Emmc got disabled accidentally..

Hi all,
I am newbie, and am using Beaglebone black (Rev. C with debian OS) for hobby development projects.
I wanted to use HDMI pins of BBB as GPIO, and hence I disabled it through uEnv.txt.
By mistake I also disabled “BB-BONE-EMMC-2G” along with “BB-BONELT-HDMI,BB-BONELT-HDMIN”.
Now i can boot BBB using SD card image, but i want to rechange settings to boot from emmc.
I have my software codes in emmc, and i don’t want to lose them. Can anyone tell how can i boot from emmc, or access emmc data when boot from SD card?

Thanks in advance.