please stay on list...i'm no expert in fat-environment, only have some experience on out-of-partition environment-storage (env on mmc). This seems not your case...
i don't know if env_offset is used on fat (makes no sense in my eyes) and env_is_on_mmc is disabled
where did your fat-partition start? if it starts after 1M offset uboot should not overwrite itself with saveenv.
following your dd starts at 8k-offset and have which size (typically <1M)? your erase before cleans first 1M (except first 1k where partitiontable is located). why do you think the target-file should be hidden? imho it is a normal file on mmc 0 and maybe first fat-partition (auto-flag) named "uboot.env". you found the file on /?? this should not be a fat-partition. linux imho needs a partiton with permission-options (extx,reiser,...). i guess you mean additional fat-partition, maybe mounted to /boot.
maybe you can add some debug-messages in saveenv for fat (env/fat.c env_fat_save, fs/fat/fat_write.c file_fat_write)
regards Frank
Gesendet: Dienstag, 09. April 2019 um 23:21 Uhr Von: "U.Mutlu" for-gmane@mutluit.com $ ls -l u-boot-sunxi-with-spl.bin -rw-r--r-- 1 xy xy 479836 Apr 9 17:55 u-boot-sunxi-with-spl.bin
I used the following to write u-boot to the SD card (/dev/sdb):
# dd if=/dev/zero of=/dev/sdb bs=1k count=1023 seek=1 # dd if=u-boot-sunxi-with-spl.bin of=/dev/sdb bs=1024 seek=8
$ grep -i ENV_ .config CONFIG_ENV_SIZE=0x20000 CONFIG_ENV_OFFSET=0x88000 CONFIG_ENV_VARS_UBOOT_CONFIG=y # CONFIG_SYS_CONSOLE_ENV_OVERWRITE is not set # CONFIG_SPL_ENV_SUPPORT is not set CONFIG_CMD_ENV_EXISTS=y # CONFIG_CMD_ENV_CALLBACK is not set # CONFIG_CMD_ENV_FLAGS is not set # CONFIG_ENV_IS_IN_EEPROM is not set CONFIG_ENV_IS_IN_FAT=y # CONFIG_ENV_IS_IN_EXT4 is not set # CONFIG_ENV_IS_IN_FLASH is not set # CONFIG_ENV_IS_IN_MMC is not set # CONFIG_ENV_IS_IN_NAND is not set # CONFIG_ENV_IS_IN_NVRAM is not set # CONFIG_ENV_IS_IN_ONENAND is not set # CONFIG_ENV_IS_IN_REMOTE is not set # CONFIG_ENV_IS_IN_SPI_FLASH is not set # CONFIG_ENV_IS_IN_UBI is not set CONFIG_ENV_FAT_INTERFACE="mmc" CONFIG_ENV_FAT_DEVICE_AND_PART="0:auto" CONFIG_ENV_FAT_FILE="uboot.env" # CONFIG_USE_DEFAULT_ENV_FILE is not set # CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG is not set
$ grep ENV_FAT .config CONFIG_ENV_FAT_INTERFACE="mmc" CONFIG_ENV_FAT_DEVICE_AND_PART="0:auto" CONFIG_ENV_FAT_FILE="uboot.env"
I guess the uboot.env is a hidden file, but occassionally (esp. after saveenv & reboot) I see this file as a normal file in /, not hidden.
I used "Lamobo_R1_defconfig" as basis and made just a few irrelevant minor changes in make menuconfig. It's actually a Banana Pi R1 board. CONFIG_DEFAULT_DEVICE_TREE="sun7i-a20-lamobo-r1"