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rpi-config: support more commonly used config variables and update documentation

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Added support for and documented the following new extra build options:

* gpu_freq overclocking option
* disable boot rainbow splash screen
* configure the boot delay after GPU firmware loading
* configure common HDMI and composite video options

Signed-off-by: Hugo Hromic <hhromic@gmail.com>
This commit is contained in:
Hugo Hromic
2018-04-16 14:03:13 +01:00
committed by Andrei Gherzan
parent 5641ac3730
commit 3175e7f3e2
2 changed files with 88 additions and 5 deletions
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docs/extra-build-config.md
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@@ -32,6 +32,8 @@ Accommodate the values above to your own needs (ex: ext3 / ext4).
* `GPU_MEM_1024`: GPU memory in megabyte for the 1024MB Raspberry Pi. Ignored by
the 256MB/512MB RP. Overrides gpu_mem. Max 944. Default not set.
See: <https://www.raspberrypi.org/documentation/configuration/config-txt/memory.md>
## Add purchased license codecs
To add you own licenses use variables `KEY_DECODE_MPG2` and `KEY_DECODE_WVC1` in
@@ -44,6 +46,7 @@ You can supply more licenses separated by comma. Example:
KEY_DECODE_WVC1 = "0x12345678,0xabcdabcd,0x87654321"
See: <https://www.raspberrypi.org/documentation/configuration/config-txt/codeclicence.md>
## Disable overscan
@@ -53,18 +56,57 @@ local.conf:
DISABLE_OVERSCAN = "1"
## Disable splash screen
By default a rainbow splash screen is shown after the GPU firmware is loaded.
To disable this set this variable in local.conf:
DISABLE_SPLASH = "1"
## Boot delay
The Raspberry Pi waits a number of seconds after loading the GPU firmware and
before loading the kernel. By default it is one second. This is useful if your
SD card needs a while to get ready before Linux is able to boot from it.
To remove (or adjust) this delay set these variables in local.conf:
BOOT_DELAY = "0"
BOOT_DELAY_MS = "0"
## Set overclocking options
The Raspberry PI can be overclocked. As of now overclocking up to the "Turbo
The Raspberry Pi can be overclocked. As of now overclocking up to the "Turbo
Mode" is officially supported by the raspbery and does not void warranty. Check
the config.txt for a detailed description of options and modes. Example turbo
mode:
the config.txt for a detailed description of options and modes. The following
variables are supported in local.conf: `ARM_FREQ`, `GPU_FREQ`, `CORE_FREQ`,
`SDRAM_FREQ` and `OVER_VOLTAGE`.
Example official settings for Turbo Mode in Raspberry Pi 2:
ARM_FREQ = "1000"
CORE_FREQ = "500"
SDRAM_FREQ = "500"
OVER_VOLTAGE = "6"
See: <https://www.raspberrypi.org/documentation/configuration/config-txt/overclocking.md>
## HDMI and composite video options
The Raspberry Pi can output video over HDMI or SDTV composite (the RCA connector).
By default the video mode for these is autodetected on boot: the HDMI mode is
selected according to the connected monitor's EDID information and the composite
mode is defaulted to NTSC using a 4:3 aspect ratio. Check the config.txt for a
detailed description of options and modes. The following variables are supported in
local.conf: `HDMI_FORCE_HOTPLUG`, `HDMI_DRIVE`, `HDMI_GROUP`, `HDMI_MODE`,
`CONFIG_HDMI_BOOST`, `SDTV_MODE`, `SDTV_ASPECT` and `DISPLAY_ROTATE`.
Example to force HDMI output to 720p in CEA mode:
HDMI_GROUP = "1"
HDMI_MODE = "4"
See: <https://www.raspberrypi.org/documentation/configuration/config-txt/video.md>
## Video camera support with V4L2 drivers
Set this variable to enable support for the video camera (Linux 3.12.4+