efi: Allow easy selection of serial-only operation

Add info about how to select vidconsole or serial.

Also set up a demo boot command.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/include/configs/efi-x86_app.h b/include/configs/efi-x86_app.h
index 6061a6d..33afb7c 100644 (file)
--- a/include/configs/efi-x86_app.h
+++ b/include/configs/efi-x86_app.h
@@ -10,8 +10,33 @@
 
 #undef CONFIG_TPM_TIS_BASE_ADDRESS
 
+/*
+ * Select the output device: Put an 'x' prefix before one of these to disable it
+ */
+
+/*
+ * Video output - can normally continue after exit_boot_services has been
+ * called, since output to the display does not require EFI services at that
+ * point. U-Boot sets up the console memory and does its own drawing.
+ */
 #define CONFIG_STD_DEVICES_SETTINGS    "stdin=serial\0" \
                                        "stdout=vidconsole\0" \
                                        "stderr=vidconsole\0"
 
+/*
+ * Serial output with no console. Run qemu with:
+ *
+ *    -display none -serial mon:stdio
+ *
+ * This will hang or fail to output on the console after exit_boot_services is
+ * called.
+ */
+#define xCONFIG_STD_DEVICES_SETTINGS   "stdin=serial\0" \
+                                       "stdout=serial\0" \
+                                       "stderr=serial\0"
+
+#undef CONFIG_BOOTCOMMAND
+
+#define CONFIG_BOOTCOMMAND "part list efi 0; fatls efi 0:1"
+
 #endif