|
o images
| |
- | o image@1 {...}
- | o image@2 {...}
+ | o image-1 {...}
+ | o image-2 {...}
| ...
|
o configurations
- |- default = "conf@1"
+ |- default = "conf-1"
|
- o conf@1 {...}
- o conf@2 {...}
+ o conf-1 {...}
+ o conf-2 {...}
...
This node is a container node for component sub-image nodes. Each sub-node of
the '/images' node should have the following layout:
- o image@1
+ o image-1
|- description = "component sub-image description"
|- data = /incbin/("path/to/data/file.bin")
|- type = "sub-image type name"
|- load = <00000000>
|- entry = <00000000>
|
- o hash@1 {...}
- o hash@2 {...}
+ o hash-1 {...}
+ o hash-2 {...}
...
Mandatory properties:
- description : Textual description of the component sub-image
- type : Name of component sub-image type, supported types are:
- "standalone", "kernel", "ramdisk", "firmware", "script", "filesystem",
- "flat_dt" and others (see uimage_type in common/image.c).
+ "standalone", "kernel", "kernel_noload", "ramdisk", "firmware", "script",
+ "filesystem", "flat_dt" and others (see uimage_type in common/image.c).
- data : Path to the external file which contains this node's binary data.
- compression : Compression used by included data. Supported compressions
are "gzip" and "bzip2". If no compression is used compression property
- should be set to "none".
+ should be set to "none". If the data is compressed but it should not be
+ uncompressed by U-Boot (e.g. compressed ramdisk), this should also be set
+ to "none".
Conditionally mandatory property:
- os : OS name, mandatory for types "kernel" and "ramdisk". Valid OS names
property of the root node. Mandatory for types: "standalone" and "kernel".
Optional nodes:
- - hash@1 : Each hash sub-node represents separate hash or checksum
+ - hash-1 : Each hash sub-node represents separate hash or checksum
calculated for node's data according to specified algorithm.
5) Hash nodes
-------------
-o hash@1
+o hash-1
|- algo = "hash or checksum algorithm name"
|- value = [hash or checksum value]
o configurations
|- default = "default configuration sub-node unit name"
|
- o config@1 {...}
- o config@2 {...}
+ o config-1 {...}
+ o config-2 {...}
...
Each configuration has the following structure:
-o config@1
+o config-1
|- description = "configuration description"
|- kernel = "kernel sub-node unit name"
|- ramdisk = "ramdisk sub-node unit name"
- |- fdt = "fdt sub-node unit-name"
+ |- fdt = "fdt sub-node unit-name" [, "fdt overlay sub-node unit-name", ...]
|- fpga = "fpga sub-node unit-name"
|- loadables = "loadables sub-node unit-name"
+ |- compatible = "vendor,board-style device tree compatible string"
Mandatory properties:
- ramdisk : Unit name of the corresponding ramdisk image (component image
node of a "ramdisk" type).
- fdt : Unit name of the corresponding fdt blob (component image node of a
- "fdt type").
+ "fdt type"). Additional fdt overlay nodes can be supplied which signify
+ that the resulting device tree blob is generated by the first base fdt
+ blob with all subsequent overlays applied.
- setup : Unit name of the corresponding setup binary (used for booting
an x86 kernel). This contains the setup.bin file built by the kernel.
- fpga : Unit name of the corresponding fpga bitstream blob
(component image node of a "fpga type").
- loadables : Unit name containing a list of additional binaries to be
loaded at their given locations. "loadables" is a comma-separated list
- of strings. U-Boot will load each binary at its given start-address.
+ of strings. U-Boot will load each binary at its given start-address and
+ may optionally invoke additional post-processing steps on this binary based
+ on its component image node type.
+ - compatible : The root compatible string of the U-Boot device tree that
+ this configuration shall automatically match when CONFIG_FIT_BEST_MATCH is
+ enabled. If this property is not provided, the compatible string will be
+ extracted from the fdt blob instead. This is only possible if the fdt is
+ not compressed, so images with compressed fdts that want to use compatible
+ string matching must always provide this property.
The FDT blob is required to properly boot FDT based kernel, so the minimal
configuration for 2.6 FDT kernel is (kernel, fdt) pair.
aligned to a 4-byte boundary.
- data-size : size of the data in bytes
+The 'data-offset' property can be substituted with 'data-position', which
+defines an absolute position or address as the offset. This is helpful when
+booting U-Boot proper before performing relocation. Pass '-p [offset]' to
+mkimage to enable 'data-position'.
+
+Normal kernel FIT image has data embedded within FIT structure. U-Boot image
+for SPL boot has external data. Existence of 'data-offset' can be used to
+identify which format is used.
+
+For FIT image with external data, it would be better to align each blob of data
+to block(512 byte) for block device, so that we don't need to do the copy when
+read the image data in SPL. Pass '-B 0x200' to mkimage to align the FIT
+structure and data to 512 byte, other values available for other align size.
9) Examples
-----------
projects / oweals / u-boot.git / blobdiff