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root@debian-armhf:~# lsblk
NAME         MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda            8:0    1   3.8G  0 disk
├─sda1         8:1    1    64M  0 part
└─sda2         8:2    1   3.7G  0 part
mmcblk1boot0 179:16   0     1M  1 disk
mmcblk1boot1 179:24   0     1M  1 disk
mmcblk0      179:0    0   7.4G  0 disk
├─mmcblk0p1  179:1    0     1M  0 part /boot/uboot
└─mmcblk0p2  179:2    0   7.4G  0 part /
mmcblk1      179:8    0   1.8G  0 disk
├─mmcblk1p1  179:9    0  70.6M  0 part
└─mmcblk1p2  179:10   0   1.7G  0 part



root@debian-armhf:~# cat /boot/uboot/uEnv.txt
optargs=fixrtc
loadfdt=ext4load mmc ${mmcdev}:2 ${fdtaddr} /boot/dtbs/${fdtfile}
loaduimage=mw.l 4804c134 fe1fffff; if ext4load mmc 0:2 ${loadaddr} /boot/zImage; then mw.l 4804c194 01200000; echo Booting from external microSD...; setenv mmcdev 0; else setenv mmcdev 1; if test $mmc0 = 1; then setenv mmcroot /dev/sda2 rw; fi; ext4load mmc 1:2 ${loadaddr} /boot/zImage && mw.l 4804c194 00c00000; echo Booting from internal eMMC...; fi
mmcboot=run mmcargs; bootz ${loadaddr} - ${fdtaddr}
uenvcmd=i2c mw 0x24 1 0x3e; run findfdt; if test $board_name = A335BNLT; then setenv mmcdev 1; mmc dev ${mmcdev}; if mmc rescan; then setenv mmc1 1; else setenv mmc1 0; fi; fi; setenv mmcdev 0; mmc dev ${mmcdev}; if mmc rescan; then setenv mmc0 1; else setenv mmc0 0; fi; run loaduimage && run loadfdt && run mmcboot




root@debian-armhf:~# mount /dev/sda2 /mnt
root@debian-armhf:~# cat /mnt/etc/fstab
proc /proc proc defaults 0 0
#/dev/mmcblk0p2      /              auto   errors=remount-ro   0   1
/dev/sda2            /             ext4      defaults          1      1
/dev/mmcblk0p1      /boot/uboot    auto   defaults            0   0