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fit: Support compat string property in configuration node

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This patch adds support for an optional optimization to compatible
string matching where the compatible string property from the root node
of the kernel FDT can be copied into the configuration node of the FIT
image. This is most useful when using compressed FDTs or when using FDT
overlays, where the traditional extraction of the compatible string from
the kernel FDT itself is not easily possible.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Julius Werner
2019-07-24 19:37:56 -07:00
committed by Tom Rini
parent b1307f884a
commit 18cfa612a9
3 changed files with 119 additions and 28 deletions
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73
doc/uImage.FIT/kernel_fdts_compressed.its Normal file
View File

@@ -0,0 +1,73 @@
/*
* U-Boot uImage source file with a kernel and multiple compressed FDT blobs.
* Since the FDTs are compressed, configurations must provide a compatible
* string to match directly.
*/
/dts-v1/;
/ {
description = "Image with single Linux kernel and compressed FDT blobs";
#address-cells = <1>;
images {
kernel {
description = "Vanilla Linux kernel";
data = /incbin/("./vmlinux.bin.gz");
type = "kernel";
arch = "ppc";
os = "linux";
compression = "gzip";
load = <00000000>;
entry = <00000000>;
hash-1 {
algo = "crc32";
};
hash-2 {
algo = "sha1";
};
};
fdt@1 {
description = "Flattened Device Tree blob 1";
data = /incbin/("./myboard-var1.dtb");
type = "flat_dt";
arch = "ppc";
compression = "gzip";
hash-1 {
algo = "crc32";
};
hash-2 {
algo = "sha1";
};
};
fdt@2 {
description = "Flattened Device Tree blob 2";
data = /incbin/("./myboard-var2.dtb");
type = "flat_dt";
arch = "ppc";
compression = "lzma";
hash-1 {
algo = "crc32";
};
hash-2 {
algo = "sha1";
};
};
};
configurations {
default = "conf@1";
conf@1 {
description = "Boot Linux kernel with FDT blob 1";
kernel = "kernel";
fdt = "fdt@1";
compatible = "myvendor,myboard-variant1";
};
conf@2 {
description = "Boot Linux kernel with FDT blob 2";
kernel = "kernel";
fdt = "fdt@2";
compatible = "myvendor,myboard-variant2";
};
};
};

7
doc/uImage.FIT/source_file_format.txt
View File

@@ -240,6 +240,7 @@ o config-1
|- 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:
@@ -263,6 +264,12 @@ o config-1
of strings. U-Boot will load each binary at its given start-address and
may optionaly 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.