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https://github.com/AsahiLinux/u-boot
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92926bc80c
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>
80 lines
1.5 KiB
C
80 lines
1.5 KiB
C
/*
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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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