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
28 default y if OF_SEPARATE || OF_EMBED
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 hardware acceleration for SHA hash functions"
394 This option enables hardware acceleration for the SHA1 and SHA256
395 hashing algorithms. This affects the 'hash' command and also the
396 hash_lookup_algo() function.
400 config SHA512_HW_ACCEL
401 bool "Enable hardware acceleration for SHA512"
402 depends on SHA512_ALGO
404 This option enables hardware acceleration for the SHA384 and SHA512
405 hashing algorithms. This affects the 'hash' command and also the
406 hash_lookup_algo() function.
408 config SHA_PROG_HW_ACCEL
409 bool "Enable Progressive hashing support using hardware"
411 This option enables hardware-acceleration for SHA progressive
413 Data can be streamed in a block at a time and the hashing is
414 performed in hardware.
419 bool "Support MD5 algorithm"
421 This option enables MD5 support. MD5 is an algorithm designed
422 in 1991 that produces a 16-byte digest (or checksum) from its input
423 data. It has a number of vulnerabilities which preclude its use in
424 security applications, but it can be useful for providing a quick
425 checksum of a block of data.
428 bool "Support MD5 algorithm in SPL"
430 This option enables MD5 support in SPL. MD5 is an algorithm designed
431 in 1991 that produces a 16-byte digest (or checksum) from its input
432 data. It has a number of vulnerabilities which preclude its use in
433 security applications, but it can be useful for providing a quick
434 checksum of a block of data.
442 config HASH_CALCULATE
447 menu "Compression Support"
450 bool "Enable LZ4 decompression support"
452 If this option is set, support for LZ4 compressed images
453 is included. The LZ4 algorithm can run in-place as long as the
454 compressed image is loaded to the end of the output buffer, and
455 trades lower compression ratios for much faster decompression.
457 NOTE: This implements the release version of the LZ4 frame
458 format as generated by default by the 'lz4' command line tool.
459 This is not the same as the outdated, less efficient legacy
460 frame format currently (2015) implemented in the Linux kernel
461 (generated by 'lz4 -l'). The two formats are incompatible.
464 bool "Enable LZMA decompression support"
466 This enables support for LZMA (Lempel-Ziv-Markov chain algorithm),
467 a dictionary compression algorithm that provides a high compression
468 ratio and fairly fast decompression speed. See also
469 CONFIG_CMD_LZMADEC which provides a decode command.
472 bool "Enable LZO decompression support"
474 This enables support for LZO compression algorithm.r
477 bool "Enable gzip decompression support"
481 This enables support for GZIP compression algorithm.
483 config ZLIB_UNCOMPRESS
484 bool "Enables zlib's uncompress() functionality"
486 This enables an extra zlib functionality: the uncompress() function,
487 which decompresses data from a buffer into another, knowing their
488 sizes. Unlike gunzip(), there is no header parsing.
490 config GZIP_COMPRESSED
495 bool "Enable bzip2 decompression support"
497 This enables support for BZIP2 compression algorithm.
503 This enables ZLIB compression lib.
506 bool "Enable Zstandard decompression support"
509 This enables Zstandard decompression library.
512 bool "Enable LZ4 decompression support in SPL"
514 This enables support for the LZ4 decompression algorithm in SPL. LZ4
515 is a lossless data compression algorithm that is focused on
516 fast compression and decompression speed. It belongs to the LZ77
517 family of byte-oriented compression schemes.
520 bool "Enable LZMA decompression support for SPL build"
522 This enables support for LZMA compression algorithm for SPL boot.
525 bool "Enable LZO decompression support in SPL"
527 This enables support for LZO compression algorithm in the SPL.
530 bool "Enable gzip decompression support for SPL build"
533 This enables support for GZIP compression altorithm for SPL boot.
538 This enables compression lib for SPL boot.
541 bool "Enable Zstandard decompression support in SPL"
544 This enables Zstandard decompression library in the SPL.
549 bool "Enable function for getting errno-related string message"
551 The function errno_str(int errno), returns a pointer to the errno
552 corresponding text message:
553 - if errno is null or positive number - a pointer to "Success" message
554 - if errno is negative - a pointer to errno related message
557 bool "Enable hexdump"
559 This enables functions for printing dumps of binary data.
562 bool "Enable hexdump in SPL"
566 This enables functions for printing dumps of binary data in
572 This enables functions for parsing command-line options.
575 bool "Enable the FDT library"
576 default y if OF_CONTROL
578 This enables the FDT library (libfdt). It provides functions for
579 accessing binary device tree images in memory, such as adding and
580 removing nodes and properties, scanning through the tree and finding
581 particular compatible nodes. The library operates on a flattened
582 version of the device tree.
584 config OF_LIBFDT_ASSUME_MASK
585 hex "Mask of conditions to assume for libfdt"
586 depends on OF_LIBFDT || FIT
589 Use this to change the assumptions made by libfdt about the
590 device tree it is working with. A value of 0 means that no assumptions
591 are made, and libfdt is able to deal with malicious data. A value of
592 0xff means all assumptions are made and any invalid data may cause
593 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
595 config OF_LIBFDT_OVERLAY
596 bool "Enable the FDT library overlay support"
598 default y if ARCH_OMAP2PLUS || ARCH_KEYSTONE
600 This enables the FDT library (libfdt) overlay support.
603 bool "Enable the FDT library for SPL"
604 default y if SPL_OF_CONTROL
606 This enables the FDT library (libfdt). It provides functions for
607 accessing binary device tree images in memory, such as adding and
608 removing nodes and properties, scanning through the tree and finding
609 particular compatible nodes. The library operates on a flattened
610 version of the device tree.
612 config SPL_OF_LIBFDT_ASSUME_MASK
613 hex "Mask of conditions to assume for libfdt"
614 depends on SPL_OF_LIBFDT || FIT
617 Use this to change the assumptions made by libfdt in SPL about the
618 device tree it is working with. A value of 0 means that no assumptions
619 are made, and libfdt is able to deal with malicious data. A value of
620 0xff means all assumptions are made and any invalid data may cause
621 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
624 bool "Enable the FDT library for TPL"
625 default y if TPL_OF_CONTROL
627 This enables the FDT library (libfdt). It provides functions for
628 accessing binary device tree images in memory, such as adding and
629 removing nodes and properties, scanning through the tree and finding
630 particular compatible nodes. The library operates on a flattened
631 version of the device tree.
633 config TPL_OF_LIBFDT_ASSUME_MASK
634 hex "Mask of conditions to assume for libfdt"
635 depends on TPL_OF_LIBFDT || FIT
638 Use this to change the assumptions made by libfdt in TPL about the
639 device tree it is working with. A value of 0 means that no assumptions
640 are made, and libfdt is able to deal with malicious data. A value of
641 0xff means all assumptions are made and any invalid data may cause
642 unsafe execution. See FDT_ASSUME_PERFECT, etc. in libfdt_internal.h
644 config FDT_FIXUP_PARTITIONS
645 bool "overwrite MTD partitions in DTS through defined in 'mtdparts'"
647 depends on CMD_MTDPARTS
649 Allow overwriting defined partitions in the device tree blob
650 using partition info defined in the 'mtdparts' environment
654 depends on (!EFI && !SYS_COREBOOT) || (ARM && EFI_LOADER)
656 config BLOBLIST_TABLES
657 bool "Put tables in a bloblist"
658 depends on X86 && BLOBLIST
660 Normally tables are placed at address 0xf0000 and can be up to 64KB
661 long. With this option, tables are instead placed in the bloblist
662 with a pointer from 0xf0000. The size can then be larger and the
663 tables can be placed high in memory.
665 config GENERATE_SMBIOS_TABLE
666 bool "Generate an SMBIOS (System Management BIOS) table"
668 depends on X86 || EFI_LOADER
670 The System Management BIOS (SMBIOS) specification addresses how
671 motherboard and system vendors present management information about
672 their products in a standard format by extending the BIOS interface
673 on Intel architecture systems.
675 Check http://www.dmtf.org/standards/smbios for details.
677 See also SMBIOS_SYSINFO which allows SMBIOS values to be provided in
688 Enable asn1 decoder library.
693 Enable fast lookup object identifier registry.
698 A simple parser for SMBIOS data.
700 source lib/efi/Kconfig
701 source lib/efi_loader/Kconfig
702 source lib/optee/Kconfig
705 bool "enable fdtdec test"
714 Support basic elf loading/validating functions.
715 This supports for 32 bit and 64 bit versions.
718 bool "Enable the logical memory blocks library (lmb)"
719 default y if ARC || ARM || M68K || MICROBLAZE || MIPS || NDS32 || \
720 NIOS2 || PPC || RISCV || SANDBOX || SH || X86 || XTENSA
722 Support the library logical memory blocks.
724 config LMB_USE_MAX_REGIONS
725 bool "Use a commun number of memory and reserved regions in lmb lib"
729 Define the number of supported memory regions in the library logical
731 This feature allow to reduce the lmb library size by using compiler
732 optimization when LMB_MEMORY_REGIONS == LMB_RESERVED_REGIONS.
734 config LMB_MAX_REGIONS
735 int "Number of memory and reserved regions in lmb lib"
736 depends on LMB && LMB_USE_MAX_REGIONS
739 Define the number of supported regions, memory and reserved, in the
740 library logical memory blocks.
742 config LMB_MEMORY_REGIONS
743 int "Number of memory regions in lmb lib"
744 depends on LMB && !LMB_USE_MAX_REGIONS
747 Define the number of supported memory regions in the library logical
749 The minimal value is CONFIG_NR_DRAM_BANKS.
751 config LMB_RESERVED_REGIONS
752 int "Number of reserved regions in lmb lib"
753 depends on LMB && !LMB_USE_MAX_REGIONS
756 Define the number of supported reserved regions in the library logical
761 config PHANDLE_CHECK_SEQ
762 bool "Enable phandle check while getting sequence number"
765 When there are multiple device tree nodes with same name,
766 enable this config option to distinguish them using
767 phandles in fdtdec_get_alias_seq() function.