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https://github.com/brain-hackers/u-boot-brain
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boot_fit: Create helper functions that can be used to select DTB out of FIT
Some platforms may append a FIT image to the U-boot image. This function aids in parsing the FIT image and selecting the correct DTB at runtime. Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
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@ -437,6 +437,13 @@ config SYS_STDIO_DEREGISTER
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endmenu
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config FIT_EMBED
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bool "Support a FIT image embedded in the U-boot image"
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help
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This option provides hooks to allow U-boot to parse an
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appended FIT image and enable board specific code to then select
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the correct DTB to be used.
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config DEFAULT_FDT_FILE
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string "Default fdt file"
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help
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@ -151,6 +151,7 @@ obj-y += image.o
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obj-$(CONFIG_ANDROID_BOOT_IMAGE) += image-android.o
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obj-$(CONFIG_$(SPL_)OF_LIBFDT) += image-fdt.o
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obj-$(CONFIG_$(SPL_)FIT) += image-fit.o
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obj-$(CONFIG_FIT_EMBED) += boot_fit.o common_fit.o
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obj-$(CONFIG_$(SPL_)FIT_SIGNATURE) += image-sig.o
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obj-$(CONFIG_IO_TRACE) += iotrace.o
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obj-y += memsize.o
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80
common/boot_fit.c
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80
common/boot_fit.c
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@ -0,0 +1,80 @@
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/*
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* (C) Copyright 2017
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* Texas Instruments, <www.ti.com>
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*
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* Franklin S Cooper Jr. <fcooper@ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <boot_fit.h>
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#include <common.h>
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#include <errno.h>
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#include <image.h>
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#include <libfdt.h>
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int fdt_offset(void *fit)
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{
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int images, node, fdt_len, fdt_node, fdt_offset;
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const char *fdt_name;
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node = fit_find_config_node(fit);
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if (node < 0)
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return node;
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images = fdt_path_offset(fit, FIT_IMAGES_PATH);
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if (images < 0) {
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debug("%s: Cannot find /images node: %d\n", __func__, images);
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return FDT_ERROR;
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}
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fdt_name = fdt_getprop(fit, node, FIT_FDT_PROP, &fdt_len);
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if (!fdt_name) {
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debug("%s: Cannot find fdt name property: %d\n",
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__func__, fdt_len);
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return -EINVAL;
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}
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fdt_node = fdt_subnode_offset(fit, images, fdt_name);
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if (fdt_node < 0) {
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debug("%s: Cannot find fdt node '%s': %d\n",
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__func__, fdt_name, fdt_node);
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return -EINVAL;
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}
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fdt_offset = fdt_getprop_u32(fit, fdt_node, "data-offset");
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if (fdt_offset == FDT_ERROR)
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return -ENOENT;
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fdt_len = fdt_getprop_u32(fit, fdt_node, "data-size");
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if (fdt_len < 0)
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return fdt_len;
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return fdt_offset;
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}
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void *locate_dtb_in_fit(void *fit)
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{
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struct image_header *header;
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int size;
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int ret;
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size = fdt_totalsize(fit);
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size = (size + 3) & ~3;
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header = (struct image_header *)fit;
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if (image_get_magic(header) != FDT_MAGIC) {
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debug("No FIT image appended to U-boot\n");
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return NULL;
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}
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ret = fdt_offset(fit);
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if (ret <= 0)
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return NULL;
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else
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return (void *)fit+size+ret;
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}
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9
include/boot_fit.h
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9
include/boot_fit.h
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/*
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* Copyright (C) 2017 Texas Instruments
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* Written by Franklin Cooper Jr. <fcooper@ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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int fdt_offset(void *fit);
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void *locate_dtb_in_fit(void *fit);
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@ -1272,6 +1272,9 @@ void board_fit_image_post_process(void **p_image, size_t *p_size);
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#define FDT_ERROR ((ulong)(-1))
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ulong fdt_getprop_u32(const void *fdt, int node, const char *prop);
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int fit_find_config_node(const void *fdt);
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/**
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* Mapping of image types to function handlers to be invoked on the associated
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* loaded images
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