u-boot/lib/Kconfig

menu "Library routines"

config BCH
	bool "Enable Software based BCH ECC"
	help
	  Enables software based BCH ECC algorithm present in lib/bch.c
	  This is used by SoC platforms which do not have built-in ELM
	  hardware engine required for BCH ECC correction.

config CC_OPTIMIZE_LIBS_FOR_SPEED
	bool "Optimize libraries for speed"
	help
	  Enabling this option will pass "-O2" to gcc when compiling
	  under "lib" directory.

	  If unsure, say N.

config DYNAMIC_CRC_TABLE
	bool "Enable Dynamic tables for CRC"
	help
	  Enable this option to calculate entries for CRC tables at runtime.
	  This can be helpful when reducing the size of the build image

config HAVE_ARCH_IOMAP
	bool
	help
	  Enable this option if architecture provides io{read,write}{8,16,32}
	  I/O accessor functions.

config HAVE_PRIVATE_LIBGCC
	bool

config LIB_UUID
	bool

config PRINTF
	bool
	default y

config SPL_PRINTF
	bool
	select SPL_SPRINTF
	select SPL_STRTO if !USE_TINY_PRINTF

config TPL_PRINTF
	bool
	select TPL_SPRINTF
	select TPL_STRTO if !USE_TINY_PRINTF

config SPRINTF
	bool
	default y

config SPL_SPRINTF
	bool

config TPL_SPRINTF
	bool

config STRTO
	bool
	default y

config SPL_STRTO
	bool

config TPL_STRTO
	bool

config IMAGE_SPARSE
	bool

config IMAGE_SPARSE_FILLBUF_SIZE
	hex "Android sparse image CHUNK_TYPE_FILL buffer size"
	default 0x80000
	depends on IMAGE_SPARSE
	help
	  Set the size of the fill buffer used when processing CHUNK_TYPE_FILL
	  chunks.

config USE_PRIVATE_LIBGCC
	bool "Use private libgcc"
	depends on HAVE_PRIVATE_LIBGCC
	default y if HAVE_PRIVATE_LIBGCC && ((ARM && !ARM64) || MIPS)
	help
	  This option allows you to use the built-in libgcc implementation
	  of U-Boot instead of the one provided by the compiler.
	  If unsure, say N.

config SYS_HZ
	int
	default 1000
	help
	  The frequency of the timer returned by get_timer().
	  get_timer() must operate in milliseconds and this option must be
	  set to 1000.

config USE_TINY_PRINTF
	bool "Enable tiny printf() version"
	help
	  This option enables a tiny, stripped down printf version.
	  This should only be used in space limited environments,
	  like SPL versions with hard memory limits. This version
	  reduces the code size by about 2.5KiB on armv7.

	  The supported format specifiers are %c, %s, %u/%d and %x.

config PANIC_HANG
	bool "Do not reset the system on fatal error"
	help
	  Define this option to stop the system in case of a fatal error,
	  so that you have to reset it manually. This is probably NOT a good
	  idea for an embedded system where you want the system to reboot
	  automatically as fast as possible, but it may be useful during
	  development since you can try to debug the conditions that lead to
	  the situation.

config REGEX
	bool "Enable regular expression support"
	default y if NET
	help
	  If this variable is defined, U-Boot is linked against the
	  SLRE (Super Light Regular Expression) library, which adds
	  regex support to some commands, for example "env grep" and
	  "setexpr".

choice
	prompt "Pseudo-random library support type"
	depends on NET_RANDOM_ETHADDR || RANDOM_UUID || CMD_UUID
	default LIB_RAND
	help
	  Select the library to provide pseudo-random number generator
	  functions.  LIB_HW_RAND supports certain hardware engines that
	  provide this functionality.  If in doubt, select LIB_RAND.

config LIB_RAND
	bool "Pseudo-random library support"

config LIB_HW_RAND
	bool "HW Engine for random libray support"

endchoice

config SPL_TINY_MEMSET
	bool "Use a very small memset() in SPL"
	help
	  The faster memset() is the arch-specific one (if available) enabled
	  by CONFIG_USE_ARCH_MEMSET. If that is not enabled, we can still get
	  better performance by writing a word at a time. But in very
	  size-constrained envrionments even this may be too big. Enable this
	  option to reduce code size slightly at the cost of some speed.

config TPL_TINY_MEMSET
	bool "Use a very small memset() in TPL"
	help
	  The faster memset() is the arch-specific one (if available) enabled
	  by CONFIG_USE_ARCH_MEMSET. If that is not enabled, we can still get
	  better performance by writing a word at a time. But in very
	  size-constrained envrionments even this may be too big. Enable this
	  option to reduce code size slightly at the cost of some speed.

config RBTREE
	bool

config BITREVERSE
	bool "Bit reverse library from Linux"

source lib/dhry/Kconfig

menu "Security support"

config AES
	bool "Support the AES algorithm"
	help
	  This provides a means to encrypt and decrypt data using the AES
	  (Advanced Encryption Standard). This algorithm uses a symetric key
	  and is widely used as a streaming cipher. Different key lengths are
	  supported by the algorithm but only a 128-bit key is supported at
	  present.

source lib/rsa/Kconfig

config TPM
	bool "Trusted Platform Module (TPM) Support"
	depends on DM
	help
	  This enables support for TPMs which can be used to provide security
	  features for your board. The TPM can be connected via LPC or I2C
	  and a sandbox TPM is provided for testing purposes. Use the 'tpm'
	  command to interactive the TPM. Driver model support is provided
	  for the low-level TPM interface, but only one TPM is supported at
	  a time by the TPM library.

config SPL_TPM
	bool "Trusted Platform Module (TPM) Support in SPL"
	depends on SPL_DM
	help
	  This enables support for TPMs which can be used to provide security
	  features for your board. The TPM can be connected via LPC or I2C
	  and a sandbox TPM is provided for testing purposes. Use the 'tpm'
	  command to interactive the TPM. Driver model support is provided
	  for the low-level TPM interface, but only one TPM is supported at
	  a time by the TPM library.

config TPL_TPM
	bool "Trusted Platform Module (TPM) Support in TPL"
	depends on TPL_DM
	help
	  This enables support for TPMs which can be used to provide security
	  features for your board. The TPM can be connected via LPC or I2C
	  and a sandbox TPM is provided for testing purposes. Use the 'tpm'
	  command to interactive the TPM. Driver model support is provided
	  for the low-level TPM interface, but only one TPM is supported at
	  a time by the TPM library.

endmenu

menu "Android Verified Boot"

config LIBAVB
	bool "Android Verified Boot 2.0 support"
	depends on ANDROID_BOOT_IMAGE
	default n
	help
	  This enables support of Android Verified Boot 2.0 which can be used
	  to assure the end user of the integrity of the software running on a
	  device. Introduces such features as boot chain of trust, rollback
	  protection etc.

endmenu

menu "Hashing Support"

config SHA1
	bool "Enable SHA1 support"
	help
	  This option enables support of hashing using SHA1 algorithm.
	  The hash is calculated in software.
	  The SHA1 algorithm produces a 160-bit (20-byte) hash value
	  (digest).

config SHA256
	bool "Enable SHA256 support"
	help
	  This option enables support of hashing using SHA256 algorithm.
	  The hash is calculated in software.
	  The SHA256 algorithm produces a 256-bit (32-byte) hash value
	  (digest).

config SHA_HW_ACCEL
	bool "Enable hashing using hardware"
	help
	  This option enables hardware acceleration
	  for SHA1/SHA256 hashing.
	  This affects the 'hash' command and also the
	  hash_lookup_algo() function.

config SHA_PROG_HW_ACCEL
	bool "Enable Progressive hashing support using hardware"
	depends on SHA_HW_ACCEL
	help
	  This option enables hardware-acceleration for
	  SHA1/SHA256 progressive hashing.
	  Data can be streamed in a block at a time and the hashing
	  is performed in hardware.

config MD5
	bool

config CRC32C
	bool

endmenu

menu "Compression Support"

config LZ4
	bool "Enable LZ4 decompression support"
	help
	  If this option is set, support for LZ4 compressed images
	  is included. The LZ4 algorithm can run in-place as long as the
	  compressed image is loaded to the end of the output buffer, and
	  trades lower compression ratios for much faster decompression.
	  
	  NOTE: This implements the release version of the LZ4 frame
	  format as generated by default by the 'lz4' command line tool.
	  This is not the same as the outdated, less efficient legacy
	  frame format currently (2015) implemented in the Linux kernel
	  (generated by 'lz4 -l'). The two formats are incompatible.

config LZMA
	bool "Enable LZMA decompression support"
	help
	  This enables support for LZMA (Lempel-Ziv-Markov chain algorithm),
	  a dictionary compression algorithm that provides a high compression
	  ratio and fairly fast decompression speed. See also
	  CONFIG_CMD_LZMADEC which provides a decode command.

config LZO
	bool "Enable LZO decompression support"
	help
	  This enables support for LZO compression algorithm.r

config SPL_LZO
	bool "Enable LZO decompression support in SPL"
	help
	  This enables support for LZO compression algorithm in the SPL.

config SPL_GZIP
	bool "Enable gzip decompression support for SPL build"
	select SPL_ZLIB
	help
	  This enables support for GZIP compression altorithm for SPL boot.

config SPL_ZLIB
	bool
	help
	  This enables compression lib for SPL boot.

endmenu

config ERRNO_STR
	bool "Enable function for getting errno-related string message"
	help
	  The function errno_str(int errno), returns a pointer to the errno
	  corresponding text message:
	  - if errno is null or positive number - a pointer to "Success" message
	  - if errno is negative - a pointer to errno related message

config HEXDUMP
	bool "Enable hexdump"
	help
	  This enables functions for printing dumps of binary data.

config OF_LIBFDT
	bool "Enable the FDT library"
	default y if OF_CONTROL
	help
	  This enables the FDT library (libfdt). It provides functions for
	  accessing binary device tree images in memory, such as adding and
	  removing nodes and properties, scanning through the tree and finding
	  particular compatible nodes. The library operates on a flattened
	  version of the device tree.

config OF_LIBFDT_OVERLAY
	bool "Enable the FDT library overlay support"
	depends on OF_LIBFDT
	default y if ARCH_OMAP2PLUS || ARCH_KEYSTONE
	help
	  This enables the FDT library (libfdt) overlay support.

config SPL_OF_LIBFDT
	bool "Enable the FDT library for SPL"
	default y if SPL_OF_CONTROL
	help
	  This enables the FDT library (libfdt). It provides functions for
	  accessing binary device tree images in memory, such as adding and
	  removing nodes and properties, scanning through the tree and finding
	  particular compatible nodes. The library operates on a flattened
	  version of the device tree.

config TPL_OF_LIBFDT
	bool "Enable the FDT library for TPL"
	default y if TPL_OF_CONTROL
	help
	  This enables the FDT library (libfdt). It provides functions for
	  accessing binary device tree images in memory, such as adding and
	  removing nodes and properties, scanning through the tree and finding
	  particular compatible nodes. The library operates on a flattened
	  version of the device tree.

config FDT_FIXUP_PARTITIONS
	bool "overwrite MTD partitions in DTS through defined in 'mtdparts'"
	depends on OF_LIBFDT
	depends on CMD_MTDPARTS
	help
	  Allow overwriting defined partitions in the device tree blob
	  using partition info defined in the 'mtdparts' environment
	  variable.

menu "System tables"
	depends on (!EFI && !SYS_COREBOOT) || (ARM && EFI_LOADER)

config GENERATE_SMBIOS_TABLE
	bool "Generate an SMBIOS (System Management BIOS) table"
	default y
	depends on X86 || EFI_LOADER
	help
	  The System Management BIOS (SMBIOS) specification addresses how
	  motherboard and system vendors present management information about
	  their products in a standard format by extending the BIOS interface
	  on Intel architecture systems.

	  Check http://www.dmtf.org/standards/smbios for details.

config SMBIOS_MANUFACTURER
	string "SMBIOS Manufacturer"
	depends on GENERATE_SMBIOS_TABLE
	default SYS_VENDOR
	help
	  The board manufacturer to store in SMBIOS structures.
	  Change this to override the default one (CONFIG_SYS_VENDOR).

config SMBIOS_PRODUCT_NAME
	string "SMBIOS Product Name"
	depends on GENERATE_SMBIOS_TABLE
	default SYS_BOARD
	help
	  The product name to store in SMBIOS structures.
	  Change this to override the default one (CONFIG_SYS_BOARD).

endmenu

source lib/efi/Kconfig
source lib/efi_loader/Kconfig
source lib/optee/Kconfig

endmenu