target/linux/brcm2708/image/config.txt

   1 ################################################################################
   2 ##  Raspberry Pi Configuration Settings
   3 ##
   4 ##  Revision 14, 2012/10/22
   5 ##
   6 ##  Details taken from the eLinux wiki
   7 ##  For up-to-date information please refer to wiki page.
   8 ##
   9 ##  Wiki Location : http://elinux.org/RPi_config.txt
  10 ##
  11 ##
  12 ##  Description:
  13 ##    Details of each setting are described with each section that begins with
  14 ##    a double hashed comment ('##')
  15 ##    It is up to the user to remove the single hashed comment ('#') from each
  16 ##    option they want to enable, and to set the specific value of that option.
  17 ##
  18 ##  WARNING: Setting the following combination of parameters will set a
  19 ##  permanent bit within the SOC and your warranty is void.
  20 ##    over_voltage>0, and at least one of the following:
  21 ##      force_turbo=1
  22 ##      current_limit_override=0x5A000020
  23 ##      temp_limit>85
  24 ##
  25 ##  Overclock settings will be disabled at runtime if the SoC reaches temp_limit
  26 ##
  27 ################################################################################
  28
  29 ################################################################################
  30 ##  Standard Definition Video Settings
  31 ################################################################################
  32
  33 ## sdtv_mode
  34 ##     defines the TV standard for composite output
  35 ##
  36 ##     Value    Description
  37 ##     -------------------------------------------------------------------------
  38 ##     0        Normal NTSC (Default)
  39 ##     1        Japanese version of NTSC - no pedestal
  40 ##     2        Normal PAL
  41 ##     3        Brazilian version of PAL - 525/60 rather than 625/50, different
  42 ##              subcarrier
  43 ##
  44 #sdtv_mode=0
  45
  46 ## sdtv_aspect
  47 ##     defines the aspect ratio for composite output
  48 ##
  49 ##     Value    Description
  50 ##     -------------------------------------------------------------------------
  51 ##     1        4:3 (Default)
  52 ##     2        14:9
  53 ##     3        16:9
  54 ##
  55 #sdtv_aspect=1
  56
  57 ## sdtv_disable_colourburst
  58 ##     Disables colour burst on composite output. The picture will be
  59 ##     monochrome, but possibly sharper
  60 ##
  61 ##     Value    Description
  62 ##     -------------------------------------------------------------------------
  63 ##     0        Colour burst is enabled (Default)
  64 ##     1        Colour burst is disabled
  65 ##
  66 #sdtv_disable_colourburst=1
  67
  68 ################################################################################
  69 ##  High Definition Video Settings
  70 ################################################################################
  71
  72 ## hdmi_safe
  73 ##     Use "safe mode" settings to try to boot with maximum hdmi compatibility.
  74 ##
  75 ##     Value    Description
  76 ##     -------------------------------------------------------------------------
  77 ##     0        Disabled (Default)
  78 ##     1        Enabled (this does: hdmi_force_hotplug=1, config_hdmi_boost=4,
  79 ##                                  hdmi_group=1, hdmi_mode=1,
  80 ##                                  disable_overscan=0)
  81 ##
  82 #hdmi_safe=1
  83
  84 ## hdmi_force_hotplug
  85 ##     Pretends HDMI hotplug signal is asserted so it appears a HDMI display
  86 ##     is attached
  87 ##
  88 ##     Value    Description
  89 ##     -------------------------------------------------------------------------
  90 ##     0        Disabled (Default)
  91 ##     1        Use HDMI mode even if no HDMI monitor is detected
  92 ##
  93 #hdmi_force_hotplug=1
  94
  95 ## hdmi_ignore_hotplug
  96 ##     Pretends HDMI hotplug signal is not asserted so it appears a HDMI
  97 ##     display is not attached
  98 ##
  99 ##     Value    Description
 100 ##     -------------------------------------------------------------------------
 101 ##     0        Disabled (Default)
 102 ##     1        Use composite mode even if HDMI monitor is detected
 103 ##
 104 #hdmi_ignore_hotplug=1
 105
 106 ## hdmi_drive
 107 ##     chooses between HDMI and DVI modes
 108 ##
 109 ##     Value    Description
 110 ##     -------------------------------------------------------------------------
 111 ##     1        Normal DVI mode (No sound)
 112 ##     2        Normal HDMI mode (Sound will be sent if supported and enabled)
 113 ##
 114 #hdmi_drive=2
 115
 116 ## hdmi_ignore_edid
 117 ##     Enables the ignoring of EDID/display data
 118 ##
 119 #hdmi_ignore_edid=0xa5000080
 120
 121 ## hdmi_edid_file
 122 ##     Read the EDID data from the edid.dat file instead of from the attached
 123 ##     device
 124 ##
 125 ##     Value    Description
 126 ##     -------------------------------------------------------------------------
 127 ##     0        Read EDID data from attached device (Default)
 128 ##     1        Read EDID data from edid.txt file
 129 ##
 130 #hdmi_edid_file=1
 131
 132 ## hdmi_force_edid_audio
 133 ##     Pretends all audio formats are supported by display, allowing
 134 ##     passthrough of DTS/AC3 even when not reported as supported.
 135 ##
 136 ##     Value    Description
 137 ##     -------------------------------------------------------------------------
 138 ##     0        Use EDID provided values (Default)
 139 ##     1        Pretend all audio formats are supported
 140 ##
 141 #hdmi_force_edid_audio=1
 142
 143 ## avoid_edid_fuzzy_match
 144 ##     Avoid fuzzy matching of modes described in edid.
 145 ##
 146 ##     Value    Description
 147 ##     -------------------------------------------------------------------------
 148 ##     0        Use fuzzy matching (Default)
 149 ##     1        Avoid fuzzy matching
 150 ##
 151 #avoid_edid_fuzzy_match=1
 152
 153 ## hdmi_group
 154 ##     Defines the HDMI type
 155 ##
 156 ##     Value    Description
 157 ##     -------------------------------------------------------------------------
 158 ##     0        Use the preferred group reported by the edid (Default)
 159 ##     1        CEA
 160 ##     2        DMT
 161 ##
 162 #hdmi_group=1
 163
 164 ## hdmi_mode
 165 ##     defines screen resolution in CEA or DMT format
 166 ##
 167 ##     H means 16:9 variant (of a normally 4:3 mode).
 168 ##     2x means pixel doubled (i.e. higher clock rate, with each pixel repeated
 169 ##                                  twice)
 170 ##     4x means pixel quadrupled (i.e. higher clock rate, with each pixel
 171 ##                                     repeated four times)
 172 ##     reduced blanking means fewer bytes are used for blanking within the data
 173 ##                      stream (i.e. lower clock rate, with fewer wasted bytes)
 174 ##
 175 ##     Value    hdmi_group=CEA                  hdmi_group=DMT
 176 ##     -------------------------------------------------------------------------
 177 ##     1        VGA                             640x350   85Hz
 178 ##     2        480p  60Hz                      640x400   85Hz
 179 ##     3        480p  60Hz  H                   720x400   85Hz
 180 ##     4        720p  60Hz                      640x480   60Hz
 181 ##     5        1080i 60Hz                      640x480   72Hz
 182 ##     6        480i  60Hz                      640x480   75Hz
 183 ##     7        480i  60Hz  H                   640x480   85Hz
 184 ##     8        240p  60Hz                      800x600   56Hz
 185 ##     9        240p  60Hz  H                   800x600   60Hz
 186 ##     10       480i  60Hz  4x                  800x600   72Hz
 187 ##     11       480i  60Hz  4x H                800x600   75Hz
 188 ##     12       240p  60Hz  4x                  800x600   85Hz
 189 ##     13       240p  60Hz  4x H                800x600   120Hz
 190 ##     14       480p  60Hz  2x                  848x480   60Hz
 191 ##     15       480p  60Hz  2x H                1024x768  43Hz  DO NOT USE
 192 ##     16       1080p 60Hz                      1024x768  60Hz
 193 ##     17       576p  50Hz                      1024x768  70Hz
 194 ##     18       576p  50Hz  H                   1024x768  75Hz
 195 ##     19       720p  50Hz                      1024x768  85Hz
 196 ##     20       1080i 50Hz                      1024x768  120Hz
 197 ##     21       576i  50Hz                      1152x864  75Hz
 198 ##     22       576i  50Hz  H                   1280x768        reduced blanking
 199 ##     23       288p  50Hz                      1280x768  60Hz
 200 ##     24       288p  50Hz  H                   1280x768  75Hz
 201 ##     25       576i  50Hz  4x                  1280x768  85Hz
 202 ##     26       576i  50Hz  4x H                1280x768  120Hz reduced blanking
 203 ##     27       288p  50Hz  4x                  1280x800        reduced blanking
 204 ##     28       288p  50Hz  4x H                1280x800  60Hz
 205 ##     29       576p  50Hz  2x                  1280x800  75Hz
 206 ##     30       576p  50Hz  2x H                1280x800  85Hz
 207 ##     31       1080p 50Hz                      1280x800  120Hz reduced blanking
 208 ##     32       1080p 24Hz                      1280x960  60Hz
 209 ##     33       1080p 25Hz                      1280x960  85Hz
 210 ##     34       1080p 30Hz                      1280x960  120Hz reduced blanking
 211 ##     35       480p  60Hz  4x                  1280x1024 60Hz
 212 ##     36       480p  60Hz  4x H                1280x1024 75Hz
 213 ##     37       576p  50Hz  4x                  1280x1024 85Hz
 214 ##     38       576p  50Hz  4x H                1280x1024 120Hz reduced blanking
 215 ##     39       1080i 50Hz  reduced blanking    1360x768  60Hz
 216 ##     40       1080i 100Hz                     1360x768  120Hz reduced blanking
 217 ##     41       720p  100Hz                     1400x1050       reduced blanking
 218 ##     42       576p  100Hz                     1400x1050 60Hz
 219 ##     43       576p  100Hz H                   1400x1050 75Hz
 220 ##     44       576i  100Hz                     1400x1050 85Hz
 221 ##     45       576i  100Hz H                   1400x1050 120Hz reduced blanking
 222 ##     46       1080i 120Hz                     1440x900        reduced blanking
 223 ##     47       720p  120Hz                     1440x900  60Hz
 224 ##     48       480p  120Hz                     1440x900  75Hz
 225 ##     49       480p  120Hz H                   1440x900  85Hz
 226 ##     50       480i  120Hz                     1440x900  120Hz reduced blanking
 227 ##     51       480i  120Hz H                   1600x1200 60Hz
 228 ##     52       576p  200Hz                     1600x1200 65Hz
 229 ##     53       576p  200Hz H                   1600x1200 70Hz
 230 ##     54       576i  200Hz                     1600x1200 75Hz
 231 ##     55       576i  200Hz H                   1600x1200 85Hz
 232 ##     56       480p  240Hz                     1600x1200 120Hz reduced blanking
 233 ##     57       480p  240Hz H                   1680x1050       reduced blanking
 234 ##     58       480i  240Hz                     1680x1050 60Hz
 235 ##     59       480i  240Hz H                   1680x1050 75Hz
 236 ##     60                                       1680x1050 85Hz
 237 ##     61                                       1680x1050 120Hz reduced blanking
 238 ##     62                                       1792x1344 60Hz
 239 ##     63                                       1792x1344 75Hz
 240 ##     64                                       1792x1344 120Hz reduced blanking
 241 ##     65                                       1856x1392 60Hz
 242 ##     66                                       1856x1392 75Hz
 243 ##     67                                       1856x1392 120Hz reduced blanking
 244 ##     68                                       1920x1200       reduced blanking
 245 ##     69                                       1920x1200 60Hz
 246 ##     70                                       1920x1200 75Hz
 247 ##     71                                       1920x1200 85Hz
 248 ##     72                                       1920x1200 120Hz reduced blanking
 249 ##     73                                       1920x1440 60Hz
 250 ##     74                                       1920x1440 75Hz
 251 ##     75                                       1920x1440 120Hz reduced blanking
 252 ##     76                                       2560x1600       reduced blanking
 253 ##     77                                       2560x1600 60Hz
 254 ##     78                                       2560x1600 75Hz
 255 ##     79                                       2560x1600 85Hz
 256 ##     80                                       2560x1600 120Hz reduced blanking
 257 ##     81                                       1366x768  60Hz
 258 ##     82                                       1080p     60Hz
 259 ##     83                                       1600x900        reduced blanking
 260 ##     84                                       2048x1152       reduced blanking
 261 ##     85                                       720p      60Hz
 262 ##     86                                       1366x768        reduced blanking
 263 ##
 264 #hdmi_mode=1
 265
 266 ## config_hdmi_boost
 267 ##     configure the signal strength of the HDMI interface.
 268 ##
 269 ##     Value    Description
 270 ##     -------------------------------------------------------------------------
 271 ##     0        (Default)
 272 ##     1
 273 ##     2
 274 ##     3
 275 ##     4        Try if you have interference issues with HDMI
 276 ##     5
 277 ##     6
 278 ##     7        Maximum
 279 ##
 280 #config_hdmi_boost=0
 281
 282 ## hdmi_ignore_cec_init
 283 ##     Doesn't sent initial active source message.  Avoids bringing
 284 ##     (CEC enabled) TV out of standby and channel switch when rebooting.
 285 ##
 286 ##     Value    Description
 287 ##     -------------------------------------------------------------------------
 288 ##     0        Normal behaviour (Default)
 289 ##     1        Doesn't sent initial active source message
 290 ##
 291 #hdmi_ignore_cec_init=1
 292
 293 ## hdmi_ignore_cec
 294 ##     Pretends CEC is not supported at all by TV.
 295 ##     No CEC functions will be supported.
 296 ##
 297 ##     Value    Description
 298 ##     -------------------------------------------------------------------------
 299 ##     0        Normal behaviour (Default)
 300 ##     1        Pretend CEC is not supported by TV
 301 ##
 302 #hdmi_ignore_cec=1
 303
 304 ################################################################################
 305 ##  Overscan Video Settings
 306 ################################################################################
 307
 308 ## overscan_left
 309 ##     Number of pixels to skip on left
 310 ##
 311 #overscan_left=0
 312
 313 ## overscan_right
 314 ##     Number of pixels to skip on right
 315 ##
 316 #overscan_right=0
 317
 318 ## overscan_top
 319 ##     Number of pixels to skip on top
 320 ##
 321 #overscan_top=0
 322
 323 ## overscan_bottom
 324 ##     Number of pixels to skip on bottom
 325 ##
 326 #overscan_bottom=0
 327
 328 ## disable_overscan
 329 ##     Set to 1 to disable overscan
 330 ##
 331 ##     Value    Description
 332 ##     -------------------------------------------------------------------------
 333 ##     0        Overscan Enabled (Default)
 334 ##     1        Overscan Disabled
 335 ##
 336 #disable_overscan=1
 337
 338 ################################################################################
 339 ##  Framebuffer Video Settings
 340 ################################################################################
 341
 342 ## framebuffer_width
 343 ##     Console framebuffer width in pixels. Default is display width minus
 344 ##     overscan.
 345 ##
 346 #framebuffer_width=0
 347
 348 ## framebuffer_height
 349 ##     Console framebuffer height in pixels. Default is display height minus
 350 ##     overscan.
 351 ##
 352 #framebuffer_height=0
 353
 354 ## framebuffer_depth
 355 ##     Console framebuffer depth in bits per pixel.
 356 ##
 357 ##     Value    Description
 358 ##     -------------------------------------------------------------------------
 359 ##     8        Valid, but default RGB palette makes an unreadable screen
 360 ##     16       (Default)
 361 ##     24       Looks better but has corruption issues as of 2012/06/15
 362 ##     32       Has no corruption issues but needs framebuffer_ignore_alpha=1
 363 ##              and shows the wrong colors as of 2012/06/15
 364 ##
 365 #framebuffer_depth=16
 366
 367 ## framebuffer_ignore_alpha
 368 ##     Set to 1 to disable alpha channel. Helps with 32bit.
 369 ##
 370 ##     Value    Description
 371 ##     -------------------------------------------------------------------------
 372 ##     0        Enable Alpha Channel (Default)
 373 ##     1        Disable Alpha Channel
 374 ##
 375 #framebuffer_ignore_alpha=0
 376
 377 ################################################################################
 378 ##  General Video Settings
 379 ################################################################################
 380
 381 ## display_rotate
 382 ##     Rotate the display clockwise or flip the display.
 383 ##     The 90 and 270 degrees rotation options require additional memory on GPU,
 384 ##     so won't work with the 16M GPU split.
 385 ##
 386 ##     Value    Description
 387 ##     -------------------------------------------------------------------------
 388 ##     0        0 degrees (Default)
 389 ##     1        90 degrees
 390 ##     2        180 degrees
 391 ##     3        270 degrees
 392 ##     0x10000  Horizontal flip
 393 ##     0x20000  Vertical flip
 394 ##
 395 #display_rotate=0
 396
 397 ################################################################################
 398 ##  Licensed Codecs
 399 ##
 400 ##  Hardware decoding of additional codecs can be enabled by purchasing a
 401 ##  license that is locked to the CPU serial number of your Raspberry Pi.
 402 ##
 403 ##  Up to 8 licenses per CODEC can be specified as a comma seperated list.
 404 ##
 405 ################################################################################
 406
 407 ## decode_MPG2
 408 ##     License key to allow hardware MPEG-2 decoding.
 409 ##
 410 #decode_MPG2=0x12345678
 411
 412 ## decode_WVC1
 413 ##     License key to allow hardware VC-1 decoding.
 414 ##
 415 #decode_WVC1=0x12345678
 416
 417 ################################################################################
 418 ##  Test Settings
 419 ################################################################################
 420
 421 ## test_mode
 422 ##     Enable test sound/image during boot for manufacturing test.
 423 ##
 424 ##     Value    Description
 425 ##     -------------------------------------------------------------------------
 426 ##     0        Disable Test Mod (Default)
 427 ##     1        Enable Test Mode
 428 ##
 429 #test_mode=0
 430
 431 ################################################################################
 432 ##  Memory Settings
 433 ################################################################################
 434
 435 ## disable_l2cache
 436 ##     Disable arm access to GPU's L2 cache. Needs corresponding L2 disabled
 437 ##     kernel.
 438 ##
 439 ##     Value    Description
 440 ##     -------------------------------------------------------------------------
 441 ##     0        Enable L2 Cache (Default)
 442 ##     1        Disable L2 cache
 443 ##
 444 #disable_l2cache=0
 445
 446 ## gpu_mem
 447 ##     GPU memory allocation in MB for all board revisions.
 448 ##
 449 ##     Default 64
 450 ##
 451 #gpu_mem=128
 452
 453 ## gpu_mem_256
 454 ##     GPU memory allocation in MB for 256MB board revision.
 455 ##     This option overrides gpu_mem.
 456 ##
 457 #gpu_mem_256=128
 458
 459 ## gpu_mem_512
 460 ##     GPU memory allocation in MB for 512MB board revision.
 461 ##     This option overrides gpu_mem.
 462 ##
 463 #gpu_mem_512=128
 464
 465 ## gpu_mem_1024
 466 ##     GPU memory allocation in MB for 1024MB board revision.
 467 ##     This option overrides gpu_mem.
 468 ##
 469 #gpu_mem_1024=128
 470
 471 ################################################################################
 472 ##  Boot Option Settings
 473 ################################################################################
 474
 475 ## disable_commandline_tags
 476 ##     Stop start.elf from filling in ATAGS (memory from 0x100) before
 477 ##     launching kernel
 478 ##
 479 disable_commandline_tags=1
 480
 481 ## cmdline (string)
 482 ##     Command line parameters. Can be used instead of cmdline.txt file
 483 ##
 484 #cmdline=""
 485
 486 ## kernel (string)
 487 ##     Alternative name to use when loading kernel.
 488 ##
 489 #kernel=""
 490
 491 ## kernel_address
 492 ##     Address to load kernel.img file at
 493 ##
 494 kernel_address=0x8000
 495
 496 ## ramfsfile (string)
 497 ##     ramfs file to load
 498 ##
 499 #ramfsfile=""
 500
 501 ## ramfsaddr
 502 ##     Address to load ramfs file at
 503 ##
 504 #ramfsaddr=0x00000000
 505
 506 ## initramfs (string address)
 507 ##     ramfs file and address to load it at (it's like ramfsfile+ramfsaddr in
 508 ##     one option).
 509 ##
 510 ##     NOTE: this option uses different syntax than all other options - you
 511 ##           should not use "=" character here.
 512 ##
 513 #initramfs initramf.gz 0x00800000
 514
 515 ## device_tree_address
 516 ##     Address to load device_tree at
 517 ##
 518 device_tree_address=0x100
 519
 520 ## init_uart_baud
 521 ##     Initial uart baud rate.
 522 ##
 523 ##     Default 115200
 524 ##
 525 init_uart_baud=115200
 526
 527 ## init_uart_clock
 528 ##     Initial uart clock.
 529 ##
 530 ##     Default 3000000 (3MHz)
 531 ##
 532 init_uart_clock=3000000
 533
 534 ## init_emmc_clock
 535 ##     Initial emmc clock, increasing this can speedup your SD-card.
 536 ##
 537 ##     Default 100000000 (100mhz)
 538 ##
 539 #init_emmc_clock=100000000
 540
 541 ## boot_delay
 542 ##     Wait for a given number of seconds in start.elf before loading
 543 ##     kernel.img.
 544 ##
 545 ##     delay = (1000 * boot_delay) + boot_delay_ms
 546 ##
 547 ##     Default 1
 548 ##
 549 #boot_delay=0
 550
 551 ## boot_delay_ms
 552 ##     Wait for a given number of milliseconds in start.elf before loading
 553 ##     kernel.img.
 554 ##
 555 ##     delay = (1000 * boot_delay) + boot_delay_ms
 556 ##
 557 ##     Default 0
 558 ##
 559 #boot_delay_ms=0
 560
 561 ## avoid_safe_mode
 562 ##     Adding a jumper between pins 5 & 6 of P1 enables a recovery Safe Mode.
 563 ##     If pins 5 & 6 are used for connecting to external devices (e.g. GPIO),
 564 ##     then this setting can be used to ensure Safe Mode is not triggered.
 565 ##
 566 ##     Value    Description
 567 ##     -------------------------------------------------------------------------
 568 ##     0        Respect Safe Mode input (Default)
 569 ##     1        Ignore Safe Mode input
 570 ##
 571 #avoid_safe_mode=1
 572
 573 ################################################################################
 574 ##  Overclocking Settings
 575 ##
 576 ##  ARM, SDRAM and GPU each have their own PLLs and can have unrelated
 577 ##  frequencies.
 578 ##
 579 ##  The GPU core, h264, v3d and isp share a PLL, so need to have related
 580 ##  frequencies.
 581 ##  pll_freq = floor(2400 / (2 * core_freq)) * (2 * core_freq)
 582 ##  gpu_freq = pll_freq / [even number]
 583 ##
 584 ##  The effective gpu_freq is automatically rounded to nearest even integer, so
 585 ##  asking for core_freq = 500 and gpu_freq = 300 will result in divisor of
 586 ##  2000/300 = 6.666 => 6 and so 333.33MHz.
 587 ##
 588 ##
 589 ##  Standard Profiles:
 590 ##                  arm_freq    core_freq    sdram_freq    over_voltage
 591 ##     -------------------------------------------------------------------------
 592 ##     None         700         250          400           0
 593 ##     Modest       800         300          400           0
 594 ##     Medium       900         333          450           2
 595 ##     High         950         450          450           6
 596 ##     Turbo        1000        500          500           6
 597 ##
 598 ################################################################################
 599
 600 ## force_turbo
 601 ##     Control the kernel "ondemand" governor. It has no effect if no overclock
 602 ##     settings are specified.
 603 ##
 604 ##     Value    Description
 605 ##     -------------------------------------------------------------------------
 606 ##     0        Enable dynamic clocks and voltage for the ARM core, GPU core and
 607 ##              SDRAM (Default).
 608 ##              Overclocking of h264_freq, v3d_freq and isp_freq is ignored.
 609 ##     1        Disable dynamic clocks and voltage for the ARM core, GPU core
 610 ##              and SDRAM.
 611 ##              Overclocking of h264_freq, v3d_freq and isp_freq is allowed.
 612 ##
 613 #force_turbo=0
 614
 615 ## initial_turbo
 616 ##     Enables turbo mode from boot for the given value in seconds (up to 60)
 617 ##     or until cpufreq sets a frequency. Can help with sdcard corruption if
 618 ##     overclocked.
 619 ##
 620 ##     Default 0
 621 ##
 622 #initial_turbo=0
 623
 624 ## temp_limit
 625 ##     Overheat protection. Sets clocks and voltages to default when the SoC
 626 ##     reaches this Celsius value.
 627 ##     Setting this higher than default voids warranty.
 628 ##
 629 ##     Default 85
 630 ##
 631 #temp_limit=85
 632
 633 ## arm_freq
 634 ##     Frequency of ARM in MHz.
 635 ##
 636 ##     Default 700.
 637 ##
 638 #arm_freq=700
 639
 640 ## arm_freq_min
 641 ##     Minimum frequency of ARM in MHz (used for dynamic clocking).
 642 ##
 643 ##     Default 700.
 644 ##
 645 #arm_freq_min=700
 646
 647 ## gpu_freq
 648 ##     Sets core_freq, h264_freq, isp_freq, v3d_freq together.
 649 ##
 650 ##     Default 250.
 651 ##
 652 #gpu_freq=250
 653
 654 ## core_freq
 655 ##     Frequency of GPU processor core in MHz. It has an impact on ARM
 656 ##     performance since it drives L2 cache.
 657 ##
 658 ##     Default 250.
 659 ##
 660 #core_freq=250
 661
 662 ## core_freq_min
 663 ##     Minimum frequency of GPU processor core in MHz (used for dynamic
 664 ##     clocking). It has an impact on ARM performance since it drives L2 cache.
 665 ##
 666 ##     Default 250.
 667 ##
 668 #core_freq_min=250
 669
 670 ## h264_freq
 671 ##     Frequency of hardware video block in MHz.
 672 ##
 673 ##     Default 250.
 674 ##
 675 #h264_freq=250
 676
 677 ## isp_freq
 678 ##     Frequency of image sensor pipeline block in MHz.
 679 ##
 680 ##     Default 250.
 681 ##
 682 #isp_freq=250
 683
 684 ## v3d_freq
 685 ##     Frequency of 3D block in MHz.
 686 ##
 687 ##     Default 250.
 688 ##
 689 #v3d_freq=250
 690
 691 ## sdram_freq
 692 ##     Frequency of SDRAM in MHz.
 693 ##
 694 ##     Default 400.
 695 ##
 696 #sdram_freq=400
 697
 698 ## sdram_freq_min
 699 ##     Minimum frequency of SDRAM in MHz (used for dynamic clocking).
 700 ##
 701 ##     Default 400.
 702 ##
 703 #sdram_freq_min=400
 704
 705 ## avoid_pwm_pll
 706 ##     Unlink core_freq from the rest of the gpu. Analog audio should still
 707 ##     work, but from a fractional divider, so lower quality.
 708 ##
 709 ##     Value    Description
 710 ##     -------------------------------------------------------------------------
 711 ##     0        Linked core_freq (Default)
 712 ##     1        Unlinked core_freq
 713 ##
 714 #avoid_pwm_pll=1
 715
 716 ################################################################################
 717 ##  Voltage Settings
 718 ################################################################################
 719
 720 ## current_limit_override
 721 ##     Disables SMPS current limit protection. Can help if you are currently
 722 ##     hitting a reboot failure when overclocking too high.
 723 ##
 724 #current_limit_override=0x5A000020
 725
 726 ## over_voltage
 727 ##     ARM/GPU core voltage adjust.
 728 ##
 729 ##     Value    Description
 730 ##     -------------------------------------------------------------------------
 731 ##     -16      0.8   V
 732 ##     -15      0.825 V
 733 ##     -14      0.85  V
 734 ##     -13      0.875 V
 735 ##     -12      0.9   V
 736 ##     -11      0.925 V
 737 ##     -10      0.95  V
 738 ##     -9       0.975 V
 739 ##     -8       1.0   V
 740 ##     -7       1.025 V
 741 ##     -6       1.05  V
 742 ##     -5       1.075 V
 743 ##     -4       1.1   V
 744 ##     -3       1.125 V
 745 ##     -2       1.15  V
 746 ##     -1       1.175 V
 747 ##     0        1.2   V (Default)
 748 ##     1        1.225 V
 749 ##     2        1.25  V
 750 ##     3        1.275 V
 751 ##     4        1.3   V
 752 ##     5        1.325 V
 753 ##     6        1.35  V
 754 ##     7        1.375 V (requires force_turbo=1)
 755 ##     8        1.4   V (requires force_turbo=1)
 756 ##
 757 #over_voltage=0
 758
 759 ## over_voltage_min
 760 ##     Minimum ARM/GPU core voltage adjust (used for dynamic clocking).
 761 ##
 762 ##     Value    Description
 763 ##     -------------------------------------------------------------------------
 764 ##     -16      0.8   V
 765 ##     -15      0.825 V
 766 ##     -14      0.85  V
 767 ##     -13      0.875 V
 768 ##     -12      0.9   V
 769 ##     -11      0.925 V
 770 ##     -10      0.95  V
 771 ##     -9       0.975 V
 772 ##     -8       1.0   V
 773 ##     -7       1.025 V
 774 ##     -6       1.05  V
 775 ##     -5       1.075 V
 776 ##     -4       1.1   V
 777 ##     -3       1.125 V
 778 ##     -2       1.15  V
 779 ##     -1       1.175 V
 780 ##     0        1.2   V (Default)
 781 ##     1        1.225 V
 782 ##     2        1.25  V
 783 ##     3        1.275 V
 784 ##     4        1.3   V
 785 ##     5        1.325 V
 786 ##     6        1.35  V
 787 ##     7        1.375 V (requires force_turbo=1)
 788 ##     8        1.4   V (requires force_turbo=1)
 789 ##
 790 #over_voltage_min=0
 791
 792 ## over_voltage_sdram
 793 ##     Sets over_voltage_sdram_c, over_voltage_sdram_i, over_voltage_sdram_p
 794 ##     together
 795 ##
 796 ##     Value    Description
 797 ##     -------------------------------------------------------------------------
 798 ##     -16      0.8   V
 799 ##     -15      0.825 V
 800 ##     -14      0.85  V
 801 ##     -13      0.875 V
 802 ##     -12      0.9   V
 803 ##     -11      0.925 V
 804 ##     -10      0.95  V
 805 ##     -9       0.975 V
 806 ##     -8       1.0   V
 807 ##     -7       1.025 V
 808 ##     -6       1.05  V
 809 ##     -5       1.075 V
 810 ##     -4       1.1   V
 811 ##     -3       1.125 V
 812 ##     -2       1.15  V
 813 ##     -1       1.175 V
 814 ##     0        1.2   V (Default)
 815 ##     1        1.225 V
 816 ##     2        1.25  V
 817 ##     3        1.275 V
 818 ##     4        1.3   V
 819 ##     5        1.325 V
 820 ##     6        1.35  V
 821 ##     7        1.375 V
 822 ##     8        1.4   V
 823 ##
 824 #over_voltage_sdram=0
 825
 826 ## over_voltage_sdram_c
 827 ##     SDRAM controller voltage adjust.
 828 ##
 829 ##     Value    Description
 830 ##     -------------------------------------------------------------------------
 831 ##     -16      0.8   V
 832 ##     -15      0.825 V
 833 ##     -14      0.85  V
 834 ##     -13      0.875 V
 835 ##     -12      0.9   V
 836 ##     -11      0.925 V
 837 ##     -10      0.95  V
 838 ##     -9       0.975 V
 839 ##     -8       1.0   V
 840 ##     -7       1.025 V
 841 ##     -6       1.05  V
 842 ##     -5       1.075 V
 843 ##     -4       1.1   V
 844 ##     -3       1.125 V
 845 ##     -2       1.15  V
 846 ##     -1       1.175 V
 847 ##     0        1.2   V (Default)
 848 ##     1        1.225 V
 849 ##     2        1.25  V
 850 ##     3        1.275 V
 851 ##     4        1.3   V
 852 ##     5        1.325 V
 853 ##     6        1.35  V
 854 ##     7        1.375 V
 855 ##     8        1.4   V
 856 ##
 857 #over_voltage_sdram_c=0
 858
 859 ## over_voltage_sdram_i
 860 ##     SDRAM I/O voltage adjust.
 861 ##
 862 ##     Value    Description
 863 ##     -------------------------------------------------------------------------
 864 ##     -16      0.8   V
 865 ##     -15      0.825 V
 866 ##     -14      0.85  V
 867 ##     -13      0.875 V
 868 ##     -12      0.9   V
 869 ##     -11      0.925 V
 870 ##     -10      0.95  V
 871 ##     -9       0.975 V
 872 ##     -8       1.0   V
 873 ##     -7       1.025 V
 874 ##     -6       1.05  V
 875 ##     -5       1.075 V
 876 ##     -4       1.1   V
 877 ##     -3       1.125 V
 878 ##     -2       1.15  V
 879 ##     -1       1.175 V
 880 ##     0        1.2   V (Default)
 881 ##     1        1.225 V
 882 ##     2        1.25  V
 883 ##     3        1.275 V
 884 ##     4        1.3   V
 885 ##     5        1.325 V
 886 ##     6        1.35  V
 887 ##     7        1.375 V
 888 ##     8        1.4   V
 889 ##
 890 #over_voltage_sdram_i=0
 891
 892 ## over_voltage_sdram_p
 893 ##     SDRAM phy voltage adjust.
 894 ##
 895 ##     Value    Description
 896 ##     -------------------------------------------------------------------------
 897 ##     -16      0.8   V
 898 ##     -15      0.825 V
 899 ##     -14      0.85  V
 900 ##     -13      0.875 V
 901 ##     -12      0.9   V
 902 ##     -11      0.925 V
 903 ##     -10      0.95  V
 904 ##     -9       0.975 V
 905 ##     -8       1.0   V
 906 ##     -7       1.025 V
 907 ##     -6       1.05  V
 908 ##     -5       1.075 V
 909 ##     -4       1.1   V
 910 ##     -3       1.125 V
 911 ##     -2       1.15  V
 912 ##     -1       1.175 V
 913 ##     0        1.2   V (Default)
 914 ##     1        1.225 V
 915 ##     2        1.25  V
 916 ##     3        1.275 V
 917 ##     4        1.3   V
 918 ##     5        1.325 V
 919 ##     6        1.35  V
 920 ##     7        1.375 V
 921 ##     8        1.4   V
 922 ##
 923 #over_voltage_sdram_p=0
 924
 925 ################################################################################
 926 ##  Device Tree Settings
 927 ################################################################################
 928
 929 dtparam=random=on,watchdog=on,audio=on,i2c0=on,i2c1=on,spi=on
 930
 931 #dtoverlay=hifiberry-amp-overlay
 932 #dtoverlay=hifiberry-dac-overlay
 933 #dtoverlay=hifiberry-dacplus-overlay
 934 #dtoverlay=hifiberry-digi-overlay
 935 #dtoverlay=iqaudio-dac-overlay
 936 #dtoverlay=iqaudio-dacplus-overlay
 937 #dtoverlay=raspidac3-overlay
 938 #dtoverlay=rpi-proto-overlay