Customising SD card Booting for BBB

Hi sir
i am new to the Beaglebone Black board, here i have a doubt on SD card booting.

i able to build U-boot and kernel source codes with cross compiler,
after that what are needed for sd boot. https://www.digikey.com/eewiki/display/linuxonarm/BeagleBone+Black (i cant understand here the process)
could you please send the customising SD card booting documentation to my Mail.
and suggest preferable U-Boot, Kernel and cross compiler.

Thanks
Harish

@harish, In that case, please feel free to use the Monthly and Weekly generated images that are linked from here:

https://elinux.org/Beagleboard:BeagleBoneBlack_Debian

The Monthly images are based on Debian Stretch (9.x):
https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Debian_9_.28Stretch.29_-_Monthly

While the Weekly images are based on Debian Buster (10.x):
https://elinux.org/Beagleboard:BeagleBoneBlack_Debian#Debian_10_.28Buster.29_-_Weekly

Use https://www.balena.io/etcher/ to write the *.img.xz to a microSD card…

Regards,