decompresses data from a buffer into another, knowing their
472 sizes. Unlike gunzip(), there is no header parsing.
474 config GZIP_COMPRESSED
479 bool "Enable bzip2 decompression support"
481 This enables support for BZIP2 compression algorithm.
487 This enables ZLIB compression lib.
490 bool "Enable Zstandard decompression support"
493 This enables Zstandard decompression library.
496 bool "Enable LZ4 decompression support in SPL"
498 This enables support for the LZ4 decompression algorithm in SPL. LZ4
499 is a lossless data compression algorithm that is focused on
500 fast compression and decompression speed. It belongs to the LZ77
501 family of byte-oriented compression schemes.
504 bool "Enable LZMA decompression support for SPL build"
506 This enables support for LZMA compression algorithm for SPL boot.
509 bool "Enable LZO decompression support in SPL"
511 This enables support for LZO compression algorithm in the SPL.
514 bool "Enable gzip decompression support for SPL build"
517 This enables support for GZIP compression altorithm for SPL boot.
522 This enables compression lib for SPL boot.
525 bool "Enable Zstandard decompression support in SPL"
528 This enables Zstandard decompression library in the SPL.
533 bool "Enable function for getting errno-related string message"
535 The function errno_str(int errno), returns a pointer to the errno
536 corresponding text message:
537 - if errno is null or positive number - a pointer to "Success" message
538 - if errno is negative - a pointer to errno related message
541 bool "Enable hexdump"
543 This enables functions for printing dumps of binary data.
546 bool "Enable hexdump in SPL"
550 This enables functions for printing dumps of binary data in
556 This enables functions for parsing command-line options.
559 bool "Enable the FDT library"
560 default y if OF_CONTROL
562 This enables the FDT library (libfdt). It provides functions for
563 accessing binary device tree images in memory, such as adding and
564 removing nodes and properties, scanning through the tree and finding
565 particular compatible nodes. The library operates on a flattened
566 version of the device tree.
568 config OF_LIBFDT_ASSUME_MASK
569 hex "Mask of conditions to assume for libfdt"
570 depends on OF_LIBFDT || FIT
573 Use this to change the assumptions made by libfdt about the
574 device tree it is working with. A value of 0 means that no assumptions
575 are made, and libfdt is able to deal with malicious data. A value of
576 0xff means all assumptions are made and any invalid data may cause
577 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
579 config OF_LIBFDT_OVERLAY
580 bool "Enable the FDT library overlay support"
582 default y if ARCH_OMAP2PLUS || ARCH_KEYSTONE
584 This enables the FDT library (libfdt) overlay support.
587 bool "Enable the FDT library for SPL"
588 default y if SPL_OF_CONTROL
590 This enables the FDT library (libfdt). It provides functions for
591 accessing binary device tree images in memory, such as adding and
592 removing nodes and properties, scanning through the tree and finding
593 particular compatible nodes. The library operates on a flattened
594 version of the device tree.
596 config SPL_OF_LIBFDT_ASSUME_MASK
597 hex "Mask of conditions to assume for libfdt"
598 depends on SPL_OF_LIBFDT || FIT
601 Use this to change the assumptions made by libfdt in SPL about the
602 device tree it is working with. A value of 0 means that no assumptions
603 are made, and libfdt is able to deal with malicious data. A value of
604 0xff means all assumptions are made and any invalid data may cause
605 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
608 bool "Enable the FDT library for TPL"
609 default y if TPL_OF_CONTROL
611 This enables the FDT library (libfdt). It provides functions for
612 accessing binary device tree images in memory, such as adding and
613 removing nodes and properties, scanning through the tree and finding
614 particular compatible nodes. The library operates on a flattened
615 version of the device tree.
617 config TPL_OF_LIBFDT_ASSUME_MASK
618 hex "Mask of conditions to assume for libfdt"
619 depends on TPL_OF_LIBFDT || FIT
622 Use this to change the assumptions made by libfdt in TPL about the
623 device tree it is working with. A value of 0 means that no assumptions
624 are made, and libfdt is able to deal with malicious data. A value of
625 0xff means all assumptions are made and any invalid data may cause
626 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
628 config FDT_FIXUP_PARTITIONS
629 bool "overwrite MTD partitions in DTS through defined in 'mtdparts'"
631 depends on CMD_MTDPARTS
633 Allow overwriting defined partitions in the device tree blob
634 using partition info defined in the 'mtdparts' environment
638 depends on (!EFI && !SYS_COREBOOT) || (ARM && EFI_LOADER)
640 config BLOBLIST_TABLES
641 bool "Put tables in a bloblist"
644 Normally tables are placed at address 0xf0000 and can be up to 64KB
645 long. With this option, tables are instead placed in the bloblist
646 with a pointer from 0xf0000. The size can then be larger and the
647 tables can be placed high in memory.
649 config GENERATE_SMBIOS_TABLE
650 bool "Generate an SMBIOS (System Management BIOS) table"
652 depends on X86 || EFI_LOADER
654 The System Management BIOS (SMBIOS) specification addresses how
655 motherboard and system vendors present management information about
656 their products in a standard format by extending the BIOS interface
657 on Intel architecture systems.
659 Check http://www.dmtf.org/standards/smbios for details.
661 See also SMBIOS_SYSINFO which allows SMBIOS values to be provided in
672 Enable asn1 decoder library.
677 Enable fast lookup object identifier registry.
682 A simple parser for SMBIOS data.
684 source lib/efi/Kconfig
685 source lib/efi_loader/Kconfig
686 source lib/optee/Kconfig
689 bool "enable fdtdec test"
698 Support basic elf loading/validating functions.
699 This supports for 32 bit and 64 bit versions.
703 config PHANDLE_CHECK_SEQ
704 bool "Enable phandle check while getting sequence number"
707 When there are multiple device tree nodes with same name,
708 enable this config option to distinguish them using
709 phandles in fdtdec_get_alias_seq() function.