[PATCH 2/3] board: dragonboard410c: Fix fastboot

[Stephan Gerhold]

At the moment pressing the volume down key does not actually launch
fastboot. This is because setting "bootdelay" to "-1" actually
disables autoboot and drops to the U-Boot console. It does not execute
the "bootcmd".

The correct value for "bootdelay" here would be "-2", which disables
the delay and key checking and would immediately execute the "bootcmd".

However, even better in this case is using "preboot" to trigger Fastboot.
The advantage is that running "fastboot continue" will actually continue
the autoboot process instead of ending up in the U-Boot shell.

Also make sure to unset "preboot" again immediately in case the user
saves the environment after triggering fastboot.

Cc: Ramon Fried <rfried.dev at gmail.com>
Fixes: aa043ee91a47 ("db410c: automatically launch fastboot")
Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
---

 board/qualcomm/dragonboard410c/dragonboard410c.c | 3 +--
 configs/dragonboard410c_defconfig                | 1 +
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/board/qualcomm/dragonboard410c/dragonboard410c.c b/board/qualcomm/dragonboard410c/dragonboard410c.c
index 3b71881cac..371b3262f8 100644
--- a/board/qualcomm/dragonboard410c/dragonboard410c.c
+++ b/board/qualcomm/dragonboard410c/dragonboard410c.c
@@ -132,8 +132,7 @@ int misc_init_r(void)
 	}
 
 	if (dm_gpio_get_value(&resin)) {
-		env_set("bootdelay", "-1");
-		env_set("bootcmd", "fastboot 0");
+		env_set("preboot", "setenv preboot; fastboot 0");
 		printf("key_vol_down pressed - Starting fastboot.\n");
 	}
 
diff --git a/configs/dragonboard410c_defconfig b/configs/dragonboard410c_defconfig
index dc9d0d893c..a46283f980 100644
--- a/configs/dragonboard410c_defconfig
+++ b/configs/dragonboard410c_defconfig
@@ -10,6 +10,7 @@ CONFIG_DISTRO_DEFAULTS=y
 # CONFIG_ANDROID_BOOT_IMAGE is not set
 CONFIG_FIT=y
 CONFIG_OF_BOARD_SETUP=y
+CONFIG_USE_PREBOOT=y
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set
 CONFIG_MISC_INIT_R=y
-- 
2.32.0