2014-03-26, 01:02
If you have boot=/dev/mmcblk0p1 (ie. the SD card) then you can use the "easy" update solution of dropping the new tar into the update folder and rebooting. However if you are "booting" from some other device (nfs, smb, usb) then you can't use this method and must update your installation yourself by picking apart the files from with the tar and copying to the correct location. There really is no benefit to not booting from the SD card, just plenty of downside.