I'm using a DM500. I'm not very familiar with embedded PCs. I understand that the flash memory by default read-only. Directories like "/etc" are a part of the image file and cannot be modified. Other directories like "/var/etc" are writable but also retain their values after reboot.
1.) Where are the writable directories stored? In ram in a ram disk?
2.) If so, is the ram disk automatically written to flash memory?
3.) When you re-flash an image are the contents of the writable directories lost?