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I am basically from a background of small microcontrollers(arm7,cortex-m series). As I started working with a cortex a8 board(beagleboard xm), I always wonder how to store applications in flash/ram memory. In small controllers, you will directly give the location(which you know either flash or ram), but whensoever I store an application /home/root which memory is it stored?
Basically where the rootfile system is located in memory?
As is the same with Linux on full-size machines, the bootloader passes the location of the root as the root argument to the kernel. The bootloader itself (usually Das u-Boot) is responsible for checking NOR flash, NAND flash, SD, USB, SATA, PXE, etc. to see if a kernel and optional initrd can be found, and passing options as defined in the board's environment variables.
TL;DR: Check the bootloader configuration and kernel command line.
