Commit f1dcee59 authored by Simon Glass's avatar Simon Glass Committed by Tom Rini

spl: Add an option to load a FIT containing U-Boot

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: default avatarSimon Glass <>
parent 4b307f23
......@@ -273,6 +273,17 @@ config SYS_TEXT_BASE
TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture
bool "Enable SPL loading U-Boot as a FIT"
depends on FIT
Normally with the SPL framework a legacy image is generated as part
of the build. This contains U-Boot along with information as to
where it should be loaded. This option instead enables generation
of a FIT (Flat Image Tree) which provides more flexibility. In
particular it can handle selecting from multiple device tree
and passing the correct one to U-Boot.
depends on ARC || ARCH_SUNXI
int "CPU clock frequency"
......@@ -10,6 +10,7 @@
obj-$(CONFIG_SPL_FRAMEWORK) += spl.o
obj-$(CONFIG_SPL_LOAD_FIT) += spl_fit.o
obj-$(CONFIG_SPL_NOR_SUPPORT) += spl_nor.o
obj-$(CONFIG_SPL_YMODEM_SUPPORT) += spl_ymodem.o
obj-$(CONFIG_SPL_NAND_SUPPORT) += spl_nand.o
* Copyright (C) 2016 Google, Inc
* Written by Simon Glass <>
* SPDX-License-Identifier: GPL-2.0+
#include <common.h>
#include <errno.h>
#include <image.h>
#include <libfdt.h>
#include <spl.h>
static ulong fdt_getprop_u32(const void *fdt, int node, const char *prop)
const u32 *cell;
int len;
cell = fdt_getprop(fdt, node, prop, &len);
if (len != sizeof(*cell))
return -1U;
return fdt32_to_cpu(*cell);
static int spl_fit_select_fdt(const void *fdt, int images, int *fdt_offsetp)
const char *name, *fdt_name;
int conf, node, fdt_node;
int len;
*fdt_offsetp = 0;
conf = fdt_path_offset(fdt, FIT_CONFS_PATH);
if (conf < 0) {
debug("%s: Cannot find /configurations node: %d\n", __func__,
return -EINVAL;
for (node = fdt_first_subnode(fdt, conf);
node >= 0;
node = fdt_next_subnode(fdt, node)) {
name = fdt_getprop(fdt, node, "description", &len);
if (!name)
return -EINVAL;
if (board_fit_config_name_match(name))
debug("Selecting config '%s'", name);
fdt_name = fdt_getprop(fdt, node, FIT_FDT_PROP, &len);
if (!fdt_name) {
debug("%s: Cannot find fdt name property: %d\n",
__func__, len);
return -EINVAL;
debug(", fdt '%s'\n", fdt_name);
fdt_node = fdt_subnode_offset(fdt, images, fdt_name);
if (fdt_node < 0) {
debug("%s: Cannot find fdt node '%s': %d\n",
__func__, fdt_name, fdt_node);
return -EINVAL;
*fdt_offsetp = fdt_getprop_u32(fdt, fdt_node, "data-offset");
len = fdt_getprop_u32(fdt, fdt_node, "data-size");
printf("FIT: Selected '%s'\n", name);
return len;
printf("No matching DT out of these options:\n");
for (node = fdt_first_subnode(fdt, conf);
node >= 0;
node = fdt_next_subnode(fdt, node)) {
name = fdt_getprop(fdt, node, "name", &len);
printf(" %s\n", name);
return -ENOENT;
int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fit)
int sectors;
ulong size, load;
unsigned long count;
int node, images;
void *load_ptr;
int fdt_offset, fdt_len;
int data_offset, data_size;
int base_offset;
int src_sector;
void *dst;
* Figure out where the external images start. This is the base for the
* data-offset properties in each image.
size = fdt_totalsize(fit);
size = (size + 3) & ~3;
base_offset = (size + 3) & ~3;
* So far we only have one block of data from the FIT. Read the entire
* thing, including that first block, placing it so it finishes before
* where we will load the image.
* Note that we will load the image such that its first byte will be
* at the load address. Since that byte may be part-way through a
* block, we may load the image up to one block before the load
* address. So take account of that here by subtracting an addition
* block length from the FIT start position.
* In fact the FIT has its own load address, but we assume it cannot
fit = (void *)(CONFIG_SYS_TEXT_BASE - size - info->bl_len);
sectors = (size + info->bl_len - 1) / info->bl_len;
count = info->read(info, sector, sectors, fit);
debug("fit read sector %lx, sectors=%d, dst=%p, count=%lu\n",
sector, sectors, fit, count);
if (count == 0)
return -EIO;
/* find the firmware image to load */
images = fdt_path_offset(fit, FIT_IMAGES_PATH);
if (images < 0) {
debug("%s: Cannot find /images node: %d\n", __func__, images);
return -1;
node = fdt_first_subnode(fit, images);
if (node < 0) {
debug("%s: Cannot find first image node: %d\n", __func__, node);
return -1;
/* Get its information and set up the spl_image structure */
data_offset = fdt_getprop_u32(fit, node, "data-offset");
data_size = fdt_getprop_u32(fit, node, "data-size");
load = fdt_getprop_u32(fit, node, "load");
debug("data_offset=%x, data_size=%x\n", data_offset, data_size);
spl_image.load_addr = load;
spl_image.entry_point = load;
spl_image.os = IH_OS_U_BOOT;
* Work out where to place the image. We read it so that the first
* byte will be at 'load'. This may mean we need to load it starting
* before then, since we can only read whole blocks.
sectors = (data_size + info->bl_len - 1) / info->bl_len;
data_offset += base_offset;
load_ptr = (void *)load;
debug("U-Boot size %x, data %p\n", data_size, load_ptr);
dst = load_ptr - (data_offset % info->bl_len);
/* Read the image */
src_sector = sector + data_offset / info->bl_len;
debug("image: data_offset=%x, dst=%p, src_sector=%x, sectors=%x\n",
data_offset, dst, src_sector, sectors);
count = info->read(info, src_sector, sectors, dst);
if (count != sectors)
return -EIO;
/* Figure out which device tree the board wants to use */
fdt_len = spl_fit_select_fdt(fit, images, &fdt_offset);
if (fdt_len < 0)
return fdt_len;
* Read the device tree and place it after the image. There may be
* some extra data before it since we can only read entire blocks.
dst = load_ptr + data_size;
fdt_offset += base_offset;
count = info->read(info, sector + fdt_offset / info->bl_len, sectors,
debug("fit read %x sectors to %x, dst %p, data_offset %x\n",
sectors, spl_image.load_addr, dst, fdt_offset);
if (count != sectors)
return -EIO;
* Copy the device tree so that it starts immediately after the image.
* After this we will have the U-Boot image and its device tree ready
* for us to start.
memcpy(dst, dst + fdt_offset % info->bl_len, fdt_len);
return 0;
......@@ -780,7 +780,6 @@ int bootz_setup(ulong image, ulong *start, ulong *end);
/* New uImage format specific code (prefixed with fit_) */
#define FIT_IMAGES_PATH "/images"
#define FIT_CONFS_PATH "/configurations"
......@@ -813,6 +812,7 @@ int bootz_setup(ulong image, ulong *start, ulong *end);
/* cmdline argument format parsing */
int fit_parse_conf(const char *spec, ulong addr_curr,
ulong *addr, const char **conf_name);
......@@ -29,6 +29,24 @@ struct spl_image_info {
u32 flags;
* Information required to load data from a device
* @dev: Pointer to the device, e.g. struct mmc *
* @priv: Private data for the device
* @bl_len: Block length for reading in bytes
* @read: Function to call to read from the device
struct spl_load_info {
void *dev;
void *priv;
int bl_len;
ulong (*read)(struct spl_load_info *load, ulong sector, ulong count,
void *buf);
int spl_load_simple_fit(struct spl_load_info *info, ulong sector, void *fdt);
extern struct spl_image_info spl_image;
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment