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https://source.denx.de/u-boot/u-boot.git
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7de8bd03c3
The current API is outdated as it requires a devicetree pointer. Move these functions to use the ofnode API and update this globally. Add some tests while we are here. Correct the call in exynos_dsim_config_parse_dt() which is obviously wrong. Signed-off-by: Simon Glass <sjg@chromium.org>
106 lines
4.3 KiB
Plaintext
106 lines
4.3 KiB
Plaintext
The /config node (Configuration Options)
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A number of run-time configuration options are provided in the /config node
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of the control device tree. You can access these using ofnode_conf_read_int(),
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ofnode_conf_read_bool() and ofnode_conf_read_str().
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These options are designed to affect the operation of U-Boot at runtime.
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Runtime-configuration items can help avoid proliferation of different builds
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with only minor changes, e.g. enabling and disabling console output. Items
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here should be those that can usefully be set by the build system after U-Boot
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is built.
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Available options are:
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bootcmd (string)
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Allows overwriting of the boot command used by U-Boot on startup. If
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present, U-Boot uses this command instead. Note that this feature can
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work even if loading the environment is disabled, e.g. for security
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reasons. See also bootsecure.
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bootdelay (int)
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This allows selecting of the U-Boot bootdelay, to control whether U-Boot
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waits on boot or for how long. This allows this option to be configured
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by the build system or by a previous-stage binary. For example, if the
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images is being packed for testing or a user holds down a button, it may
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allow a delay, but disable it for production.
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u-boot,boot-led (string)
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u-boot,error-led (string)
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This is used to specify the label for an LED to indicate an error and
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a successful boot, on supported hardware.
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bootsecure (int)
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Indicates that U-Boot should use secure_boot_cmd() to run commands,
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rather than the normal CLI. This can be used in production images, to
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restrict the amount of parsing done or the options available, to cut
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back on the available surface for security attacks.
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u-boot,efi-partition-entries-offset (int)
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If present, this provides an offset (in bytes, from the start of a
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device) that should be skipped over before the partition entries.
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This is used by the EFI/GPT partition implementation when a device
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is formatted.
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This setting will override any values configured via Kconfig.
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kernel-offset (int)
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This allows setting the 'kernaddr' environment variable, used to select
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the address to load the kernel. It is useful for systems that use U-Boot
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to flash a device, so the scripts that do this know where to put the
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kernel to be flashed.
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load-environment (int)
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Allows control over whether U-Boot loads its environment after
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relocation (0=no, 1 or not present=yes).
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u-boot,mmc-env-offset (int)
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u-boot,mmc-env-offset-redundant (int)
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If present, the values of the 'u-boot,mmc-env-offset' and/or
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of the u-boot,mmc-env-offset-redundant' properties overrides
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CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND, respectively,
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for SD/MMC devices.
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Values are interpreted as the offset from the start of the
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device, specified in bytes. It is assumed that the setting
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will point at the beginning of a LBA and values that are not
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LBA-aligned will be rounded up to the next LBA address.
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u-boot,mmc-env-partition (int)
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if present, the environment shall be placed at the last
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CONFIG_ENV_SIZE blocks of the partition on the
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CONFIG_SYS_MMC_ENV_DEV.
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if u-boot,mmc-env-offset* is present, this setting will take
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precedence. In that case, only if the partition is not found,
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mmc-env-offset* will be tried.
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u-boot,no-apm-finalize (bool)
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For x86 devices running on coreboot, this tells U-Boot not to lock
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down the Intel Management Engine (ME) registers. This allows U-Boot to
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access the hardware more fully for platforms that need it.
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u-boot,no-keyboard (bool)
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Tells U-Boot not to expect an attached keyboard with a VGA console.
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rootdisk-offset (int)
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This allows setting the 'rootdisk' environment variable, used to select
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the address to load the rootdisk. It is useful for systems that use
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U-Boot to flash a device, so the scripts that do this know where to put
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the root disk to be flashed.
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silent-console (int)
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If present and non-zero, the console is silenced by default on boot.
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u-boot,spl-payload-offset (int)
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If present (and SPL is controlled by the device-tree), this allows
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to override the CONFIG_SYS_SPI_U_BOOT_OFFS setting using a value
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from the device-tree.
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sysreset-gpio (string)
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If present (and supported by the specific board), indicates a
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GPIO that can be set to trigger a system reset. It is assumed
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that such a system reset will effect a complete platform reset,
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being roughly equivalent to a power-on reset.
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