- default:
- return log_msg_ret("pref", -EINVAL);
- }
-
- fdt_fname = env_get("fdtfile");
- if (fdt_fname) {
- snprintf(fname, size, "%s/%s", prefix, fdt_fname);
- log_debug("Using device tree: %s\n", fname);
- } 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, "%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;
-}
-
/*
* distro_efi_try_bootflow_files() - Check that files are present
*
@@ -241,7 +185,7 @@ static int distro_efi_try_bootflow_files(struct
udevice *dev,
ret = -ENOENT;
*fname = '\0';
for (seq = 0; ret == -ENOENT; seq++) {
- ret = distro_efi_get_fdt_name(fname, sizeof(fname), seq);
+ ret = efi_get_distro_fdt_name(fname, sizeof(fname), seq);
if (ret == -EALREADY)
bflow->flags = BOOTFLOWF_USE_PRIOR_FDT;
if (!ret) {
@@ -340,7 +284,7 @@ static int distro_efi_read_bootflow_net(struct
bootflow *bflow)
sprintf(file_addr, "%lx", fdt_addr);
/* We only allow the first prefix with PXE */
- ret = distro_efi_get_fdt_name(fname, sizeof(fname), 0);
+ ret = efi_get_distro_fdt_name(fname, sizeof(fname), 0);
if (ret)
return log_msg_ret("nam", ret);
diff --git a/include/efi_loader.h b/include/efi_loader.h
index 0ac04990b8e..ed2b517b130 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -1187,4 +1187,6 @@ efi_status_t efi_disk_get_device_name(const
efi_handle_t handle, char *buf, int
*/
void efi_add_known_memory(void);
+int efi_get_distro_fdt_name(char *fname, int size, int seq);
+
#endif /* _EFI_LOADER_H */
diff --git a/lib/efi_loader/Makefile b/lib/efi_loader/Makefile
index 034e366967f..2af6f2066b5 100644
--- a/lib/efi_loader/Makefile
+++ b/lib/efi_loader/Makefile
@@ -59,6 +59,7 @@ obj-y += efi_device_path.o
obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_device_path_to_text.o
obj-$(CONFIG_EFI_DEVICE_PATH_UTIL) += efi_device_path_utilities.o
obj-y += efi_dt_fixup.o
+obj-y += efi_fdt.o
obj-y += efi_file.o
obj-$(CONFIG_EFI_LOADER_HII) += efi_hii.o
obj-y += efi_image_loader.o
diff --git a/lib/efi_loader/efi_fdt.c b/lib/efi_loader/efi_fdt.c
new file mode 100644
index 00000000000..0edf0c1e2fc
--- /dev/null
+++ b/lib/efi_loader/efi_fdt.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Bootmethod for distro boot via EFI
+ *
+ * Copyright 2021 Google LLC
+ * Written by Simon Glass <s...@chromium.org>
+ */
+
+#include <efi_loader.h>
+#include <env.h>
+#include <errno.h>
+#include <log.h>
+#include <string.h>
+#include <vsprintf.h>
+
+/**
+ * distro_efi_get_fdt_name() - get the filename for reading the .dtb
file
+ *
+ * @fname: buffer for filename
+ * @size: buffer size
+ * @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
+ */
+int efi_get_distro_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, "%s/%s", prefix, fdt_fname);
+ log_debug("Using device tree: %s\n", fname);
+ } 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, "%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;
+}
