[PATCH 2/2] configs: airoha: an7581: disable ENV_IS_IN_MTD to avoid boot panic

[Mikhail Kshevetskiy]

Booting image generated with

  make an7581_evb_defconfig

will results in

  U-Boot 2026.04-00924-gfb815bd8793b (Apr 27 2026 - 15:08:30 +0300)

  CPU:   Airoha AN7581
  DRAM:  512 MiB
  Core:  35 devices, 19 uclasses, devicetree: separate
  MMC:   mmc at 1fa0e000: 0
  Loading Environment from MMC... *** Warning - No block device, using default environment

  Loading Environment from MTD... *** Warning - get_mtd_device_nm() failed, using default environment

  BUG at drivers/mtd/mtdcore.c:898/__put_mtd_device()!
  BUG!
  resetting ...

This happens because no any mtd partition defined in dts/mtdparts.
Disabling of ENV_IS_IN_MTD fixes an issue.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy at iopsys.eu>
---
 configs/an7581_evb_defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/configs/an7581_evb_defconfig b/configs/an7581_evb_defconfig
index 16100d00f98..a0afe249ce5 100644
--- a/configs/an7581_evb_defconfig
+++ b/configs/an7581_evb_defconfig
@@ -43,6 +43,7 @@ CONFIG_CMD_LOG=y
 CONFIG_OF_UPSTREAM=y
 CONFIG_ENV_OVERWRITE=y
 CONFIG_ENV_IS_IN_MMC=y
+# CONFIG_ENV_IS_IN_MTD is not set
 CONFIG_ENV_RELOC_GD_ENV_ADDR=y
 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
 CONFIG_NET_RANDOM_ETHADDR=y
-- 
2.53.0