Just a note:sparc arch removal also affected some SPARC-specific packages[1] (e. g., "SILO" bootloader).
According to Aurelien Jarno,[2] they should be re-uploaded to "unreleased". [1] http://lists.debian.org/debian-sparc/2015/07/msg00037.html [2] http://lists.debian.org/debian-sparc/2015/08/msg00018.html -- Best wishes, Bob