[PATCH] imx: imx8mn_beacon: Fix USB booting

[Adam Ford]

The i.MX8M Nano can boot over USB using the boot ROM instead of
adding extra code to SPL to support USB drivers, etc.  However,
when booting from USB, the environment doesnt' know where to load
and causes a hang.  Fix this hang by supporting CONFIG_ENV_IS_NOWHERE=y.
It only falls back to this condition when booting from USB, so it
does not impact MMC booting.

Suggested-by: Michael Nazzareno Trimarchi <michael at amarulasolutions.com>
Signed-off-by: Adam Ford <aford173 at gmail.com>

diff --git a/configs/imx8mn_beacon_2g_defconfig b/configs/imx8mn_beacon_2g_defconfig
index 8b98d687ec..1766a43cce 100644
--- a/configs/imx8mn_beacon_2g_defconfig
+++ b/configs/imx8mn_beacon_2g_defconfig
@@ -66,6 +66,7 @@ CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_SPL_REMOVE_PROPS="interrupt-parent interrupts"
 CONFIG_ENV_OVERWRITE=y
+CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SYS_MMC_ENV_DEV=2
diff --git a/configs/imx8mn_beacon_defconfig b/configs/imx8mn_beacon_defconfig
index a707ee664e..8ac36121aa 100644
--- a/configs/imx8mn_beacon_defconfig
+++ b/configs/imx8mn_beacon_defconfig
@@ -66,6 +66,7 @@ CONFIG_CMD_FAT=y
 CONFIG_OF_CONTROL=y
 CONFIG_SPL_OF_CONTROL=y
 CONFIG_ENV_OVERWRITE=y
+CONFIG_ENV_IS_NOWHERE=y
 CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SYS_MMC_ENV_DEV=2
-- 
2.32.0