diff options
author | Simon Glass <sjg@chromium.org> | 2023-02-22 22:17:04 +0300 |
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committer | Simon Glass <sjg@chromium.org> | 2023-03-08 22:40:49 +0300 |
commit | 47dd6b4d7daba06a04bb612d0c19e350e6287fac (patch) | |
tree | e68de28980fa5672afed9428bd13e9454b88a811 /boot/bootmeth_efi.c | |
parent | 4f806f31fc29b30f06bd13abe44a1d3649d480e5 (diff) | |
download | u-boot-47dd6b4d7daba06a04bb612d0c19e350e6287fac.tar.xz |
bootstd: Replicate the dtb-filename quirks of distroboot
For EFI, the distro boot scripts search in three different directories
for the .dtb file. The SOC-based filename fallback is supported only for
32-bit ARM.
Adjust the code to mirror this behaviour.
Also some boards can use a prior-stage FDT if one is not found in the
normal way. Support this and show a message in that case.
Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Mark Kettenis <kettenis@openbsd.org>
Diffstat (limited to 'boot/bootmeth_efi.c')
-rw-r--r-- | boot/bootmeth_efi.c | 70 |
1 files changed, 61 insertions, 9 deletions
diff --git a/boot/bootmeth_efi.c b/boot/bootmeth_efi.c index 67c972e3fe..6a97ac02ff 100644 --- a/boot/bootmeth_efi.c +++ b/boot/bootmeth_efi.c @@ -147,25 +147,60 @@ static int distro_efi_check(struct udevice *dev, struct bootflow_iter *iter) return 0; } -static void distro_efi_get_fdt_name(char *fname, int size) +/** + * distro_efi_get_fdt_name() - Get the filename for reading the .dtb file + * + * @fname: Place to put filename + * @size: Max size of filename + * @seq: Sequence number, to cycle through options (0=first) + * Returns: 0 on success, -ENOENT if the "fdtfile" env var does not exist, + * -EINVAL if there are no more options, -EALREADY if the control FDT should be + * used + */ +static int distro_efi_get_fdt_name(char *fname, int size, int seq) { const char *fdt_fname; + const char *prefix; + + /* select the prefix */ + switch (seq) { + case 0: + /* this is the default */ + prefix = "/dtb"; + break; + case 1: + prefix = ""; + break; + case 2: + prefix = "/dtb/current"; + break; + default: + return log_msg_ret("pref", -EINVAL); + } fdt_fname = env_get("fdtfile"); if (fdt_fname) { - snprintf(fname, size, "dtb/%s", fdt_fname); + snprintf(fname, size, "%s/%s", prefix, fdt_fname); log_debug("Using device tree: %s\n", fname); - } else { + } else if (IS_ENABLED(CONFIG_OF_HAS_PRIOR_STAGE)) { + strcpy(fname, "<prior>"); + return log_msg_ret("pref", -EALREADY); + /* Use this fallback only for 32-bit ARM */ + } else if (IS_ENABLED(CONFIG_ARM) && !IS_ENABLED(CONFIG_ARM64)) { const char *soc = env_get("soc"); const char *board = env_get("board"); const char *boardver = env_get("boardver"); /* cf the code in label_boot() which seems very complex */ - snprintf(fname, size, "dtb/%s%s%s%s.dtb", + snprintf(fname, size, "%s/%s%s%s%s.dtb", prefix, soc ? soc : "", soc ? "-" : "", board ? board : "", boardver ? boardver : ""); log_debug("Using default device tree: %s\n", fname); + } else { + return log_msg_ret("env", -ENOENT); } + + return 0; } static int distro_efi_read_bootflow_file(struct udevice *dev, @@ -174,7 +209,7 @@ static int distro_efi_read_bootflow_file(struct udevice *dev, struct blk_desc *desc = NULL; ulong fdt_addr, size; char fname[256]; - int ret; + int ret, seq; /* We require a partition table */ if (!bflow->part) @@ -196,13 +231,26 @@ static int distro_efi_read_bootflow_file(struct udevice *dev, if (ret) return log_msg_ret("read", -EINVAL); - distro_efi_get_fdt_name(fname, sizeof(fname)); + fdt_addr = env_get_hex("fdt_addr_r", 0); + + /* try the various available names */ + ret = -ENOENT; + for (seq = 0; ret; seq++) { + ret = distro_efi_get_fdt_name(fname, sizeof(fname), seq); + if (ret == -EALREADY) { + bflow->flags = BOOTFLOWF_USE_PRIOR_FDT; + break; + } + if (ret) + return log_msg_ret("nam", ret); + ret = bootmeth_common_read_file(dev, bflow, fname, fdt_addr, + &size); + } + bflow->fdt_fname = strdup(fname); if (!bflow->fdt_fname) return log_msg_ret("fil", -ENOMEM); - fdt_addr = env_get_hex("fdt_addr_r", 0); - ret = bootmeth_common_read_file(dev, bflow, fname, fdt_addr, &size); if (!ret) { bflow->fdt_size = size; bflow->fdt_addr = fdt_addr; @@ -277,7 +325,11 @@ static int distro_efi_read_bootflow_net(struct bootflow *bflow) fdt_addr = hextoul(fdt_addr_str, NULL); sprintf(file_addr, "%lx", fdt_addr); - distro_efi_get_fdt_name(fname, sizeof(fname)); + /* We only allow the first prefix with PXE */ + ret = distro_efi_get_fdt_name(fname, sizeof(fname), 0); + if (ret) + return log_msg_ret("nam", ret); + bflow->fdt_fname = strdup(fname); if (!bflow->fdt_fname) return log_msg_ret("fil", -ENOMEM); |