Add the initial bootmeth_openwrt driver with: - UCLASS_BOOTMETH driver, compatible "u-boot,openwrt" - check(): accept block devices via bootflow_iter_check_blk() - bind(): set BOOTMETHF_ANY_PART so bootstd iterates all partitions without requiring a filesystem - read_bootflow(): stub returning -ENOENT - boot(): stub returning -ENOSYS - Kconfig: CONFIG_BOOTMETH_OPENWRT depending on FIT, BOOTSTD, BOOTM_STORAGE
This is the foundation for booting OpenWrt-style uImage.FIT firmware images stored directly on raw storage partitions. The bootmeth will delegate actual image loading to the existing bootm storage path via image_loader. Signed-off-by: Daniel Golle <[email protected]> --- boot/Kconfig | 13 +++++++++ boot/Makefile | 1 + boot/bootmeth_openwrt.c | 65 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 79 insertions(+) create mode 100644 boot/bootmeth_openwrt.c diff --git a/boot/Kconfig b/boot/Kconfig index efc06f3cd1a..d8c7b8360ac 100644 --- a/boot/Kconfig +++ b/boot/Kconfig @@ -585,6 +585,19 @@ config BOOTMETH_CROS Note that only x86 devices are supported at present. +config BOOTMETH_OPENWRT + bool "Bootdev support for OpenWrt" + depends on FIT + depends on BOOTSTD + depends on BOOTM_STORAGE + help + Enables support for booting OpenWrt-style uImage.FIT firmware + images stored directly on raw storage (block device partitions, + MTD partitions, or UBI volumes). The boot method loads the FIT + metadata, selectively reads only the kernel and FDT sub-images + from storage, and skips filesystem sub-images that Linux maps + directly from flash. + config BOOTMETH_EXTLINUX bool "Bootdev support for extlinux boot" select PXE_UTILS diff --git a/boot/Makefile b/boot/Makefile index 7d1d4a28106..7b42358eb0c 100644 --- a/boot/Makefile +++ b/boot/Makefile @@ -72,6 +72,7 @@ obj-$(CONFIG_$(PHASE_)BOOTMETH_VBE_SIMPLE_FW) += vbe_simple_fw.o obj-$(CONFIG_$(PHASE_)BOOTMETH_VBE_SIMPLE_OS) += vbe_simple_os.o obj-$(CONFIG_$(PHASE_)BOOTMETH_ANDROID) += bootmeth_android.o +obj-$(CONFIG_$(PHASE_)BOOTMETH_OPENWRT) += bootmeth_openwrt.o obj-$(CONFIG_IMAGE_LOADER) += image-loader.o obj-$(CONFIG_IMAGE_LOADER_BLK) += image-loader-blk.o diff --git a/boot/bootmeth_openwrt.c b/boot/bootmeth_openwrt.c new file mode 100644 index 00000000000..02bf543031b --- /dev/null +++ b/boot/bootmeth_openwrt.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Bootmethod for OpenWrt + * + * Copyright (C) 2026 Daniel Golle <[email protected]> + */ + +#define LOG_CATEGORY UCLASS_BOOTSTD + +#include <blk.h> +#include <bootdev.h> +#include <bootflow.h> +#include <bootm.h> +#include <bootmeth.h> +#include <dm.h> +#include <image-loader.h> +#include <malloc.h> +#include <mapmem.h> + +static int openwrt_check(struct udevice *dev, struct bootflow_iter *iter) +{ + if (bootflow_iter_check_blk(iter)) + return log_msg_ret("blk", -EOPNOTSUPP); + + return 0; +} + +static int openwrt_read_bootflow(struct udevice *dev, struct bootflow *bflow) +{ + return log_msg_ret("nyi", -ENOENT); +} + +static int openwrt_boot(struct udevice *dev, struct bootflow *bflow) +{ + return log_msg_ret("nyi", -ENOSYS); +} + +static int openwrt_bootmeth_bind(struct udevice *dev) +{ + struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev); + + plat->desc = "OpenWrt"; + plat->flags = BOOTMETHF_ANY_PART; + + return 0; +} + +static struct bootmeth_ops openwrt_bootmeth_ops = { + .check = openwrt_check, + .read_bootflow = openwrt_read_bootflow, + .boot = openwrt_boot, +}; + +static const struct udevice_id openwrt_bootmeth_ids[] = { + { .compatible = "u-boot,openwrt" }, + { } +}; + +U_BOOT_DRIVER(bootmeth_openwrt) = { + .name = "bootmeth_openwrt", + .id = UCLASS_BOOTMETH, + .of_match = openwrt_bootmeth_ids, + .ops = &openwrt_bootmeth_ops, + .bind = openwrt_bootmeth_bind, +}; -- 2.53.0
