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The following settings were made to save the u-boot env to eMMC. U-Boot 2022.01 CONFIG_ENV_IS_IN_MMC=y CONFIG_SYS_MMC_ENV_DEV=0 CONFIG_SYS_MMC_ENV_PART=0 The write operation succeeds once, but then the eMMC stops responding. Writing by ums is also successful, so writing itself seems to be OK, but there seems to be a problem in the subsequent operation. What are the problems with writing to eMMC?