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 This library only works in the post-relocation phase.
11 config SYS_NUM_ADDR_MAP
12 int "Size of the address-map table"
16 Sets the number of entries in the virtual-physical mapping table.
19 bool "Enable Software based BCH ECC"
21 Enables software based BCH ECC algorithm present in lib/bch.c
22 This is used by SoC platforms which do not have built-in ELM
23 hardware engine required for BCH ECC correction.
26 bool "Allow access to binman information in the device tree"
27 depends on BINMAN && DM && OF_CONTROL
30 This enables U-Boot to access information about binman entries,
31 stored in the device tree in a binman node. Typical uses are to
32 locate entries in the firmware image. See binman.h for the available
35 config CC_OPTIMIZE_LIBS_FOR_SPEED
36 bool "Optimize libraries for speed"
38 Enabling this option will pass "-O2" to gcc when compiling
39 under "lib" directory.
43 config DYNAMIC_CRC_TABLE
44 bool "Enable Dynamic tables for CRC"
46 Enable this option to calculate entries for CRC tables at runtime.
47 This can be helpful when reducing the size of the build image
49 config HAVE_ARCH_IOMAP
52 Enable this option if architecture provides io{read,write}{8,16,32}
53 I/O accessor functions.
55 config HAVE_PRIVATE_LIBGCC
68 select SPL_STRTO if !SPL_USE_TINY_PRINTF
73 select TPL_STRTO if !TPL_USE_TINY_PRINTF
102 config IMAGE_SPARSE_FILLBUF_SIZE
103 hex "Android sparse image CHUNK_TYPE_FILL buffer size"
105 depends on IMAGE_SPARSE
107 Set the size of the fill buffer used when processing CHUNK_TYPE_FILL
110 config USE_PRIVATE_LIBGCC
111 bool "Use private libgcc"
112 depends on HAVE_PRIVATE_LIBGCC
113 default y if HAVE_PRIVATE_LIBGCC && ((ARM && !ARM64) || MIPS)
115 This option allows you to use the built-in libgcc implementation
116 of U-Boot instead of the one provided by the compiler.
123 The frequency of the timer returned by get_timer().
124 get_timer() must operate in milliseconds and this option must be
127 config SPL_USE_TINY_PRINTF
128 bool "Enable tiny printf() version in SPL"
132 This option enables a tiny, stripped down printf version.
133 This should only be used in space limited environments,
134 like SPL versions with hard memory limits. This version
135 reduces the code size by about 2.5KiB on armv7.
137 The supported format specifiers are %c, %s, %u/%d and %x.
139 config TPL_USE_TINY_PRINTF
140 bool "Enable tiny printf() version in TPL"
142 default y if SPL_USE_TINY_PRINTF
144 This option enables a tiny, stripped down printf version.
145 This should only be used in space limited environments,
146 like SPL versions with hard memory limits. This version
147 reduces the code size by about 2.5KiB on armv7.
149 The supported format specifiers are %c, %s, %u/%d and %x.
152 bool "Do not reset the system on fatal error"
154 Define this option to stop the system in case of a fatal error,
155 so that you have to reset it manually. This is probably NOT a good
156 idea for an embedded system where you want the system to reboot
157 automatically as fast as possible, but it may be useful during
158 development since you can try to debug the conditions that lead to
162 bool "Enable regular expression support"
165 If this variable is defined, U-Boot is linked against the
166 SLRE (Super Light Regular Expression) library, which adds
167 regex support to some commands, for example "env grep" and
171 prompt "Pseudo-random library support type"
172 depends on NET_RANDOM_ETHADDR || RANDOM_UUID || CMD_UUID || \
173 RNG_SANDBOX || UT_LIB && AES || FAT_WRITE
176 Select the library to provide pseudo-random number generator
177 functions. LIB_HW_RAND supports certain hardware engines that
178 provide this functionality. If in doubt, select LIB_RAND.
181 bool "Pseudo-random library support"
184 bool "HW Engine for random library support"
188 config SPL_TINY_MEMSET
189 bool "Use a very small memset() in SPL"
191 The faster memset() is the arch-specific one (if available) enabled
192 by CONFIG_USE_ARCH_MEMSET. If that is not enabled, we can still get
193 better performance by writing a word at a time. But in very
194 size-constrained environments even this may be too big. Enable this
195 option to reduce code size slightly at the cost of some speed.
197 config TPL_TINY_MEMSET
198 bool "Use a very small memset() in TPL"
200 The faster memset() is the arch-specific one (if available) enabled
201 by CONFIG_USE_ARCH_MEMSET. If that is not enabled, we can still get
202 better performance by writing a word at a time. But in very
203 size-constrained environments even this may be too big. Enable this
204 option to reduce code size slightly at the cost of some speed.
210 bool "Bit reverse library from Linux"
213 bool "Support for tracing of function calls and timing"
217 Enables function tracing within U-Boot. This allows recording of call
218 traces including timing information. The command can write data to
219 memory for exporting for analysis (e.g. using bootchart).
220 See doc/README.trace for full details.
222 config TRACE_BUFFER_SIZE
223 hex "Size of trace buffer in U-Boot"
227 Sets the size of the trace buffer in U-Boot. This is allocated from
228 memory during relocation. If this buffer is too small, the trace
229 history will be truncated, with later records omitted.
231 If early trace is enabled (i.e. before relocation), this buffer must
232 be large enough to include all the data from the early trace buffer as
233 well, since this is copied over to the main buffer during relocation.
235 A trace record is emitted for each function call and each record is
236 12 bytes (see struct trace_call). A suggested minimum size is 1MB. If
237 the size is too small then 'trace stats' will show a message saying
238 how many records were dropped due to buffer overflow.
240 config TRACE_CALL_DEPTH_LIMIT
241 int "Trace call depth limit"
245 Sets the maximum call depth up to which function calls are recorded.
248 bool "Enable tracing before relocation"
251 Sometimes it is helpful to trace execution of U-Boot before
252 relocation. This is possible by using a arch-specific, fixed buffer
253 position in memory. Enable this option to start tracing as early as
254 possible after U-Boot starts.
256 config TRACE_EARLY_SIZE
257 hex "Size of early trace buffer in U-Boot"
258 depends on TRACE_EARLY
261 Sets the size of the early trace buffer in bytes. This is used to hold
262 tracing information before relocation.
264 config TRACE_EARLY_CALL_DEPTH_LIMIT
265 int "Early trace call depth limit"
266 depends on TRACE_EARLY
269 Sets the maximum call depth up to which function calls are recorded
270 during early tracing.
272 config TRACE_EARLY_ADDR
273 hex "Address of early trace buffer in U-Boot"
274 depends on TRACE_EARLY
277 Sets the address of the early trace buffer in U-Boot. This memory
278 must be accessible before relocation.
280 A trace record is emitted for each function call and each record is
281 12 bytes (see struct trace_call). A suggested minimum size is 1MB. If
282 the size is too small then the message which says the amount of early
283 data being coped will the the same as the
285 source lib/dhry/Kconfig
287 menu "Security support"
290 bool "Support the AES algorithm"
292 This provides a means to encrypt and decrypt data using the AES
293 (Advanced Encryption Standard). This algorithm uses a symetric key
294 and is widely used as a streaming cipher. Different key lengths are
295 supported by the algorithm but only a 128-bit key is supported at
298 source lib/rsa/Kconfig
299 source lib/crypto/Kconfig
302 bool "Trusted Platform Module (TPM) Support"
305 This enables support for TPMs which can be used to provide security
306 features for your board. The TPM can be connected via LPC or I2C
307 and a sandbox TPM is provided for testing purposes. Use the 'tpm'
308 command to interactive the TPM. Driver model support is provided
309 for the low-level TPM interface, but only one TPM is supported at
310 a time by the TPM library.
313 bool "Trusted Platform Module (TPM) Support in SPL"
316 This enables support for TPMs which can be used to provide security
317 features for your board. The TPM can be connected via LPC or I2C
318 and a sandbox TPM is provided for testing purposes. Use the 'tpm'
319 command to interactive the TPM. Driver model support is provided
320 for the low-level TPM interface, but only one TPM is supported at
321 a time by the TPM library.
324 bool "Trusted Platform Module (TPM) Support in TPL"
327 This enables support for TPMs which can be used to provide security
328 features for your board. The TPM can be connected via LPC or I2C
329 and a sandbox TPM is provided for testing purposes. Use the 'tpm'
330 command to interactive the TPM. Driver model support is provided
331 for the low-level TPM interface, but only one TPM is supported at
332 a time by the TPM library.
336 menu "Android Verified Boot"
339 bool "Android Verified Boot 2.0 support"
340 depends on ANDROID_BOOT_IMAGE
343 This enables support of Android Verified Boot 2.0 which can be used
344 to assure the end user of the integrity of the software running on a
345 device. Introduces such features as boot chain of trust, rollback
350 menu "Hashing Support"
353 bool "Enable SHA1 support"
355 This option enables support of hashing using SHA1 algorithm.
356 The hash is calculated in software.
357 The SHA1 algorithm produces a 160-bit (20-byte) hash value
361 bool "Enable SHA256 support"
363 This option enables support of hashing using SHA256 algorithm.
364 The hash is calculated in software.
365 The SHA256 algorithm produces a 256-bit (32-byte) hash value
369 bool "Enable SHA512 algorithm"
371 This option enables support of internal SHA512 algorithm.
374 bool "Enable SHA512 support"
375 depends on SHA512_ALGO
377 This option enables support of hashing using SHA512 algorithm.
378 The hash is calculated in software.
379 The SHA512 algorithm produces a 512-bit (64-byte) hash value
383 bool "Enable SHA384 support"
384 depends on SHA512_ALGO
386 This option enables support of hashing using SHA384 algorithm.
387 The hash is calculated in software.
388 The SHA384 algorithm produces a 384-bit (48-byte) hash value
392 bool "Enable hashing using hardware"
394 This option enables hardware acceleration for SHA hashing.
395 This affects the 'hash' command and also the hash_lookup_algo()
398 config SHA_PROG_HW_ACCEL
399 bool "Enable Progressive hashing support using hardware"
400 depends on SHA_HW_ACCEL
402 This option enables hardware-acceleration for SHA progressive
404 Data can be streamed in a block at a time and the hashing is
405 performed in hardware.
408 bool "Support MD5 algorithm"
410 This option enables MD5 support. MD5 is an algorithm designed
411 in 1991 that produces a 16-byte digest (or checksum) from its input
412 data. It has a number of vulnerabilities which preclude its use in
413 security applications, but it can be useful for providing a quick
414 checksum of a block of data.
417 bool "Support MD5 algorithm in SPL"
419 This option enables MD5 support in SPL. MD5 is an algorithm designed
420 in 1991 that produces a 16-byte digest (or checksum) from its input
421 data. It has a number of vulnerabilities which preclude its use in
422 security applications, but it can be useful for providing a quick
423 checksum of a block of data.
433 menu "Compression Support"
436 bool "Enable LZ4 decompression support"
438 If this option is set, support for LZ4 compressed images
439 is included. The LZ4 algorithm can run in-place as long as the
440 compressed image is loaded to the end of the output buffer, and
441 trades lower compression ratios for much faster decompression.
443 NOTE: This implements the release version of the LZ4 frame
444 format as generated by default by the 'lz4' command line tool.
445 This is not the same as the outdated, less efficient legacy
446 frame format currently (2015) implemented in the Linux kernel
447 (generated by 'lz4 -l'). The two formats are incompatible.
450 bool "Enable LZMA decompression support"
452 This enables support for LZMA (Lempel-Ziv-Markov chain algorithm),
453 a dictionary compression algorithm that provides a high compression
454 ratio and fairly fast decompression speed. See also
455 CONFIG_CMD_LZMADEC which provides a decode command.
458 bool "Enable LZO decompression support"
460 This enables support for LZO compression algorithm.r
463 bool "Enable gzip decompression support"
467 This enables support for GZIP compression algorithm.
469 config ZLIB_UNCOMPRESS
470 bool "Enables zlib's uncompress() functionality"
472 This enables an extra zlib functionality: the uncompress() function,
473 which decompresses data from a buffer into another, knowing their
474 sizes. Unlike gunzip(), there is no header parsing.
476 config GZIP_COMPRESSED
481 bool "Enable bzip2 decompression support"
483 This enables support for BZIP2 compression algorithm.
489 This enables ZLIB compression lib.
492 bool "Enable Zstandard decompression support"
495 This enables Zstandard decompression library.
498 bool "Enable LZ4 decompression support in SPL"
500 This enables support for the LZ4 decompression algorithm in SPL. LZ4
501 is a lossless data compression algorithm that is focused on
502 fast compression and decompression speed. It belongs to the LZ77
503 family of byte-oriented compression schemes.
506 bool "Enable LZMA decompression support for SPL build"
508 This enables support for LZMA compression algorithm for SPL boot.
511 bool "Enable LZO decompression support in SPL"
513 This enables support for LZO compression algorithm in the SPL.
516 bool "Enable gzip decompression support for SPL build"
519 This enables support for GZIP compression altorithm for SPL boot.
524 This enables compression lib for SPL boot.
527 bool "Enable Zstandard decompression support in SPL"
530 This enables Zstandard decompression library in the SPL.
535 bool "Enable function for getting errno-related string message"
537 The function errno_str(int errno), returns a pointer to the errno
538 corresponding text message:
539 - if errno is null or positive number - a pointer to "Success" message
540 - if errno is negative - a pointer to errno related message
543 bool "Enable hexdump"
545 This enables functions for printing dumps of binary data.
548 bool "Enable hexdump in SPL"
552 This enables functions for printing dumps of binary data in
558 This enables functions for parsing command-line options.
561 bool "Enable the FDT library"
562 default y if OF_CONTROL
564 This enables the FDT library (libfdt). It provides functions for
565 accessing binary device tree images in memory, such as adding and
566 removing nodes and properties, scanning through the tree and finding
567 particular compatible nodes. The library operates on a flattened
568 version of the device tree.
570 config OF_LIBFDT_ASSUME_MASK
571 hex "Mask of conditions to assume for libfdt"
572 depends on OF_LIBFDT || FIT
575 Use this to change the assumptions made by libfdt about the
576 device tree it is working with. A value of 0 means that no assumptions
577 are made, and libfdt is able to deal with malicious data. A value of
578 0xff means all assumptions are made and any invalid data may cause
579 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
581 config OF_LIBFDT_OVERLAY
582 bool "Enable the FDT library overlay support"
584 default y if ARCH_OMAP2PLUS || ARCH_KEYSTONE
586 This enables the FDT library (libfdt) overlay support.
589 bool "Enable the FDT library for SPL"
590 default y if SPL_OF_CONTROL
592 This enables the FDT library (libfdt). It provides functions for
593 accessing binary device tree images in memory, such as adding and
594 removing nodes and properties, scanning through the tree and finding
595 particular compatible nodes. The library operates on a flattened
596 version of the device tree.
598 config SPL_OF_LIBFDT_ASSUME_MASK
599 hex "Mask of conditions to assume for libfdt"
600 depends on SPL_OF_LIBFDT || FIT
603 Use this to change the assumptions made by libfdt in SPL about the
604 device tree it is working with. A value of 0 means that no assumptions
605 are made, and libfdt is able to deal with malicious data. A value of
606 0xff means all assumptions are made and any invalid data may cause
607 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
610 bool "Enable the FDT library for TPL"
611 default y if TPL_OF_CONTROL
613 This enables the FDT library (libfdt). It provides functions for
614 accessing binary device tree images in memory, such as adding and
615 removing nodes and properties, scanning through the tree and finding
616 particular compatible nodes. The library operates on a flattened
617 version of the device tree.
619 config TPL_OF_LIBFDT_ASSUME_MASK
620 hex "Mask of conditions to assume for libfdt"
621 depends on TPL_OF_LIBFDT || FIT
624 Use this to change the assumptions made by libfdt in TPL about the
625 device tree it is working with. A value of 0 means that no assumptions
626 are made, and libfdt is able to deal with malicious data. A value of
627 0xff means all assumptions are made and any invalid data may cause
628 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
630 config FDT_FIXUP_PARTITIONS
631 bool "overwrite MTD partitions in DTS through defined in 'mtdparts'"
633 depends on CMD_MTDPARTS
635 Allow overwriting defined partitions in the device tree blob
636 using partition info defined in the 'mtdparts' environment
640 depends on (!EFI && !SYS_COREBOOT) || (ARM && EFI_LOADER)
642 config BLOBLIST_TABLES
643 bool "Put tables in a bloblist"
644 depends on X86 && BLOBLIST
646 Normally tables are placed at address 0xf0000 and can be up to 64KB
647 long. With this option, tables are instead placed in the bloblist
648 with a pointer from 0xf0000. The size can then be larger and the
649 tables can be placed high in memory.
651 config GENERATE_SMBIOS_TABLE
652 bool "Generate an SMBIOS (System Management BIOS) table"
654 depends on X86 || EFI_LOADER
656 The System Management BIOS (SMBIOS) specification addresses how
657 motherboard and system vendors present management information about
658 their products in a standard format by extending the BIOS interface
659 on Intel architecture systems.
661 Check http://www.dmtf.org/standards/smbios for details.
663 See also SMBIOS_SYSINFO which allows SMBIOS values to be provided in
674 Enable asn1 decoder library.
679 Enable fast lookup object identifier registry.
684 A simple parser for SMBIOS data.
686 source lib/efi/Kconfig
687 source lib/efi_loader/Kconfig
688 source lib/optee/Kconfig
691 bool "enable fdtdec test"
700 Support basic elf loading/validating functions.
701 This supports for 32 bit and 64 bit versions.
704 bool "Enable the logical memory blocks library (lmb)"
705 default y if ARC || ARM || M68K || MICROBLAZE || MIPS || NDS32 || \
706 NIOS2 || PPC || RISCV || SANDBOX || SH || X86 || XTENSA
708 Support the library logical memory blocks.
712 config PHANDLE_CHECK_SEQ
713 bool "Enable phandle check while getting sequence number"
716 When there are multiple device tree nodes with same name,
717 enable this config option to distinguish them using
718 phandles in fdtdec_get_alias_seq() function.