xref: /openbmc/u-boot/common/spl/Kconfig (revision fc0b5948)
1menu "SPL / TPL"
2
3config SUPPORT_SPL
4	bool
5
6config SUPPORT_TPL
7	bool
8
9config SPL
10	bool
11	depends on SUPPORT_SPL
12	prompt "Enable SPL"
13	help
14	  If you want to build SPL as well as the normal image, say Y.
15
16config SPL_SYS_MALLOC_SIMPLE
17	bool
18	depends on SPL
19	prompt "Only use malloc_simple functions in the SPL"
20	help
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.
25
26config SPL_STACK_R
27	depends on SPL
28	bool "Enable SDRAM location for SPL stack"
29	help
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.
36
37config SPL_STACK_R_ADDR
38	depends on SPL_STACK_R
39	hex "SDRAM location for SPL stack"
40	help
41	  Specify the address in SDRAM for the SPL stack. This will be set up
42	  before board_init_r() is called.
43
44config 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"
47	default 0x100000
48	help
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.
53
54config SPL_SEPARATE_BSS
55	depends on SPL
56	bool "BSS section is in a different memory region from text"
57	help
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.
63
64config SPL_DISPLAY_PRINT
65	depends on SPL
66	bool "Display a board-specific message in SPL"
67	help
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
71	  the board.
72
73config TPL
74	bool
75	depends on SPL && SUPPORT_TPL
76	prompt "Enable TPL"
77	help
78	  If you want to build TPL as well as the normal image and SPL, say Y.
79
80config SPL_CRC32_SUPPORT
81	bool "Support CRC32"
82	depends on SPL_FIT
83	help
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.
89
90config SPL_MD5_SUPPORT
91	bool "Support MD5"
92	depends on SPL_FIT
93	help
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.
101
102config SPL_SHA1_SUPPORT
103	bool "Support SHA1"
104	depends on SPL_FIT
105	help
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.
112
113config SPL_SHA256_SUPPORT
114	bool "Support SHA256"
115	depends on SPL_FIT
116	help
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
124	  supported in U-Boot.
125
126config SPL_CRYPTO_SUPPORT
127	bool "Support crypto drivers"
128	depends on SPL
129	help
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
133	  SPL build.
134
135config SPL_HASH_SUPPORT
136	bool "Support hashing drivers"
137	depends on SPL
138	help
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.
143
144config SPL_DMA_SUPPORT
145	bool "Support DMA drivers"
146	depends on SPL
147	help
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.
152
153config SPL_DRIVERS_MISC_SUPPORT
154	bool "Support misc drivers"
155	depends on SPL
156	help
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).
161
162config SPL_ENV_SUPPORT
163	bool "Support an environment"
164	depends on SPL
165	help
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.
174
175config SPL_ETH_SUPPORT
176	bool "Support Ethernet"
177	depends on SPL_ENV_SUPPORT
178	help
179	  Enable access to the network subsystem and associated Ethernet
180	  drivers in SPL. This permits SPL to load U-Boot over an Ethernet
181	  link rather than from an on-board peripheral. Environment support
182	  is required since the network stack uses a number of environment
183	  variables. See also SPL_NET_SUPPORT.
184
185config SPL_EXT_SUPPORT
186	bool "Support EXT filesystems"
187	depends on SPL
188	help
189	  Enable support for EXT2/3/4 filesystems with SPL. This permits
190	  U-Boot (or Linux in Falcon mode) to be loaded from an EXT
191	  filesystem from within SPL. Support for the underlying block
192	  device (e.g. MMC or USB) must be enabled separately.
193
194config SPL_FAT_SUPPORT
195	bool "Support FAT filesystems"
196	depends on SPL
197	help
198	  Enable support for FAT and VFAT filesystems with SPL. This
199	  permits U-Boot (or Linux in Falcon mode) to be loaded from a FAT
200	  filesystem from within SPL. Support for the underlying block
201	  device (e.g. MMC or USB) must be enabled separately.
202
203config SPL_FPGA_SUPPORT
204	bool "Support FPGAs"
205	depends on SPL
206	help
207	  Enable support for FPGAs in SPL. Field-programmable Gate Arrays
208	  provide software-configurable hardware which is typically used to
209	  implement peripherals (such as UARTs, LCD displays, MMC) or
210	  accelerate custom processing functions, such as image processing
211	  or machine learning. Sometimes it is useful to program the FPGA
212	  as early as possible during boot, and this option can enable that
213	  within SPL.
214
215config SPL_GPIO_SUPPORT
216	bool "Support GPIO"
217	depends on SPL
218	help
219	  Enable support for GPIOs (General-purpose Input/Output) in SPL.
220	  GPIOs allow U-Boot to read the state of an input line (high or
221	  low) and set the state of an output line. This can be used to
222	  drive LEDs, control power to various system parts and read user
223	  input. GPIOs can be useful in SPL to enable a 'sign-of-life' LED,
224	  for example. Enable this option to build the drivers in
225	  drivers/gpio as part of an SPL build.
226
227config SPL_I2C_SUPPORT
228	bool "Support I2C"
229	depends on SPL
230	help
231	  Enable support for the I2C (Inter-Integrated Circuit) bus in SPL.
232	  I2C works with a clock and data line which can be driven by a
233	  one or more masters or slaves. It is a fairly complex bus but is
234	  widely used as it only needs two lines for communication. Speeds of
235	  400kbps are typical but up to 3.4Mbps is supported by some
236	  hardware. I2C can be useful in SPL to configure power management
237	  ICs (PMICs) before raising the CPU clock speed, for example.
238	  Enable this option to build the drivers in drivers/i2c as part of
239	  an SPL build.
240
241config SPL_LIBCOMMON_SUPPORT
242	bool "Support common libraries"
243	depends on SPL
244	help
245	  Enable support for common U-Boot libraries within SPL. These
246	  libraries include common code to deal with U-Boot images,
247	  environment and USB, for example. This option is enabled on many
248	  boards. Enable this option to build the code in common/ as part of
249	  an SPL build.
250
251config SPL_LIBDISK_SUPPORT
252	bool "Support disk paritions"
253	depends on SPL
254	help
255	  Enable support for disk partitions within SPL. 'Disk' is something
256	  of a misnomer as it includes non-spinning media such as flash (as
257	  used in MMC and USB sticks). Partitions provide a way for a disk
258	  to be split up into separate regions, with a partition table placed
259	  at the start or end which describes the location and size of each
260	  'partition'. These partitions are typically uses as individual block
261	  devices, typically with an EXT2 or FAT filesystem in each. This
262	  option enables whatever partition support has been enabled in
263	  U-Boot to also be used in SPL. It brings in the code in disk/.
264
265config SPL_LIBGENERIC_SUPPORT
266	bool "Support generic libraries"
267	depends on SPL
268	help
269	  Enable support for generic U-Boot libraries within SPL. These
270	  libraries include generic code to deal with device tree, hashing,
271	  printf(), compression and the like. This option is enabled on many
272	  boards. Enable this option to build the code in lib/ as part of an
273	  SPL build.
274
275config SPL_MMC_SUPPORT
276	bool "Support MMC"
277	depends on SPL
278	help
279	  Enable support for MMC (Multimedia Card) within SPL. This enables
280	  the MMC protocol implementation and allows any enabled drivers to
281	  be used within SPL. MMC can be used with or without disk partition
282	  support depending on the application (SPL_LIBDISK_SUPPORT). Enable
283	  this option to build the drivers in drivers/mmc as part of an SPL
284	  build.
285
286config SPL_MPC8XXX_INIT_DDR_SUPPORT
287	bool "Support MPC8XXX DDR init"
288	depends on SPL
289	help
290	  Enable support for DDR-SDRAM (double-data-rate synchronous dynamic
291	  random-access memory) on the MPC8XXX family within SPL. This
292	  allows DRAM to be set up before loading U-Boot into that DRAM,
293	  where it can run.
294
295config SPL_MTD_SUPPORT
296	bool "Support MTD drivers"
297	depends on SPL
298	help
299	  Enable support for MTD (Memory Technology Device) within SPL. MTD
300	  provides a block interface over raw NAND and can also be used with
301	  SPI flash. This allows SPL to load U-Boot from supported MTD
302	  devices. See SPL_NAND_SUPPORT and SPL_ONENAND_SUPPORT for how
303	  to enable specific MTD drivers.
304
305config SPL_MUSB_NEW_SUPPORT
306	bool "Support new Mentor Graphics USB"
307	depends on SPL
308	help
309	  Enable support for Mentor Graphics USB in SPL. This is a new
310	  driver used by some boards. Enable this option to build
311	  the drivers in drivers/usb/musb-new as part of an SPL build. The
312	  old drivers are in drivers/usb/musb.
313
314config SPL_NAND_SUPPORT
315	bool "Support NAND flash"
316	depends on SPL
317	help
318	  Enable support for NAND (Negative AND) flash in SPL. NAND flash
319	  can be used to allow SPL to load U-Boot from supported devices.
320	  This enables the drivers in drivers/mtd/nand as part of an SPL
321	  build.
322
323config SPL_NET_SUPPORT
324	bool "Support networking"
325	depends on SPL
326	help
327	  Enable support for network devices (such as Ethernet) in SPL.
328	  This permits SPL to load U-Boot over a network link rather than
329	  from an on-board peripheral. Environment support is required since
330	  the network stack uses a number of environment variables. See also
331	  SPL_ETH_SUPPORT.
332
333if SPL_NET_SUPPORT
334config SPL_NET_VCI_STRING
335	string "BOOTP Vendor Class Identifier string sent by SPL"
336	help
337	  As defined by RFC 2132 the vendor class identifier field can be
338	  sent by the client to identify the vendor type and configuration
339	  of a client.  This is often used in practice to allow for the DHCP
340	  server to specify different files to load depending on if the ROM,
341	  SPL or U-Boot itself makes the request
342endif   # if SPL_NET_SUPPORT
343
344config SPL_NO_CPU_SUPPORT
345	bool "Drop CPU code in SPL"
346	depends on SPL
347	help
348	  This is specific to the ARM926EJ-S CPU. It disables the standard
349	  start.S start-up code, presumably so that a replacement can be
350	  used on that CPU. You should not enable it unless you know what
351	  you are doing.
352
353config SPL_NOR_SUPPORT
354	bool "Support NOR flash"
355	depends on SPL
356	help
357	  Enable support for loading U-Boot from memory-mapped NOR (Negative
358	  OR) flash in SPL. NOR flash is slow to write but fast to read, and
359	  a memory-mapped device makes it very easy to access. Loading from
360	  NOR is typically achieved with just a memcpy().
361
362config SPL_ONENAND_SUPPORT
363	bool "Support OneNAND flash"
364	depends on SPL
365	help
366	  Enable support for OneNAND (Negative AND) flash in SPL. OneNAND is
367	  a type of NAND flash and therefore can be used to allow SPL to
368	  load U-Boot from supported devices. This enables the drivers in
369	  drivers/mtd/onenand as part of an SPL build.
370
371config SPL_POST_MEM_SUPPORT
372	bool "Support POST drivers"
373	depends on SPL
374	help
375	  Enable support for POST (Power-on Self Test) in SPL. POST is a
376	  procedure that checks that the hardware (CPU or board) appears to
377	  be functionally correctly. It is a sanity check that can be
378	  performed before booting. This enables the drivers in post/drivers
379	  as part of an SPL build.
380
381config SPL_POWER_SUPPORT
382	bool "Support power drivers"
383	depends on SPL
384	help
385	  Enable support for power control in SPL. This includes support
386	  for PMICs (Power-management Integrated Circuits) and some of the
387	  features provided by PMICs. In particular, voltage regulators can
388	  be used to enable/disable power and vary its voltage. That can be
389	  useful in SPL to turn on boot peripherals and adjust CPU voltage
390	  so that the clock speed can be increased. This enables the drivers
391	  in drivers/power, drivers/power/pmic and drivers/power/regulator
392	  as part of an SPL build.
393
394config SPL_SATA_SUPPORT
395	bool "Support loading from SATA"
396	depends on SPL
397	help
398	  Enable support for SATA (Serial AT attachment) in SPL. This allows
399	  use of SATA devices such as hard drives and flash drivers for
400	  loading U-Boot. SATA is used in higher-end embedded systems and
401	  can provide higher performance than MMC , at somewhat higher
402	  expense and power consumption. This enables loading from SATA
403	  using a configured device.
404
405config SPL_SERIAL_SUPPORT
406	bool "Support serial"
407	depends on SPL
408	help
409	  Enable support for serial in SPL. This allows use of a serial UART
410	  for displaying messages while SPL is running. It also brings in
411	  printf() and panic() functions. This should normally be enabled
412	  unless there are space reasons not to. Even then, consider
413	  enabling USE_TINY_PRINTF which is a small printf() version.
414
415config SPL_SPI_FLASH_SUPPORT
416	bool "Support SPI flash drivers"
417	depends on SPL
418	help
419	  Enable support for using SPI flash in SPL, and loading U-Boot from
420	  SPI flash. SPI flash (Serial Peripheral Bus flash) is named after
421	  the SPI bus that is used to connect it to a system. It is a simple
422	  but fast bidirectional 4-wire bus (clock, chip select and two data
423	  lines). This enables the drivers in drivers/mtd/spi as part of an
424	  SPL build. This normally requires SPL_SPI_SUPPORT.
425
426config SPL_SPI_SUPPORT
427	bool "Support SPI drivers"
428	depends on SPL
429	help
430	  Enable support for using SPI in SPL. This is used for connecting
431	  to SPI flash for loading U-Boot. See SPL_SPI_FLASH_SUPPORT for
432	  more details on that. The SPI driver provides the transport for
433	  data between the SPI flash and the CPU. This option can be used to
434	  enable SPI drivers that are needed for other purposes also, such
435	  as a SPI PMIC.
436
437config SPL_USBETH_SUPPORT
438	bool "Support USB Ethernet drivers"
439	depends on SPL
440	help
441	  Enable access to the USB network subsystem and associated
442	  drivers in SPL. This permits SPL to load U-Boot over a
443	  USB-connected Ethernet link (such as a USB Ethernet dongle) rather
444	  than from an onboard peripheral. Environment support is required
445	  since the network stack uses a number of environment variables.
446	  See also SPL_NET_SUPPORT and SPL_ETH_SUPPORT.
447
448config SPL_USB_HOST_SUPPORT
449	bool "Support USB host drivers"
450	depends on SPL
451	help
452	  Enable access to USB (Universal Serial Bus) host devices so that
453	  SPL can load U-Boot from a connected USB peripheral, such as a USB
454	  flash stick. While USB takes a little longer to start up than most
455	  buses, it is very flexible since many different types of storage
456	  device can be attached. This option enables the drivers in
457	  drivers/usb/host as part of an SPL build.
458
459config SPL_USB_SUPPORT
460	bool "Support loading from USB"
461	depends on SPL_USB_HOST_SUPPORT
462	help
463	  Enable support for USB devices in SPL. This allows use of USB
464	  devices such as hard drives and flash drivers for loading U-Boot.
465	  The actual drivers are enabled separately using the normal U-Boot
466	  config options. This enables loading from USB using a configured
467	  device.
468
469config SPL_WATCHDOG_SUPPORT
470	bool "Support watchdog drivers"
471	depends on SPL
472	help
473	  Enable support for watchdog drivers in SPL. A watchdog is
474	  typically a hardware peripheral which can reset the system when it
475	  detects no activity for a while (such as a software crash). This
476	  enables the drivers in drivers/watchdog as part of an SPL build.
477
478config SPL_YMODEM_SUPPORT
479	bool "Support loading using Ymodem"
480	depends on SPL
481	help
482	  While loading from serial is slow it can be a useful backup when
483	  there is no other option. The Ymodem protocol provides a reliable
484	  means of transmitting U-Boot over a serial line for using in SPL,
485	  with a checksum to ensure correctness.
486
487config TPL_ENV_SUPPORT
488	bool "Support an environment"
489	depends on TPL
490	help
491	  Enable environment support in TPL. See SPL_ENV_SUPPORT for details.
492
493config TPL_I2C_SUPPORT
494	bool "Support I2C"
495	depends on TPL
496	help
497	  Enable support for the I2C bus in SPL. See SPL_I2C_SUPPORT for
498	  details.
499
500config TPL_LIBCOMMON_SUPPORT
501	bool "Support common libraries"
502	depends on TPL
503	help
504	  Enable support for common U-Boot libraries within TPL. See
505	  SPL_LIBCOMMON_SUPPORT for details.
506
507config TPL_LIBGENERIC_SUPPORT
508	bool "Support generic libraries"
509	depends on TPL
510	help
511	  Enable support for generic U-Boot libraries within TPL. See
512	  SPL_LIBGENERIC_SUPPORT for details.
513
514config TPL_MPC8XXX_INIT_DDR_SUPPORT
515	bool "Support MPC8XXX DDR init"
516	depends on TPL
517	help
518	  Enable support for DDR-SDRAM on the MPC8XXX family within TPL. See
519	  SPL_MPC8XXX_INIT_DDR_SUPPORT for details.
520
521config TPL_MMC_SUPPORT
522	bool "Support MMC"
523	depends on TPL
524	help
525	  Enable support for MMC within TPL. See SPL_MMC_SUPPORT for details.
526
527config TPL_NAND_SUPPORT
528	bool "Support NAND flash"
529	depends on TPL
530	help
531	  Enable support for NAND in SPL. See SPL_NAND_SUPPORT for details.
532
533config TPL_SERIAL_SUPPORT
534	bool "Support serial"
535	depends on TPL
536	help
537	  Enable support for serial in SPL. See SPL_SERIAL_SUPPORT for
538	  details.
539
540config TPL_SPI_FLASH_SUPPORT
541	bool "Support SPI flash drivers"
542	depends on TPL
543	help
544	  Enable support for using SPI flash in SPL. See SPL_SPI_FLASH_SUPPORT
545	  for details.
546
547config TPL_SPI_SUPPORT
548	bool "Support SPI drivers"
549	depends on TPL
550	help
551	  Enable support for using SPI in SPL. See SPL_SPI_SUPPORT for
552	  details.
553
554endmenu
555