brcm2708: add linux 4.19 support

Boot tested on Raspberry Pi B+ (BCM2708) and Raspberry Pi 2 (BCM2709)

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

3 files changed, 7 insertions, 960 deletions

diff --git a/target/linux/brcm2708/image/Makefile b/target/linux/brcm2708/image/Makefile
index cd00d7f394..89cd134091 100644
--- a/target/linux/brcm2708/image/Makefile
+++ b/target/linux/brcm2708/image/Makefile
@@ -58,7 +58,7 @@ endef
 
 define Device/rpi
   DEVICE_TITLE := Raspberry Pi B/B+/CM/Zero/ZeroW
-  DEVICE_DTS := bcm2708-rpi-b bcm2708-rpi-b-plus bcm2708-rpi-cm bcm2708-rpi-0-w
+  DEVICE_DTS := bcm2708-rpi-b bcm2708-rpi-b-plus bcm2708-rpi-cm bcm2708-rpi-zero bcm2708-rpi-zero-w
   SUPPORTED_DEVICES := \
 	rpi-b rpi-b-plus rpi-cm rpi-zero rpi-zero-w \
 	raspberrypi,model-b raspberrypi,model-b-plus raspberrypi,model-b-rev2 \
@@ -86,8 +86,8 @@ endif
 
 define Device/rpi-3
   KERNEL_IMG := kernel8.img
-  DEVICE_TITLE := Raspberry Pi 3B/3B+
-  DEVICE_DTS := broadcom/bcm2710-rpi-3-b broadcom/bcm2710-rpi-3-b-plus
+  DEVICE_TITLE := Raspberry Pi 3B/3B+/3CM
+  DEVICE_DTS := broadcom/bcm2710-rpi-3-b broadcom/bcm2710-rpi-3-b-plus broadcom/bcm2710-rpi-cm3
   SUPPORTED_DEVICES := \
 	rpi-3-b rpi-3-b-plus \
 	raspberrypi,3-model-b raspberrypi,3-model-b-plus \
diff --git a/target/linux/brcm2708/image/cmdline.txt b/target/linux/brcm2708/image/cmdline.txt
index c1099afb00..d9b7d867a7 100644
--- a/target/linux/brcm2708/image/cmdline.txt
+++ b/target/linux/brcm2708/image/cmdline.txt
@@ -1 +1 @@
-dwc_otg.lpm_enable=0 console=serial0,115200 kgdboc=serial0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=squashfs,ext4 rootwait
+console=serial0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=squashfs,ext4 rootwait
diff --git a/target/linux/brcm2708/image/config.txt b/target/linux/brcm2708/image/config.txt
index 329aaccc53..0b963a99ae 100644
--- a/target/linux/brcm2708/image/config.txt
+++ b/target/linux/brcm2708/image/config.txt
@@ -1,961 +1,8 @@
 ################################################################################
-##  Raspberry Pi Configuration Settings
-##
-##  Revision 14, 2012/10/22
-##
-##  Details taken from the eLinux wiki
-##  For up-to-date information please refer to wiki page.
-##
-##  Wiki Location : http://elinux.org/RPi_config.txt
-##
-##
-##  Description:
-##    Details of each setting are described with each section that begins with
-##    a double hashed comment ('##')
-##    It is up to the user to remove the single hashed comment ('#') from each
-##    option they want to enable, and to set the specific value of that option.
-##
-##  WARNING: Setting the following combination of parameters will set a
-##  permanent bit within the SOC and your warranty is void.
-##    over_voltage>0, and at least one of the following:
-##      force_turbo=1
-##      current_limit_override=0x5A000020
-##      temp_limit>85
-##
-##  Overclock settings will be disabled at runtime if the SoC reaches temp_limit
-##
+# Bootloader configuration - config.txt
 ################################################################################
 
 ################################################################################
-##  Standard Definition Video Settings
+# For overclocking and various other settings, see:
+# https://www.raspberrypi.org/documentation/configuration/config-txt/README.md
 ################################################################################
-
-## sdtv_mode
-##     defines the TV standard for composite output
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Normal NTSC (Default)
-##     1        Japanese version of NTSC - no pedestal
-##     2        Normal PAL
-##     3        Brazilian version of PAL - 525/60 rather than 625/50, different
-##              subcarrier
-##
-#sdtv_mode=0
-
-## sdtv_aspect
-##     defines the aspect ratio for composite output
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     1        4:3 (Default)
-##     2        14:9
-##     3        16:9
-##
-#sdtv_aspect=1
-
-## sdtv_disable_colourburst
-##     Disables colour burst on composite output. The picture will be
-##     monochrome, but possibly sharper
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Colour burst is enabled (Default)
-##     1        Colour burst is disabled
-##
-#sdtv_disable_colourburst=1
-
-################################################################################
-##  High Definition Video Settings
-################################################################################
-
-## hdmi_safe
-##     Use "safe mode" settings to try to boot with maximum hdmi compatibility.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Disabled (Default)
-##     1        Enabled (this does: hdmi_force_hotplug=1, config_hdmi_boost=4,
-##                                  hdmi_group=1, hdmi_mode=1,
-##                                  disable_overscan=0)
-##
-#hdmi_safe=1
-
-## hdmi_force_hotplug
-##     Pretends HDMI hotplug signal is asserted so it appears a HDMI display
-##     is attached
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Disabled (Default)
-##     1        Use HDMI mode even if no HDMI monitor is detected
-##
-#hdmi_force_hotplug=1
-
-## hdmi_ignore_hotplug
-##     Pretends HDMI hotplug signal is not asserted so it appears a HDMI
-##     display is not attached
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Disabled (Default)
-##     1        Use composite mode even if HDMI monitor is detected
-##
-#hdmi_ignore_hotplug=1 
-
-## hdmi_drive
-##     chooses between HDMI and DVI modes
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     1        Normal DVI mode (No sound)
-##     2        Normal HDMI mode (Sound will be sent if supported and enabled)
-##
-#hdmi_drive=2
-
-## hdmi_ignore_edid
-##     Enables the ignoring of EDID/display data
-##
-#hdmi_ignore_edid=0xa5000080
-
-## hdmi_edid_file
-##     Read the EDID data from the edid.dat file instead of from the attached
-##     device
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Read EDID data from attached device (Default)
-##     1        Read EDID data from edid.txt file
-##
-#hdmi_edid_file=1
-
-## hdmi_force_edid_audio
-##     Pretends all audio formats are supported by display, allowing
-##     passthrough of DTS/AC3 even when not reported as supported.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Use EDID provided values (Default)
-##     1        Pretend all audio formats are supported
-##
-#hdmi_force_edid_audio=1
-
-## avoid_edid_fuzzy_match
-##     Avoid fuzzy matching of modes described in edid.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Use fuzzy matching (Default)
-##     1        Avoid fuzzy matching
-##
-#avoid_edid_fuzzy_match=1
-
-## hdmi_group
-##     Defines the HDMI type
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Use the preferred group reported by the edid (Default)
-##     1        CEA
-##     2        DMT
-##
-#hdmi_group=1
-
-## hdmi_mode
-##     defines screen resolution in CEA or DMT format
-##
-##     H means 16:9 variant (of a normally 4:3 mode).
-##     2x means pixel doubled (i.e. higher clock rate, with each pixel repeated
-##                                  twice)
-##     4x means pixel quadrupled (i.e. higher clock rate, with each pixel
-##                                     repeated four times)
-##     reduced blanking means fewer bytes are used for blanking within the data
-##                      stream (i.e. lower clock rate, with fewer wasted bytes)
-##
-##     Value    hdmi_group=CEA                  hdmi_group=DMT
-##     -------------------------------------------------------------------------
-##     1        VGA                             640x350   85Hz
-##     2        480p  60Hz                      640x400   85Hz
-##     3        480p  60Hz  H                   720x400   85Hz
-##     4        720p  60Hz                      640x480   60Hz
-##     5        1080i 60Hz                      640x480   72Hz
-##     6        480i  60Hz                      640x480   75Hz
-##     7        480i  60Hz  H                   640x480   85Hz
-##     8        240p  60Hz                      800x600   56Hz
-##     9        240p  60Hz  H                   800x600   60Hz
-##     10       480i  60Hz  4x                  800x600   72Hz
-##     11       480i  60Hz  4x H                800x600   75Hz
-##     12       240p  60Hz  4x                  800x600   85Hz
-##     13       240p  60Hz  4x H                800x600   120Hz
-##     14       480p  60Hz  2x                  848x480   60Hz
-##     15       480p  60Hz  2x H                1024x768  43Hz  DO NOT USE
-##     16       1080p 60Hz                      1024x768  60Hz
-##     17       576p  50Hz                      1024x768  70Hz
-##     18       576p  50Hz  H                   1024x768  75Hz
-##     19       720p  50Hz                      1024x768  85Hz
-##     20       1080i 50Hz                      1024x768  120Hz
-##     21       576i  50Hz                      1152x864  75Hz
-##     22       576i  50Hz  H                   1280x768        reduced blanking
-##     23       288p  50Hz                      1280x768  60Hz
-##     24       288p  50Hz  H                   1280x768  75Hz
-##     25       576i  50Hz  4x                  1280x768  85Hz
-##     26       576i  50Hz  4x H                1280x768  120Hz reduced blanking
-##     27       288p  50Hz  4x                  1280x800        reduced blanking
-##     28       288p  50Hz  4x H                1280x800  60Hz
-##     29       576p  50Hz  2x                  1280x800  75Hz
-##     30       576p  50Hz  2x H                1280x800  85Hz
-##     31       1080p 50Hz                      1280x800  120Hz reduced blanking
-##     32       1080p 24Hz                      1280x960  60Hz
-##     33       1080p 25Hz                      1280x960  85Hz
-##     34       1080p 30Hz                      1280x960  120Hz reduced blanking
-##     35       480p  60Hz  4x                  1280x1024 60Hz
-##     36       480p  60Hz  4x H                1280x1024 75Hz
-##     37       576p  50Hz  4x                  1280x1024 85Hz
-##     38       576p  50Hz  4x H                1280x1024 120Hz reduced blanking
-##     39       1080i 50Hz  reduced blanking    1360x768  60Hz
-##     40       1080i 100Hz                     1360x768  120Hz reduced blanking
-##     41       720p  100Hz                     1400x1050       reduced blanking
-##     42       576p  100Hz                     1400x1050 60Hz
-##     43       576p  100Hz H                   1400x1050 75Hz
-##     44       576i  100Hz                     1400x1050 85Hz
-##     45       576i  100Hz H                   1400x1050 120Hz reduced blanking
-##     46       1080i 120Hz                     1440x900        reduced blanking
-##     47       720p  120Hz                     1440x900  60Hz
-##     48       480p  120Hz                     1440x900  75Hz
-##     49       480p  120Hz H                   1440x900  85Hz
-##     50       480i  120Hz                     1440x900  120Hz reduced blanking
-##     51       480i  120Hz H                   1600x1200 60Hz
-##     52       576p  200Hz                     1600x1200 65Hz
-##     53       576p  200Hz H                   1600x1200 70Hz
-##     54       576i  200Hz                     1600x1200 75Hz
-##     55       576i  200Hz H                   1600x1200 85Hz
-##     56       480p  240Hz                     1600x1200 120Hz reduced blanking
-##     57       480p  240Hz H                   1680x1050       reduced blanking
-##     58       480i  240Hz                     1680x1050 60Hz
-##     59       480i  240Hz H                   1680x1050 75Hz
-##     60                                       1680x1050 85Hz
-##     61                                       1680x1050 120Hz reduced blanking
-##     62                                       1792x1344 60Hz
-##     63                                       1792x1344 75Hz
-##     64                                       1792x1344 120Hz reduced blanking
-##     65                                       1856x1392 60Hz
-##     66                                       1856x1392 75Hz
-##     67                                       1856x1392 120Hz reduced blanking
-##     68                                       1920x1200       reduced blanking
-##     69                                       1920x1200 60Hz
-##     70                                       1920x1200 75Hz
-##     71                                       1920x1200 85Hz
-##     72                                       1920x1200 120Hz reduced blanking
-##     73                                       1920x1440 60Hz
-##     74                                       1920x1440 75Hz
-##     75                                       1920x1440 120Hz reduced blanking
-##     76                                       2560x1600       reduced blanking
-##     77                                       2560x1600 60Hz
-##     78                                       2560x1600 75Hz
-##     79                                       2560x1600 85Hz
-##     80                                       2560x1600 120Hz reduced blanking
-##     81                                       1366x768  60Hz
-##     82                                       1080p     60Hz
-##     83                                       1600x900        reduced blanking
-##     84                                       2048x1152       reduced blanking
-##     85                                       720p      60Hz
-##     86                                       1366x768        reduced blanking
-##
-#hdmi_mode=1
-
-## config_hdmi_boost
-##     configure the signal strength of the HDMI interface.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        (Default)
-##     1
-##     2
-##     3
-##     4        Try if you have interference issues with HDMI
-##     5
-##     6
-##     7        Maximum
-##
-#config_hdmi_boost=0
-
-## hdmi_ignore_cec_init
-##     Doesn't sent initial active source message.  Avoids bringing
-##     (CEC enabled) TV out of standby and channel switch when rebooting.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Normal behaviour (Default)
-##     1        Doesn't sent initial active source message
-##
-#hdmi_ignore_cec_init=1
-
-## hdmi_ignore_cec
-##     Pretends CEC is not supported at all by TV.
-##     No CEC functions will be supported.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Normal behaviour (Default)
-##     1        Pretend CEC is not supported by TV
-##
-#hdmi_ignore_cec=1
-
-################################################################################
-##  Overscan Video Settings
-################################################################################
-
-## overscan_left
-##     Number of pixels to skip on left
-##
-#overscan_left=0
-
-## overscan_right
-##     Number of pixels to skip on right
-##
-#overscan_right=0
-
-## overscan_top
-##     Number of pixels to skip on top
-##
-#overscan_top=0
-
-## overscan_bottom
-##     Number of pixels to skip on bottom
-##
-#overscan_bottom=0
-
-## disable_overscan
-##     Set to 1 to disable overscan
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Overscan Enabled (Default)
-##     1        Overscan Disabled
-##
-#disable_overscan=1
-
-################################################################################
-##  Framebuffer Video Settings
-################################################################################
-
-## framebuffer_width
-##     Console framebuffer width in pixels. Default is display width minus
-##     overscan.
-##
-#framebuffer_width=0
-
-## framebuffer_height
-##     Console framebuffer height in pixels. Default is display height minus
-##     overscan.
-##
-#framebuffer_height=0
-
-## framebuffer_depth
-##     Console framebuffer depth in bits per pixel.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     8        Valid, but default RGB palette makes an unreadable screen
-##     16       (Default)
-##     24       Looks better but has corruption issues as of 2012/06/15
-##     32       Has no corruption issues but needs framebuffer_ignore_alpha=1
-##              and shows the wrong colors as of 2012/06/15
-##
-#framebuffer_depth=16
-
-## framebuffer_ignore_alpha
-##     Set to 1 to disable alpha channel. Helps with 32bit.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Enable Alpha Channel (Default)
-##     1        Disable Alpha Channel
-##
-#framebuffer_ignore_alpha=0
-
-################################################################################
-##  General Video Settings
-################################################################################
-
-## display_rotate
-##     Rotate the display clockwise or flip the display.
-##     The 90 and 270 degrees rotation options require additional memory on GPU,
-##     so won't work with the 16M GPU split.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        0 degrees (Default)
-##     1        90 degrees
-##     2        180 degrees
-##     3        270 degrees
-##     0x10000  Horizontal flip
-##     0x20000  Vertical flip
-##
-#display_rotate=0
-
-################################################################################
-##  Licensed Codecs
-##
-##  Hardware decoding of additional codecs can be enabled by purchasing a
-##  license that is locked to the CPU serial number of your Raspberry Pi.
-##
-##  Up to 8 licenses per CODEC can be specified as a comma seperated list.
-##
-################################################################################
-
-## decode_MPG2
-##     License key to allow hardware MPEG-2 decoding.
-##
-#decode_MPG2=0x12345678
-
-## decode_WVC1
-##     License key to allow hardware VC-1 decoding.
-##
-#decode_WVC1=0x12345678
-
-################################################################################
-##  Test Settings
-################################################################################
-
-## test_mode
-##     Enable test sound/image during boot for manufacturing test.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Disable Test Mod (Default)
-##     1        Enable Test Mode
-##
-#test_mode=0
-
-################################################################################
-##  Memory Settings
-################################################################################
-
-## disable_l2cache
-##     Disable arm access to GPU's L2 cache. Needs corresponding L2 disabled
-##     kernel.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Enable L2 Cache (Default)
-##     1        Disable L2 cache
-##
-#disable_l2cache=0
-
-## gpu_mem
-##     GPU memory allocation in MB for all board revisions.
-##
-##     Default 64
-##
-#gpu_mem=128
-
-## gpu_mem_256
-##     GPU memory allocation in MB for 256MB board revision.
-##     This option overrides gpu_mem.
-##
-#gpu_mem_256=128
-
-## gpu_mem_512
-##     GPU memory allocation in MB for 512MB board revision.
-##     This option overrides gpu_mem.
-##
-#gpu_mem_512=128
-
-## gpu_mem_1024
-##     GPU memory allocation in MB for 1024MB board revision.
-##     This option overrides gpu_mem.
-##
-#gpu_mem_1024=128
-
-################################################################################
-##  Boot Option Settings
-################################################################################
-
-## disable_commandline_tags
-##     Stop start.elf from filling in ATAGS (memory from 0x100) before
-##     launching kernel
-##
-#disable_commandline_tags=2
-
-## enable_uart
-##     Enables or disables uart pin multiplexing
-##     Raspberry Pi 1/2: if unset, uart is enabled by default
-##     Raspberry Pi 3: if unset uart is disabled by default
-##
-enable_uart=1
-
-## cmdline (string)
-##     Command line parameters. Can be used instead of cmdline.txt file
-##
-#cmdline=""
-
-## kernel (string)
-##     Alternative name to use when loading kernel.
-##
-#kernel=""
-
-## kernel_address
-##     Address to load kernel.img file at
-##
-#kernel_address=0x8000
-
-## ramfsfile (string)
-##     ramfs file to load
-##
-#ramfsfile=""
-
-## ramfsaddr
-##     Address to load ramfs file at
-##
-#ramfsaddr=0x00000000
-
-## initramfs (string address)
-##     ramfs file and address to load it at (it's like ramfsfile+ramfsaddr in
-##     one option).
-##
-##     NOTE: this option uses different syntax than all other options - you
-##           should not use "=" character here.
-##
-#initramfs initramf.gz 0x00800000
-
-## device_tree_address
-##     Address to load device_tree at
-##
-#device_tree_address=0x100
-
-## init_uart_baud
-##     Initial uart baud rate.
-##
-##     Default 115200
-##
-#init_uart_baud=115200
-
-## init_uart_clock
-##     Initial uart clock.
-##
-##     Default 3000000 (3MHz)
-##
-#init_uart_clock=3000000
-
-## init_emmc_clock
-##     Initial emmc clock, increasing this can speedup your SD-card.
-##
-##     Default 100000000 (100mhz)
-##
-#init_emmc_clock=100000000
-
-## boot_delay
-##     Wait for a given number of seconds in start.elf before loading
-##     kernel.img.
-##
-##     delay = (1000 * boot_delay) + boot_delay_ms
-##
-##     Default 1
-##
-#boot_delay=0
-
-## boot_delay_ms
-##     Wait for a given number of milliseconds in start.elf before loading
-##     kernel.img.
-##
-##     delay = (1000 * boot_delay) + boot_delay_ms
-##
-##     Default 0
-##
-#boot_delay_ms=0
-
-## avoid_safe_mode
-##     Adding a jumper between pins 5 & 6 of P1 enables a recovery Safe Mode.
-##     If pins 5 & 6 are used for connecting to external devices (e.g. GPIO),
-##     then this setting can be used to ensure Safe Mode is not triggered.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Respect Safe Mode input (Default)
-##     1        Ignore Safe Mode input
-##
-#avoid_safe_mode=1
-
-################################################################################
-##  Overclocking Settings
-##
-##  ARM, SDRAM and GPU each have their own PLLs and can have unrelated
-##  frequencies.
-##
-##  The GPU core, h264, v3d and isp share a PLL, so need to have related
-##  frequencies.
-##  pll_freq = floor(2400 / (2 * core_freq)) * (2 * core_freq)
-##  gpu_freq = pll_freq / [even number]
-##
-##  The effective gpu_freq is automatically rounded to nearest even integer, so
-##  asking for core_freq = 500 and gpu_freq = 300 will result in divisor of
-##  2000/300 = 6.666 => 6 and so 333.33MHz.
-##
-##
-##  Standard Profiles:
-##                  arm_freq    core_freq    sdram_freq    over_voltage
-##     -------------------------------------------------------------------------
-##     None         700         250          400           0
-##     Modest       800         300          400           0
-##     Medium       900         333          450           2
-##     High         950         450          450           6
-##     Turbo        1000        500          500           6
-##
-################################################################################
-
-## force_turbo
-##     Control the kernel "ondemand" governor. It has no effect if no overclock
-##     settings are specified.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Enable dynamic clocks and voltage for the ARM core, GPU core and
-##              SDRAM (Default).
-##              Overclocking of h264_freq, v3d_freq and isp_freq is ignored.
-##     1        Disable dynamic clocks and voltage for the ARM core, GPU core
-##              and SDRAM.
-##              Overclocking of h264_freq, v3d_freq and isp_freq is allowed.
-##
-#force_turbo=0
-
-## initial_turbo
-##     Enables turbo mode from boot for the given value in seconds (up to 60)
-##     or until cpufreq sets a frequency. Can help with sdcard corruption if
-##     overclocked.
-##
-##     Default 0
-##
-#initial_turbo=0
-
-## temp_limit
-##     Overheat protection. Sets clocks and voltages to default when the SoC
-##     reaches this Celsius value.
-##     Setting this higher than default voids warranty.
-##
-##     Default 85
-##
-#temp_limit=85
-
-## arm_freq
-##     Frequency of ARM in MHz.
-##
-##     Default 700.
-##
-#arm_freq=700
-
-## arm_freq_min
-##     Minimum frequency of ARM in MHz (used for dynamic clocking).
-##
-##     Default 700.
-##
-#arm_freq_min=700
-
-## gpu_freq
-##     Sets core_freq, h264_freq, isp_freq, v3d_freq together.
-##
-##     Default 250.
-##
-#gpu_freq=250
-
-## core_freq
-##     Frequency of GPU processor core in MHz. It has an impact on ARM
-##     performance since it drives L2 cache.
-##
-##     Default 250.
-##
-#core_freq=250
-
-## core_freq_min
-##     Minimum frequency of GPU processor core in MHz (used for dynamic
-##     clocking). It has an impact on ARM performance since it drives L2 cache.
-##
-##     Default 250.
-##
-#core_freq_min=250
-
-## h264_freq
-##     Frequency of hardware video block in MHz.
-##
-##     Default 250.
-##
-#h264_freq=250
-
-## isp_freq
-##     Frequency of image sensor pipeline block in MHz.
-##
-##     Default 250.
-##
-#isp_freq=250
-
-## v3d_freq
-##     Frequency of 3D block in MHz.
-##
-##     Default 250.
-##
-#v3d_freq=250
-
-## sdram_freq
-##     Frequency of SDRAM in MHz.
-##
-##     Default 400.
-##
-#sdram_freq=400
-
-## sdram_freq_min
-##     Minimum frequency of SDRAM in MHz (used for dynamic clocking).
-##
-##     Default 400.
-##
-#sdram_freq_min=400
-
-## avoid_pwm_pll
-##     Unlink core_freq from the rest of the gpu. Analog audio should still
-##     work, but from a fractional divider, so lower quality.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     0        Linked core_freq (Default)
-##     1        Unlinked core_freq
-##
-#avoid_pwm_pll=1
-
-################################################################################
-##  Voltage Settings
-################################################################################
-
-## current_limit_override
-##     Disables SMPS current limit protection. Can help if you are currently
-##     hitting a reboot failure when overclocking too high.
-##
-#current_limit_override=0x5A000020
-
-## over_voltage
-##     ARM/GPU core voltage adjust.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     -16      0.8   V
-##     -15      0.825 V
-##     -14      0.85  V
-##     -13      0.875 V
-##     -12      0.9   V
-##     -11      0.925 V
-##     -10      0.95  V
-##     -9       0.975 V
-##     -8       1.0   V
-##     -7       1.025 V
-##     -6       1.05  V
-##     -5       1.075 V
-##     -4       1.1   V
-##     -3       1.125 V
-##     -2       1.15  V
-##     -1       1.175 V
-##     0        1.2   V (Default)
-##     1        1.225 V
-##     2        1.25  V
-##     3        1.275 V
-##     4        1.3   V
-##     5        1.325 V
-##     6        1.35  V
-##     7        1.375 V (requires force_turbo=1)
-##     8        1.4   V (requires force_turbo=1)
-##
-#over_voltage=0
-
-## over_voltage_min
-##     Minimum ARM/GPU core voltage adjust (used for dynamic clocking).
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     -16      0.8   V
-##     -15      0.825 V
-##     -14      0.85  V
-##     -13      0.875 V
-##     -12      0.9   V
-##     -11      0.925 V
-##     -10      0.95  V
-##     -9       0.975 V
-##     -8       1.0   V
-##     -7       1.025 V
-##     -6       1.05  V
-##     -5       1.075 V
-##     -4       1.1   V
-##     -3       1.125 V
-##     -2       1.15  V
-##     -1       1.175 V
-##     0        1.2   V (Default)
-##     1        1.225 V
-##     2        1.25  V
-##     3        1.275 V
-##     4        1.3   V
-##     5        1.325 V
-##     6        1.35  V
-##     7        1.375 V (requires force_turbo=1)
-##     8        1.4   V (requires force_turbo=1)
-##
-#over_voltage_min=0
-
-## over_voltage_sdram
-##     Sets over_voltage_sdram_c, over_voltage_sdram_i, over_voltage_sdram_p
-##     together
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     -16      0.8   V
-##     -15      0.825 V
-##     -14      0.85  V
-##     -13      0.875 V
-##     -12      0.9   V
-##     -11      0.925 V
-##     -10      0.95  V
-##     -9       0.975 V
-##     -8       1.0   V
-##     -7       1.025 V
-##     -6       1.05  V
-##     -5       1.075 V
-##     -4       1.1   V
-##     -3       1.125 V
-##     -2       1.15  V
-##     -1       1.175 V
-##     0        1.2   V (Default)
-##     1        1.225 V
-##     2        1.25  V
-##     3        1.275 V
-##     4        1.3   V
-##     5        1.325 V
-##     6        1.35  V
-##     7        1.375 V
-##     8        1.4   V
-##
-#over_voltage_sdram=0
-
-## over_voltage_sdram_c
-##     SDRAM controller voltage adjust.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     -16      0.8   V
-##     -15      0.825 V
-##     -14      0.85  V
-##     -13      0.875 V
-##     -12      0.9   V
-##     -11      0.925 V
-##     -10      0.95  V
-##     -9       0.975 V
-##     -8       1.0   V
-##     -7       1.025 V
-##     -6       1.05  V
-##     -5       1.075 V
-##     -4       1.1   V
-##     -3       1.125 V
-##     -2       1.15  V
-##     -1       1.175 V
-##     0        1.2   V (Default)
-##     1        1.225 V
-##     2        1.25  V
-##     3        1.275 V
-##     4        1.3   V
-##     5        1.325 V
-##     6        1.35  V
-##     7        1.375 V
-##     8        1.4   V
-##
-#over_voltage_sdram_c=0
-
-## over_voltage_sdram_i
-##     SDRAM I/O voltage adjust.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     -16      0.8   V
-##     -15      0.825 V
-##     -14      0.85  V
-##     -13      0.875 V
-##     -12      0.9   V
-##     -11      0.925 V
-##     -10      0.95  V
-##     -9       0.975 V
-##     -8       1.0   V
-##     -7       1.025 V
-##     -6       1.05  V
-##     -5       1.075 V
-##     -4       1.1   V
-##     -3       1.125 V
-##     -2       1.15  V
-##     -1       1.175 V
-##     0        1.2   V (Default)
-##     1        1.225 V
-##     2        1.25  V
-##     3        1.275 V
-##     4        1.3   V
-##     5        1.325 V
-##     6        1.35  V
-##     7        1.375 V
-##     8        1.4   V
-##
-#over_voltage_sdram_i=0
-
-## over_voltage_sdram_p
-##     SDRAM phy voltage adjust.
-##
-##     Value    Description
-##     -------------------------------------------------------------------------
-##     -16      0.8   V
-##     -15      0.825 V
-##     -14      0.85  V
-##     -13      0.875 V
-##     -12      0.9   V
-##     -11      0.925 V
-##     -10      0.95  V
-##     -9       0.975 V
-##     -8       1.0   V
-##     -7       1.025 V
-##     -6       1.05  V
-##     -5       1.075 V
-##     -4       1.1   V
-##     -3       1.125 V
-##     -2       1.15  V
-##     -1       1.175 V
-##     0        1.2   V (Default)
-##     1        1.225 V
-##     2        1.25  V
-##     3        1.275 V
-##     4        1.3   V
-##     5        1.325 V
-##     6        1.35  V
-##     7        1.375 V
-##     8        1.4   V
-##
-#over_voltage_sdram_p=0
-
-################################################################################
-##  Device Tree Settings
-################################################################################
-
-dtparam=random=on
-dtparam=watchdog=on
-dtparam=audio=on
-dtparam=i2c0=on
-dtparam=i2c1=on
-dtparam=spi=on
-
-#dtoverlay=adau1977-adc
-#dtoverlay=allo-piano-dac-pcm512x-audio
-#dtoverlay=audioinjector-wm8731-audio
-#dtoverlay=dionaudio-loco
-#dtoverlay=hifiberry-amp
-#dtoverlay=hifiberry-dac
-#dtoverlay=hifiberry-dacplus
-#dtoverlay=hifiberry-digi
-#dtoverlay=hifiberry-digi-pro
-#dtoverlay=iqaudio-dac
-#dtoverlay=iqaudio-dacplus
-#dtoverlay=iqaudio-digi-wm8804-audio
-#dtoverlay=justboom-dac
-#dtoverlay=justboom-digi
-#dtoverlay=pisound
-#dtoverlay=raspidac3
-#dtoverlay=rpi-dac
-#dtoverlay=rpi-proto
-#dtoverlay=rra-digidac1-wm8741-audio