Add a bootmeth driver which handles distro boot from a disk via a U-Boot script, so we can boot a bootflow using this commonly used mechanism. This is required by Armbian, for example.
Signed-off-by: Simon Glass sjg@chromium.org ---
(no changes since v4)
Changes in v4: - Allow use without a block device
Changes in v3: - Add support for script boot
boot/Kconfig | 11 ++++ boot/Makefile | 1 + boot/bootmeth_script.c | 139 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 151 insertions(+) create mode 100644 boot/bootmeth_script.c
diff --git a/boot/Kconfig b/boot/Kconfig index 373871c49a6..64e16f3beba 100644 --- a/boot/Kconfig +++ b/boot/Kconfig @@ -377,6 +377,17 @@ config BOOTMETH_SANDBOX This is a sandbox bootmeth driver used for testing. It always returns -ENOTSUPP when attempting to boot.
+config BOOTMETH_SCRIPT + bool "Bootdev support for U-Boot scripts" + default y if BOOTSTD_FULL + help + Enables support for booting a distro via a U-Boot script. This makes + the bootdevs look for a 'boot/boot.scr' file which can be used to + boot the distro. + + This provides a way to try out standard boot on an existing boot flow. + It is not enabled by default to save space. + endif
config LEGACY_IMAGE_FORMAT diff --git a/boot/Makefile b/boot/Makefile index 444e6975f10..a70674259c1 100644 --- a/boot/Makefile +++ b/boot/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_DISTRO) += bootmeth_distro.o obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_DISTRO_PXE) += bootmeth_pxe.o obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_EFILOADER) += bootmeth_efi.o obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_SANDBOX) += bootmeth_sandbox.o +obj-$(CONFIG_$(SPL_TPL_)BOOTMETH_SCRIPT) += bootmeth_script.o ifdef CONFIG_$(SPL_TPL_)BOOTSTD_FULL obj-$(CONFIG_$(SPL_TPL_)CMD_BOOTEFI_BOOTMGR) += bootmeth_efi_mgr.o endif diff --git a/boot/bootmeth_script.c b/boot/bootmeth_script.c new file mode 100644 index 00000000000..d1c3f940037 --- /dev/null +++ b/boot/bootmeth_script.c @@ -0,0 +1,139 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Bootmethod for booting via a U-Boot script + * + * Copyright 2021 Google LLC + * Written by Simon Glass sjg@chromium.org + */ + +#define LOG_CATEGORY UCLASS_BOOTSTD + +#include <common.h> +#include <blk.h> +#include <bootflow.h> +#include <bootmeth.h> +#include <bootstd.h> +#include <dm.h> +#include <env.h> +#include <fs.h> +#include <image.h> +#include <malloc.h> +#include <mapmem.h> + +#define SCRIPT_FNAME1 "boot.scr.uimg" +#define SCRIPT_FNAME2 "boot.scr" + +static int script_check(struct udevice *dev, struct bootflow_iter *iter) +{ + int ret; + + /* This only works on block devices */ + ret = bootflow_iter_uses_blk_dev(iter); + if (ret) + return log_msg_ret("blk", ret); + + return 0; +} + +static int script_read_bootflow(struct udevice *dev, struct bootflow *bflow) +{ + struct blk_desc *desc = NULL; + const char *const *prefixes; + struct udevice *bootstd; + const char *prefix; + int ret, i; + + ret = uclass_first_device_err(UCLASS_BOOTSTD, &bootstd); + if (ret) + return log_msg_ret("std", ret); + + /* We require a partition table */ + if (!bflow->part) + return -ENOENT; + + if (bflow->blk) + desc = dev_get_uclass_plat(bflow->blk); + + prefixes = bootstd_get_prefixes(bootstd); + i = 0; + do { + prefix = prefixes ? prefixes[i] : NULL; + + ret = bootmeth_try_file(bflow, desc, prefix, SCRIPT_FNAME1); + if (ret) + ret = bootmeth_try_file(bflow, desc, prefix, + SCRIPT_FNAME2); + } while (ret && prefixes && prefixes[++i]); + if (ret) + return log_msg_ret("try", ret); + + bflow->subdir = strdup(prefix ? prefix : ""); + if (!bflow->subdir) + return log_msg_ret("prefix", -ENOMEM); + + ret = bootmeth_alloc_file(bflow, 0x10000, 1); + if (ret) + return log_msg_ret("read", ret); + + return 0; +} + +static int script_boot(struct udevice *dev, struct bootflow *bflow) +{ + struct blk_desc *desc = dev_get_uclass_plat(bflow->blk); + ulong addr; + int ret; + + ret = env_set("devtype", blk_get_devtype(bflow->blk)); + if (!ret) + ret = env_set_hex("devnum", desc->devnum); + if (!ret) + ret = env_set("prefix", bflow->subdir); + if (!ret && IS_ENABLED(CONFIG_ARCH_SUNXI) && + !strcmp("mmc", blk_get_devtype(bflow->blk))) + ret = env_set_hex("mmc_bootdev", desc->devnum); + if (ret) + return log_msg_ret("env", ret); + + log_debug("devtype: %s\n", env_get("devtype")); + log_debug("devnum: %s\n", env_get("devnum")); + log_debug("prefix: %s\n", env_get("prefix")); + log_debug("mmc_bootdev: %s\n", env_get("mmc_bootdev")); + + addr = map_to_sysmem(bflow->buf); + ret = image_source_script(addr, NULL); + if (ret) + return log_msg_ret("boot", ret); + + return 0; +} + +static int script_bootmeth_bind(struct udevice *dev) +{ + struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev); + + plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ? + "Script boot from a block device" : "script"; + + return 0; +} + +static struct bootmeth_ops script_bootmeth_ops = { + .check = script_check, + .read_bootflow = script_read_bootflow, + .read_file = bootmeth_common_read_file, + .boot = script_boot, +}; + +static const struct udevice_id script_bootmeth_ids[] = { + { .compatible = "u-boot,script" }, + { } +}; + +U_BOOT_DRIVER(bootmeth_script) = { + .name = "bootmeth_script", + .id = UCLASS_BOOTMETH, + .of_match = script_bootmeth_ids, + .ops = &script_bootmeth_ops, + .bind = script_bootmeth_bind, +};