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 --- common/Kconfig | 8 ++++++++ common/Makefile | 1 + common/boot_fit.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ include/boot_fit.h | 9 +++++++++ include/image.h | 8 ++++++++ 5 files changed, 84 insertions(+) create mode 100644 common/boot_fit.c create mode 100644 include/boot_fit.h
diff --git a/common/Kconfig b/common/Kconfig index 1879aef..2429953 100644 --- a/common/Kconfig +++ b/common/Kconfig @@ -421,6 +421,14 @@ config SYS_STDIO_DEREGISTER
endmenu
+config FIT_EMBED + bool "Support a FIT image embedded in the U-boot image" + default n + help + This option provides hooks to allow U-boot to parse an + appended FIT image and enable board specific code to then select + the correct DTB to be used. + config DEFAULT_FDT_FILE string "Default fdt file" help diff --git a/common/Makefile b/common/Makefile index ccd8bbc..0c6209b 100644 --- a/common/Makefile +++ b/common/Makefile @@ -151,6 +151,7 @@ obj-y += image.o obj-$(CONFIG_ANDROID_BOOT_IMAGE) += image-android.o obj-$(CONFIG_$(SPL_)OF_LIBFDT) += image-fdt.o obj-$(CONFIG_$(SPL_)FIT) += image-fit.o +obj-$(CONFIG_FIT_EMBED) += boot_fit.o common_fit.o obj-$(CONFIG_$(SPL_)FIT_SIGNATURE) += image-sig.o obj-$(CONFIG_IO_TRACE) += iotrace.o obj-y += memsize.o diff --git a/common/boot_fit.c b/common/boot_fit.c new file mode 100644 index 0000000..ff26cf7 --- /dev/null +++ b/common/boot_fit.c @@ -0,0 +1,58 @@ +/* + * (C) Copyright 2017 + * Texas Instruments, <www.ti.com> + * + * Franklin S Cooper Jr. fcooper@ti.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <boot_fit.h> +#include <common.h> +#include <errno.h> +#include <image.h> +#include <libfdt.h> + +int fdt_offset(void *fit) +{ + int fdt_offset, fdt_len; + int images; + + images = fdt_path_offset(fit, FIT_IMAGES_PATH); + if (images < 0) { + debug("%s: Cannot find /images node: %d\n", __func__, images); + return -1; + } + + /* Figure out which device tree the board wants to use */ + fdt_len = fit_select_fdt(fit, images, &fdt_offset); + + if (fdt_len < 0) + return fdt_len; + + return fdt_offset; +} + +void *locate_dtb_in_fit(void *fit) +{ + struct image_header *header; + int size; + int ret; + + size = fdt_totalsize(fit); + size = (size + 3) & ~3; + + header = (struct image_header *)fit; + + if (image_get_magic(header) != FDT_MAGIC) { + debug("No FIT image appended to U-boot\n"); + return NULL; + } + + ret = fdt_offset(fit); + + if (ret <= 0) + return NULL; + else + return (void *)fit+size+ret; +} diff --git a/include/boot_fit.h b/include/boot_fit.h new file mode 100644 index 0000000..b7d2462 --- /dev/null +++ b/include/boot_fit.h @@ -0,0 +1,9 @@ +/* + * Copyright (C) 2017 Texas Instruments + * Written by Franklin Cooper Jr. fcooper@ti.com + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +int fdt_offset(void *fit); +void *locate_dtb_in_fit(void *fit); diff --git a/include/image.h b/include/image.h index 3f26f9b..1083578 100644 --- a/include/image.h +++ b/include/image.h @@ -18,6 +18,7 @@
#include "compiler.h" #include <asm/byteorder.h> +#include <linux/kconfig.h>
/* Define this to avoid #ifdefs later on */ struct lmb; @@ -1274,6 +1275,13 @@ int board_fit_config_name_match(const char *name); void board_fit_image_post_process(void **p_image, size_t *p_size); #endif /* CONFIG_SPL_FIT_IMAGE_POST_PROCESS */
+#if IS_ENABLED(CONFIG_SPL_LOAD_FIT) || IS_ENABLED(CONFIG_FIT_EMBED) + +ulong fdt_getprop_u32(const void *fdt, int node, const char *prop); +int fit_select_fdt(const void *fdt, int images, int *fdt_offsetp); + +#endif + /** * Mapping of image types to function handlers to be invoked on the associated * loaded images