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https://github.com/smaeul/u-boot.git
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d9409244b3
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>
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Bootmethod for booting via a U-Boot script
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*
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* Copyright 2021 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#define LOG_CATEGORY UCLASS_BOOTSTD
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#include <common.h>
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#include <blk.h>
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#include <bootflow.h>
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#include <bootmeth.h>
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#include <bootstd.h>
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#include <dm.h>
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#include <env.h>
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#include <fs.h>
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#include <image.h>
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#include <malloc.h>
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#include <mapmem.h>
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#define SCRIPT_FNAME1 "boot.scr.uimg"
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#define SCRIPT_FNAME2 "boot.scr"
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static int script_check(struct udevice *dev, struct bootflow_iter *iter)
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{
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int ret;
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/* This only works on block devices */
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ret = bootflow_iter_uses_blk_dev(iter);
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if (ret)
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return log_msg_ret("blk", ret);
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return 0;
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}
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static int script_read_bootflow(struct udevice *dev, struct bootflow *bflow)
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{
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struct blk_desc *desc = NULL;
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const char *const *prefixes;
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struct udevice *bootstd;
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const char *prefix;
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int ret, i;
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ret = uclass_first_device_err(UCLASS_BOOTSTD, &bootstd);
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if (ret)
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return log_msg_ret("std", ret);
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/* We require a partition table */
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if (!bflow->part)
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return -ENOENT;
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if (bflow->blk)
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desc = dev_get_uclass_plat(bflow->blk);
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prefixes = bootstd_get_prefixes(bootstd);
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i = 0;
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do {
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prefix = prefixes ? prefixes[i] : NULL;
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ret = bootmeth_try_file(bflow, desc, prefix, SCRIPT_FNAME1);
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if (ret)
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ret = bootmeth_try_file(bflow, desc, prefix,
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SCRIPT_FNAME2);
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} while (ret && prefixes && prefixes[++i]);
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if (ret)
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return log_msg_ret("try", ret);
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bflow->subdir = strdup(prefix ? prefix : "");
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if (!bflow->subdir)
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return log_msg_ret("prefix", -ENOMEM);
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ret = bootmeth_alloc_file(bflow, 0x10000, 1);
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if (ret)
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return log_msg_ret("read", ret);
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return 0;
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}
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static int script_boot(struct udevice *dev, struct bootflow *bflow)
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{
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struct blk_desc *desc = dev_get_uclass_plat(bflow->blk);
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ulong addr;
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int ret;
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ret = env_set("devtype", blk_get_devtype(bflow->blk));
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if (!ret)
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ret = env_set_hex("devnum", desc->devnum);
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if (!ret)
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ret = env_set("prefix", bflow->subdir);
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if (!ret && IS_ENABLED(CONFIG_ARCH_SUNXI) &&
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!strcmp("mmc", blk_get_devtype(bflow->blk)))
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ret = env_set_hex("mmc_bootdev", desc->devnum);
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if (ret)
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return log_msg_ret("env", ret);
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log_debug("devtype: %s\n", env_get("devtype"));
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log_debug("devnum: %s\n", env_get("devnum"));
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log_debug("prefix: %s\n", env_get("prefix"));
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log_debug("mmc_bootdev: %s\n", env_get("mmc_bootdev"));
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addr = map_to_sysmem(bflow->buf);
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ret = image_source_script(addr, NULL);
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if (ret)
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return log_msg_ret("boot", ret);
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return 0;
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}
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static int script_bootmeth_bind(struct udevice *dev)
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{
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struct bootmeth_uc_plat *plat = dev_get_uclass_plat(dev);
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plat->desc = IS_ENABLED(CONFIG_BOOTSTD_FULL) ?
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"Script boot from a block device" : "script";
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return 0;
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}
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static struct bootmeth_ops script_bootmeth_ops = {
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.check = script_check,
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.read_bootflow = script_read_bootflow,
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.read_file = bootmeth_common_read_file,
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.boot = script_boot,
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};
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static const struct udevice_id script_bootmeth_ids[] = {
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{ .compatible = "u-boot,script" },
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{ }
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};
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U_BOOT_DRIVER(bootmeth_script) = {
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.name = "bootmeth_script",
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.id = UCLASS_BOOTMETH,
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.of_match = script_bootmeth_ids,
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.ops = &script_bootmeth_ops,
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.bind = script_bootmeth_bind,
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};
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