This provides a way to load a FIT containing U-Boot and a selection of device tree files. The board can select the correct device tree by probing the hardware. Then U-Boot is started with the selected device tree. Signed-off-by: Simon Glass <sjg@chromium.org>master
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/*
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* Copyright (C) 2016 Google, Inc |
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* Written by Simon Glass <sjg@chromium.org> |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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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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#include <spl.h> |
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static ulong fdt_getprop_u32(const void *fdt, int node, const char *prop) |
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{ |
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const u32 *cell; |
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int len; |
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cell = fdt_getprop(fdt, node, prop, &len); |
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if (len != sizeof(*cell)) |
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return -1U; |
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return fdt32_to_cpu(*cell); |
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} |
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static int spl_fit_select_fdt(const void *fdt, int images, int *fdt_offsetp) |
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{ |
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const char *name, *fdt_name; |
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int conf, node, fdt_node; |
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int len; |
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*fdt_offsetp = 0; |
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conf = fdt_path_offset(fdt, FIT_CONFS_PATH); |
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if (conf < 0) { |
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debug("%s: Cannot find /configurations node: %d\n", __func__, |
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conf); |
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return -EINVAL; |
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} |
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for (node = fdt_first_subnode(fdt, conf); |
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node >= 0; |
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node = fdt_next_subnode(fdt, node)) { |
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name = fdt_getprop(fdt, node, "description", &len); |
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if (!name) |
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return -EINVAL; |
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if (board_fit_config_name_match(name)) |
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continue; |
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debug("Selecting config '%s'", name); |
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fdt_name = fdt_getprop(fdt, node, FIT_FDT_PROP, &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__, len); |
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return -EINVAL; |
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} |
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debug(", fdt '%s'\n", fdt_name); |
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fdt_node = fdt_subnode_offset(fdt, 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_offsetp = fdt_getprop_u32(fdt, fdt_node, "data-offset"); |
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len = fdt_getprop_u32(fdt, fdt_node, "data-size"); |
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#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT |
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printf("FIT: Selected '%s'\n", name); |
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#endif |
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return len; |
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} |
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#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT |
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printf("No matching DT out of these options:\n"); |
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for (node = fdt_first_subnode(fdt, conf); |
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node >= 0; |
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node = fdt_next_subnode(fdt, node)) { |
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name = fdt_getprop(fdt, node, "name", &len); |
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printf(" %s\n", name); |
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} |
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#endif |
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return -ENOENT; |
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} |
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int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit) |
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{ |
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int sectors; |
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ulong size, load; |
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unsigned long count; |
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int node, images; |
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void *load_ptr; |
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int fdt_offset, fdt_len; |
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int data_offset, data_size; |
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int base_offset; |
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int src_sector; |
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void *dst; |
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/*
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* Figure out where the external images start. This is the base for the |
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* data-offset properties in each image. |
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*/ |
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size = fdt_totalsize(fit); |
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size = (size + 3) & ~3; |
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base_offset = (size + 3) & ~3; |
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/*
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* So far we only have one block of data from the FIT. Read the entire |
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* thing, including that first block, placing it so it finishes before |
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* where we will load the image. |
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* |
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* Note that we will load the image such that its first byte will be |
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* at the load address. Since that byte may be part-way through a |
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* block, we may load the image up to one block before the load |
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* address. So take account of that here by subtracting an addition |
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* block length from the FIT start position. |
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* |
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* In fact the FIT has its own load address, but we assume it cannot |
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* be before CONFIG_SYS_TEXT_BASE. |
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*/ |
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fit = (void *)(CONFIG_SYS_TEXT_BASE - size - info->bl_len); |
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sectors = (size + info->bl_len - 1) / info->bl_len; |
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count = info->read(info, sector, sectors, fit); |
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debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu\n", |
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sector, sectors, fit, count); |
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if (count == 0) |
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return -EIO; |
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/* find the firmware image to load */ |
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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 -1; |
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} |
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node = fdt_first_subnode(fit, images); |
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if (node < 0) { |
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debug("%s: Cannot find first image node: %d\n", __func__, node); |
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return -1; |
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} |
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/* Get its information and set up the spl_image structure */ |
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data_offset = fdt_getprop_u32(fit, node, "data-offset"); |
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data_size = fdt_getprop_u32(fit, node, "data-size"); |
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load = fdt_getprop_u32(fit, node, "load"); |
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debug("data_offset=%x, data_size=%x\n", data_offset, data_size); |
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spl_image.load_addr = load; |
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spl_image.entry_point = load; |
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spl_image.os = IH_OS_U_BOOT; |
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/*
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* Work out where to place the image. We read it so that the first |
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* byte will be at 'load'. This may mean we need to load it starting |
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* before then, since we can only read whole blocks. |
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*/ |
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sectors = (data_size + info->bl_len - 1) / info->bl_len; |
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data_offset += base_offset; |
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load_ptr = (void *)load; |
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debug("U-Boot size %x, data %p\n", data_size, load_ptr); |
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dst = load_ptr - (data_offset % info->bl_len); |
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/* Read the image */ |
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src_sector = sector + data_offset / info->bl_len; |
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debug("image: data_offset=%x, dst=%p, src_sector=%x, sectors=%x\n", |
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data_offset, dst, src_sector, sectors); |
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count = info->read(info, src_sector, sectors, dst); |
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if (count != sectors) |
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return -EIO; |
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/* Figure out which device tree the board wants to use */ |
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fdt_len = spl_fit_select_fdt(fit, images, &fdt_offset); |
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if (fdt_len < 0) |
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return fdt_len; |
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/*
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* Read the device tree and place it after the image. There may be |
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* some extra data before it since we can only read entire blocks. |
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*/ |
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dst = load_ptr + data_size; |
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fdt_offset += base_offset; |
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count = info->read(info, sector + fdt_offset / info->bl_len, sectors, |
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dst); |
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debug("fit read %x sectors to %x, dst %p, data_offset %x\n", |
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sectors, spl_image.load_addr, dst, fdt_offset); |
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if (count != sectors) |
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return -EIO; |
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/*
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* Copy the device tree so that it starts immediately after the image. |
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* After this we will have the U-Boot image and its device tree ready |
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* for us to start. |
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*/ |
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memcpy(dst, dst + fdt_offset % info->bl_len, fdt_len); |
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return 0; |
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} |
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