[PATCH v4 3/4] bootflow: bootmeth_efi: Handle fdt not available.

[Shantur Rathore]

While booting with efi, if fdt isn't available externally,
just use the built-in one.

Reviewed-by: Simon Glass <sjg at chromium.org>

Signed-off-by: Shantur Rathore <i at shantur.com>
---

Changes in v4:
- Update code to use BUILT_IN_FDT flag as suggested

 boot/bootmeth_efi.c | 19 +++++++++++++------
 include/bootflow.h  |  2 ++
 2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/boot/bootmeth_efi.c b/boot/bootmeth_efi.c
index fd224f7c91..e884dc6293 100644
--- a/boot/bootmeth_efi.c
+++ b/boot/bootmeth_efi.c
@@ -313,6 +313,7 @@ static int distro_efi_try_bootflow_files(struct udevice *dev,
 		 */
 	} else {
 		log_debug("No device tree available\n");
+		bflow->flags |= BOOTFLOWF_USE_BUILTIN_FDT;
 	}
 
 	return 0;
@@ -391,6 +392,7 @@ static int distro_efi_read_bootflow_net(struct bootflow *bflow)
 		bflow->fdt_addr = fdt_addr;
 	} else {
 		log_debug("No device tree available\n");
+		bflow->flags |= BOOTFLOWF_USE_BUILTIN_FDT;
 	}
 
 	bflow->state = BOOTFLOWST_READY;
@@ -429,13 +431,11 @@ static int distro_efi_boot(struct udevice *dev, struct bootflow *bflow)
 			return log_msg_ret("read", ret);
 
 		/*
-		 * use the provided device tree if available, else fall back to
-		 * the control FDT
+		 * use the provided device tree if not using the built-in fdt
 		 */
-		if (bflow->fdt_fname)
+		if (bflow->flags & ~BOOTFLOWF_USE_BUILTIN_FDT)
 			fdt = bflow->fdt_addr;
-		else
-			fdt = (ulong)map_to_sysmem(gd->fdt_blob);
+
 	} else {
 		/*
 		 * This doesn't actually work for network devices:
@@ -452,7 +452,14 @@ static int distro_efi_boot(struct udevice *dev, struct bootflow *bflow)
 	 * At some point we can add a real interface to bootefi so we can call
 	 * this directly. For now, go through the CLI, like distro boot.
 	 */
-	snprintf(cmd, sizeof(cmd), "bootefi %lx %lx", kernel, fdt);
+	if (bflow->flags & BOOTFLOWF_USE_BUILTIN_FDT) {
+		log_debug("Booting with built-in fdt\n");
+		snprintf(cmd, sizeof(cmd), "bootefi %lx", kernel);
+	} else {
+		log_debug("Booting with external fdt\n");
+		snprintf(cmd, sizeof(cmd), "bootefi %lx %lx", kernel, fdt);
+	}
+
 	if (run_command(cmd, 0))
 		return log_msg_ret("run", -EINVAL);
 
diff --git a/include/bootflow.h b/include/bootflow.h
index fede8f22a2..42112874f6 100644
--- a/include/bootflow.h
+++ b/include/bootflow.h
@@ -45,10 +45,12 @@ enum bootflow_state_t {
  *	CONFIG_OF_HAS_PRIOR_STAGE is enabled
  * @BOOTFLOWF_STATIC_BUF: Indicates that @bflow->buf is statically set, rather
  *	than being allocated by malloc().
+ * @BOOTFLOWF_USE_BUILTIN_FDT : Indicates that current bootflow uses built-in FDT
  */
 enum bootflow_flags_t {
 	BOOTFLOWF_USE_PRIOR_FDT	= 1 << 0,
 	BOOTFLOWF_STATIC_BUF	= 1 << 1,
+	BOOTFLOWF_USE_BUILTIN_FDT	= 1 << 2,
 };
 
 /**
-- 
2.40.1