11 depends on SUPPORT_SPL
14 If you want to build SPL as well as the normal image, say Y.
16 config SPL_SYS_MALLOC_SIMPLE
19 prompt "Only use malloc_simple functions in the SPL"
21 Say Y here to only use the *_simple malloc functions from
22 malloc_simple.c, rather then using the versions from dlmalloc.c;
23 this will make the SPL binary smaller at the cost of more heap
24 usage as the *_simple malloc functions do not re-use free-ed mem.
28 bool "Enable SDRAM location for SPL stack"
30 SPL starts off execution in SRAM and thus typically has only a small
31 stack available. Since SPL sets up DRAM while in its board_init_f()
32 function, it is possible for the stack to move there before
33 board_init_r() is reached. This option enables a special SDRAM
34 location for the SPL stack. U-Boot SPL switches to this after
35 board_init_f() completes, and before board_init_r() starts.
37 config SPL_STACK_R_ADDR
38 depends on SPL_STACK_R
39 hex "SDRAM location for SPL stack"
41 Specify the address in SDRAM for the SPL stack. This will be set up
42 before board_init_r() is called.
44 config SPL_STACK_R_MALLOC_SIMPLE_LEN
45 depends on SPL_STACK_R && SPL_SYS_MALLOC_SIMPLE
46 hex "Size of malloc_simple heap after switching to DRAM SPL stack"
49 Specify the amount of the stack to use as memory pool for
50 malloc_simple after switching the stack to DRAM. This may be set
51 to give board_init_r() a larger heap then the initial heap in
52 SRAM which is limited to SYS_MALLOC_F_LEN bytes.
54 config SPL_SEPARATE_BSS
56 bool "BSS section is in a different memory region from text"
58 Some platforms need a large BSS region in SPL and can provide this
59 because RAM is already set up. In this case BSS can be moved to RAM.
60 This option should then be enabled so that the correct device tree
61 location is used. Normally we put the device tree at the end of BSS
62 but with this option enabled, it goes at _image_binary_end.
64 config SPL_DISPLAY_PRINT
66 bool "Display a board-specific message in SPL"
68 If this option is enabled, U-Boot will call the function
69 spl_display_print() immediately after displaying the SPL console
70 banner ("U-Boot SPL ..."). This function should be provided by
75 depends on SPL && SUPPORT_TPL
78 If you want to build TPL as well as the normal image and SPL, say Y.
80 config SPL_CRC32_SUPPORT
84 Enable this to support CRC32 in FIT images within SPL. This is a
85 32-bit checksum value that can be used to verify images. This is
86 the least secure type of checksum, suitable for detected
87 accidental image corruption. For secure applications you should
88 consider SHA1 or SHA256.
90 config SPL_MD5_SUPPORT
94 Enable this to support MD5 in FIT images within SPL. An MD5
95 checksum is a 128-bit hash value used to check that the image
96 contents have not been corrupted. Note that MD5 is not considered
97 secure as it is possible (with a brute-force attack) to adjust the
98 image while still retaining the same MD5 hash value. For secure
99 applications where images may be changed maliciously, you should
100 consider SHA1 or SHA256.
102 config SPL_SHA1_SUPPORT
106 Enable this to support SHA1 in FIT images within SPL. A SHA1
107 checksum is a 160-bit (20-byte) hash value used to check that the
108 image contents have not been corrupted or maliciously altered.
109 While SHA1 is fairly secure it is coming to the end of its life
110 due to the expanding computing power avaiable to brute-force
111 attacks. For more security, consider SHA256.
113 config SPL_SHA256_SUPPORT
114 bool "Support SHA256"
117 Enable this to support SHA256 in FIT images within SPL. A SHA256
118 checksum is a 256-bit (32-byte) hash value used to check that the
119 image contents have not been corrupted. SHA256 is recommended for
120 use in secure applications since (as at 2016) there is no known
121 feasible attack that could produce a 'collision' with differing
122 input data. Use this for the highest security. Note that only the
123 SHA256 variant is supported: SHA512 and others are not currently
126 config SPL_CRYPTO_SUPPORT
127 bool "Support crypto drivers"
130 Enable crypto drivers in SPL. These drivers can be used to
131 accelerate secure boot processing in secure applications. Enable
132 this option to build the drivers in drivers/crypto as part of an
135 config SPL_HASH_SUPPORT
136 bool "Support hashing drivers"
139 Enable hashing drivers in SPL. These drivers can be used to
140 accelerate secure boot processing in secure applications. Enable
141 this option to build system-specific drivers for hash acceleration
142 as part of an SPL build.
144 config SPL_DMA_SUPPORT
145 bool "Support DMA drivers"
148 Enable DMA (direct-memory-access) drivers in SPL. These drivers
149 can be used to handle memory-to-peripheral data transfer without
150 the CPU moving the data. Enable this option to build the drivers
151 in drivers/dma as part of an SPL build.
153 config SPL_DRIVERS_MISC_SUPPORT
154 bool "Support misc drivers"
157 Enable miscellaneous drivers in SPL. These drivers perform various
158 tasks that don't fall nicely into other categories, Enable this
159 option to build the drivers in drivers/misc as part of an SPL
160 build, for those that support building in SPL (not all drivers do).
162 config SPL_ENV_SUPPORT
163 bool "Support an environment"
166 Enable environment support in SPL. The U-Boot environment provides
167 a number of settings (essentially name/value pairs) which can
168 control many aspects of U-Boot's operation. Normally this is not
169 needed in SPL as it has a much simpler task with less
170 configuration. But some boards use this to support 'Falcon' boot
171 on EXT2 and FAT, where SPL boots directly into Linux without
172 starting U-Boot first. Enabling this option will make getenv()
173 and setenv() available in SPL.
176 bool "Support save environment"
177 depends on SPL && SPL_ENV_SUPPORT
179 Enable save environment support in SPL after setenv. By default
180 the saveenv option is not provided in SPL, but some boards need
181 this support in 'Falcon' boot, where SPL need to boot from
182 different images based on environment variable set by OS. For
183 example OS may set "reboot_image" environment variable to
184 "recovery" inorder to boot recovery image by SPL. The SPL read
185 "reboot_image" and act accordingly and change the reboot_image
186 to default mode using setenv and save the environemnt.
188 config SPL_ETH_SUPPORT
189 bool "Support Ethernet"
190 depends on SPL_ENV_SUPPORT
192 Enable access to the network subsystem and associated Ethernet
193 drivers in SPL. This permits SPL to load U-Boot over an Ethernet
194 link rather than from an on-board peripheral. Environment support
195 is required since the network stack uses a number of environment
196 variables. See also SPL_NET_SUPPORT.
198 config SPL_EXT_SUPPORT
199 bool "Support EXT filesystems"
202 Enable support for EXT2/3/4 filesystems with SPL. This permits
203 U-Boot (or Linux in Falcon mode) to be loaded from an EXT
204 filesystem from within SPL. Support for the underlying block
205 device (e.g. MMC or USB) must be enabled separately.
207 config SPL_FAT_SUPPORT
208 bool "Support FAT filesystems"
211 Enable support for FAT and VFAT filesystems with SPL. This
212 permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
213 filesystem from within SPL. Support for the underlying block
214 device (e.g. MMC or USB) must be enabled separately.
216 config SPL_FPGA_SUPPORT
220 Enable support for FPGAs in SPL. Field-programmable Gate Arrays
221 provide software-configurable hardware which is typically used to
222 implement peripherals (such as UARTs, LCD displays, MMC) or
223 accelerate custom processing functions, such as image processing
224 or machine learning. Sometimes it is useful to program the FPGA
225 as early as possible during boot, and this option can enable that
228 config SPL_GPIO_SUPPORT
232 Enable support for GPIOs (General-purpose Input/Output) in SPL.
233 GPIOs allow U-Boot to read the state of an input line (high or
234 low) and set the state of an output line. This can be used to
235 drive LEDs, control power to various system parts and read user
236 input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
237 for example. Enable this option to build the drivers in
238 drivers/gpio as part of an SPL build.
240 config SPL_I2C_SUPPORT
244 Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
245 I2C works with a clock and data line which can be driven by a
246 one or more masters or slaves. It is a fairly complex bus but is
247 widely used as it only needs two lines for communication. Speeds of
248 400kbps are typical but up to 3.4Mbps is supported by some
249 hardware. I2C can be useful in SPL to configure power management
250 ICs (PMICs) before raising the CPU clock speed, for example.
251 Enable this option to build the drivers in drivers/i2c as part of
254 config SPL_LIBCOMMON_SUPPORT
255 bool "Support common libraries"
258 Enable support for common U-Boot libraries within SPL. These
259 libraries include common code to deal with U-Boot images,
260 environment and USB, for example. This option is enabled on many
261 boards. Enable this option to build the code in common/ as part of
264 config SPL_LIBDISK_SUPPORT
265 bool "Support disk paritions"
268 Enable support for disk partitions within SPL. 'Disk' is something
269 of a misnomer as it includes non-spinning media such as flash (as
270 used in MMC and USB sticks). Partitions provide a way for a disk
271 to be split up into separate regions, with a partition table placed
272 at the start or end which describes the location and size of each
273 'partition'. These partitions are typically uses as individual block
274 devices, typically with an EXT2 or FAT filesystem in each. This
275 option enables whatever partition support has been enabled in
276 U-Boot to also be used in SPL. It brings in the code in disk/.
278 config SPL_LIBGENERIC_SUPPORT
279 bool "Support generic libraries"
282 Enable support for generic U-Boot libraries within SPL. These
283 libraries include generic code to deal with device tree, hashing,
284 printf(), compression and the like. This option is enabled on many
285 boards. Enable this option to build the code in lib/ as part of an
288 config SPL_MMC_SUPPORT
292 Enable support for MMC (Multimedia Card) within SPL. This enables
293 the MMC protocol implementation and allows any enabled drivers to
294 be used within SPL. MMC can be used with or without disk partition
295 support depending on the application (SPL_LIBDISK_SUPPORT). Enable
296 this option to build the drivers in drivers/mmc as part of an SPL
299 config SPL_MPC8XXX_INIT_DDR_SUPPORT
300 bool "Support MPC8XXX DDR init"
303 Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
304 random-access memory) on the MPC8XXX family within SPL. This
305 allows DRAM to be set up before loading U-Boot into that DRAM,
308 config SPL_MTD_SUPPORT
309 bool "Support MTD drivers"
312 Enable support for MTD (Memory Technology Device) within SPL. MTD
313 provides a block interface over raw NAND and can also be used with
314 SPI flash. This allows SPL to load U-Boot from supported MTD
315 devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
316 to enable specific MTD drivers.
318 config SPL_MUSB_NEW_SUPPORT
319 bool "Support new Mentor Graphics USB"
322 Enable support for Mentor Graphics USB in SPL. This is a new
323 driver used by some boards. Enable this option to build
324 the drivers in drivers/usb/musb-new as part of an SPL build. The
325 old drivers are in drivers/usb/musb.
327 config SPL_NAND_SUPPORT
328 bool "Support NAND flash"
331 Enable support for NAND (Negative AND) flash in SPL. NAND flash
332 can be used to allow SPL to load U-Boot from supported devices.
333 This enables the drivers in drivers/mtd/nand as part of an SPL
336 config SPL_NET_SUPPORT
337 bool "Support networking"
340 Enable support for network devices (such as Ethernet) in SPL.
341 This permits SPL to load U-Boot over a network link rather than
342 from an on-board peripheral. Environment support is required since
343 the network stack uses a number of environment variables. See also
347 config SPL_NET_VCI_STRING
348 string "BOOTP Vendor Class Identifier string sent by SPL"
350 As defined by RFC 2132 the vendor class identifier field can be
351 sent by the client to identify the vendor type and configuration
352 of a client. This is often used in practice to allow for the DHCP
353 server to specify different files to load depending on if the ROM,
354 SPL or U-Boot itself makes the request
355 endif # if SPL_NET_SUPPORT
357 config SPL_NO_CPU_SUPPORT
358 bool "Drop CPU code in SPL"
361 This is specific to the ARM926EJ-S CPU. It disables the standard
362 start.S start-up code, presumably so that a replacement can be
363 used on that CPU. You should not enable it unless you know what
366 config SPL_NOR_SUPPORT
367 bool "Support NOR flash"
370 Enable support for loading U-Boot from memory-mapped NOR (Negative
371 OR) flash in SPL. NOR flash is slow to write but fast to read, and
372 a memory-mapped device makes it very easy to access. Loading from
373 NOR is typically achieved with just a memcpy().
375 config SPL_ONENAND_SUPPORT
376 bool "Support OneNAND flash"
379 Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
380 a type of NAND flash and therefore can be used to allow SPL to
381 load U-Boot from supported devices. This enables the drivers in
382 drivers/mtd/onenand as part of an SPL build.
384 config SPL_POST_MEM_SUPPORT
385 bool "Support POST drivers"
388 Enable support for POST (Power-on Self Test) in SPL. POST is a
389 procedure that checks that the hardware (CPU or board) appears to
390 be functionally correctly. It is a sanity check that can be
391 performed before booting. This enables the drivers in post/drivers
392 as part of an SPL build.
394 config SPL_POWER_SUPPORT
395 bool "Support power drivers"
398 Enable support for power control in SPL. This includes support
399 for PMICs (Power-management Integrated Circuits) and some of the
400 features provided by PMICs. In particular, voltage regulators can
401 be used to enable/disable power and vary its voltage. That can be
402 useful in SPL to turn on boot peripherals and adjust CPU voltage
403 so that the clock speed can be increased. This enables the drivers
404 in drivers/power, drivers/power/pmic and drivers/power/regulator
405 as part of an SPL build.
407 config SPL_SATA_SUPPORT
408 bool "Support loading from SATA"
411 Enable support for SATA (Serial AT attachment) in SPL. This allows
412 use of SATA devices such as hard drives and flash drivers for
413 loading U-Boot. SATA is used in higher-end embedded systems and
414 can provide higher performance than MMC , at somewhat higher
415 expense and power consumption. This enables loading from SATA
416 using a configured device.
418 config SPL_SERIAL_SUPPORT
419 bool "Support serial"
422 Enable support for serial in SPL. This allows use of a serial UART
423 for displaying messages while SPL is running. It also brings in
424 printf() and panic() functions. This should normally be enabled
425 unless there are space reasons not to. Even then, consider
426 enabling USE_TINY_PRINTF which is a small printf() version.
428 config SPL_SPI_FLASH_SUPPORT
429 bool "Support SPI flash drivers"
432 Enable support for using SPI flash in SPL, and loading U-Boot from
433 SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
434 the SPI bus that is used to connect it to a system. It is a simple
435 but fast bidirectional 4-wire bus (clock, chip select and two data
436 lines). This enables the drivers in drivers/mtd/spi as part of an
437 SPL build. This normally requires SPL_SPI_SUPPORT.
439 config SPL_SPI_SUPPORT
440 bool "Support SPI drivers"
443 Enable support for using SPI in SPL. This is used for connecting
444 to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
445 more details on that. The SPI driver provides the transport for
446 data between the SPI flash and the CPU. This option can be used to
447 enable SPI drivers that are needed for other purposes also, such
450 config SPL_USBETH_SUPPORT
451 bool "Support USB Ethernet drivers"
454 Enable access to the USB network subsystem and associated
455 drivers in SPL. This permits SPL to load U-Boot over a
456 USB-connected Ethernet link (such as a USB Ethernet dongle) rather
457 than from an onboard peripheral. Environment support is required
458 since the network stack uses a number of environment variables.
459 See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
461 config SPL_USB_HOST_SUPPORT
462 bool "Support USB host drivers"
465 Enable access to USB (Universal Serial Bus) host devices so that
466 SPL can load U-Boot from a connected USB peripheral, such as a USB
467 flash stick. While USB takes a little longer to start up than most
468 buses, it is very flexible since many different types of storage
469 device can be attached. This option enables the drivers in
470 drivers/usb/host as part of an SPL build.
472 config SPL_USB_SUPPORT
473 bool "Support loading from USB"
474 depends on SPL_USB_HOST_SUPPORT
476 Enable support for USB devices in SPL. This allows use of USB
477 devices such as hard drives and flash drivers for loading U-Boot.
478 The actual drivers are enabled separately using the normal U-Boot
479 config options. This enables loading from USB using a configured
482 config SPL_WATCHDOG_SUPPORT
483 bool "Support watchdog drivers"
486 Enable support for watchdog drivers in SPL. A watchdog is
487 typically a hardware peripheral which can reset the system when it
488 detects no activity for a while (such as a software crash). This
489 enables the drivers in drivers/watchdog as part of an SPL build.
491 config SPL_YMODEM_SUPPORT
492 bool "Support loading using Ymodem"
495 While loading from serial is slow it can be a useful backup when
496 there is no other option. The Ymodem protocol provides a reliable
497 means of transmitting U-Boot over a serial line for using in SPL,
498 with a checksum to ensure correctness.
500 config TPL_ENV_SUPPORT
501 bool "Support an environment"
504 Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
506 config TPL_I2C_SUPPORT
510 Enable support for the I2C bus in SPL. See SPL_I2C_SUPPORT for
513 config TPL_LIBCOMMON_SUPPORT
514 bool "Support common libraries"
517 Enable support for common U-Boot libraries within TPL. See
518 SPL_LIBCOMMON_SUPPORT for details.
520 config TPL_LIBGENERIC_SUPPORT
521 bool "Support generic libraries"
524 Enable support for generic U-Boot libraries within TPL. See
525 SPL_LIBGENERIC_SUPPORT for details.
527 config TPL_MPC8XXX_INIT_DDR_SUPPORT
528 bool "Support MPC8XXX DDR init"
531 Enable support for DDR-SDRAM on the MPC8XXX family within TPL. See
532 SPL_MPC8XXX_INIT_DDR_SUPPORT for details.
534 config TPL_MMC_SUPPORT
538 Enable support for MMC within TPL. See SPL_MMC_SUPPORT for details.
540 config TPL_NAND_SUPPORT
541 bool "Support NAND flash"
544 Enable support for NAND in SPL. See SPL_NAND_SUPPORT for details.
546 config TPL_SERIAL_SUPPORT
547 bool "Support serial"
550 Enable support for serial in SPL. See SPL_SERIAL_SUPPORT for
553 config TPL_SPI_FLASH_SUPPORT
554 bool "Support SPI flash drivers"
557 Enable support for using SPI flash in SPL. See SPL_SPI_FLASH_SUPPORT
560 config TPL_SPI_SUPPORT
561 bool "Support SPI drivers"
564 Enable support for using SPI in SPL. See SPL_SPI_SUPPORT for