diff --git a/common/image-fit.c b/common/image-fit.c index c9ffc441aa..e346fed550 100644 --- a/common/image-fit.c +++ b/common/image-fit.c @@ -1522,6 +1522,10 @@ int fit_check_format(const void *fit) * compatible list, "foo,bar", matches a compatible string in the root of fdt1. * "bim,bam" in fdt2 matches the second string which isn't as good as fdt1. * + * As an optimization, the compatible property from the FDT's root node can be + * copied into the configuration node in the FIT image. This is required to + * match configurations with compressed FDTs. + * * returns: * offset to the configuration to use if one was found * -1 otherwise @@ -1554,55 +1558,62 @@ int fit_conf_find_compat(const void *fit, const void *fdt) for (noffset = fdt_next_node(fit, confs_noffset, &ndepth); (noffset >= 0) && (ndepth > 0); noffset = fdt_next_node(fit, noffset, &ndepth)) { - const void *kfdt; + const void *fdt; const char *kfdt_name; - int kfdt_noffset; + int kfdt_noffset, compat_noffset; const char *cur_fdt_compat; int len; - size_t size; + size_t sz; int i; if (ndepth > 1) continue; - kfdt_name = fdt_getprop(fit, noffset, "fdt", &len); - if (!kfdt_name) { - debug("No fdt property found.\n"); - continue; - } - kfdt_noffset = fdt_subnode_offset(fit, images_noffset, - kfdt_name); - if (kfdt_noffset < 0) { - debug("No image node named \"%s\" found.\n", - kfdt_name); - continue; - } + /* If there's a compat property in the config node, use that. */ + if (fdt_getprop(fit, noffset, "compatible", NULL)) { + fdt = fit; /* search in FIT image */ + compat_noffset = noffset; /* search under config node */ + } else { /* Otherwise extract it from the kernel FDT. */ + kfdt_name = fdt_getprop(fit, noffset, "fdt", &len); + if (!kfdt_name) { + debug("No fdt property found.\n"); + continue; + } + kfdt_noffset = fdt_subnode_offset(fit, images_noffset, + kfdt_name); + if (kfdt_noffset < 0) { + debug("No image node named \"%s\" found.\n", + kfdt_name); + continue; + } - if (!fit_image_check_comp(fit, kfdt_noffset, IH_COMP_NONE)) { - debug("Can't extract compat from \"%s\" (compressed)\n", - kfdt_name); - continue; - } + if (!fit_image_check_comp(fit, kfdt_noffset, + IH_COMP_NONE)) { + debug("Can't extract compat from \"%s\" " + "(compressed)\n", kfdt_name); + continue; + } - /* - * Get a pointer to this configuration's fdt. - */ - if (fit_image_get_data(fit, kfdt_noffset, &kfdt, &size)) { - debug("Failed to get fdt \"%s\".\n", kfdt_name); - continue; + /* search in this config's kernel FDT */ + if (fit_image_get_data(fit, kfdt_noffset, &fdt, &sz)) { + debug("Failed to get fdt \"%s\".\n", kfdt_name); + continue; + } + + compat_noffset = 0; /* search kFDT under root node */ } len = fdt_compat_len; cur_fdt_compat = fdt_compat; /* * Look for a match for each U-Boot compatibility string in - * turn in this configuration's fdt. + * turn in the compat string property. */ for (i = 0; len > 0 && (!best_match_offset || best_match_pos > i); i++) { int cur_len = strlen(cur_fdt_compat) + 1; - if (!fdt_node_check_compatible(kfdt, 0, + if (!fdt_node_check_compatible(fdt, compat_noffset, cur_fdt_compat)) { best_match_offset = noffset; best_match_pos = i; diff --git a/doc/uImage.FIT/kernel_fdts_compressed.its b/doc/uImage.FIT/kernel_fdts_compressed.its new file mode 100644 index 0000000000..8f81106efc --- /dev/null +++ b/doc/uImage.FIT/kernel_fdts_compressed.its @@ -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"; + }; + }; +}; diff --git a/doc/uImage.FIT/source_file_format.txt b/doc/uImage.FIT/source_file_format.txt index d701b9bb76..f8e27ed34e 100644 --- a/doc/uImage.FIT/source_file_format.txt +++ b/doc/uImage.FIT/source_file_format.txt @@ -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.