This commit adds BR2_DOWNLOAD_FORCE_CHECK_HASHES=y in the defconfig and adds custom hash files. The exception entry in .checkpackageignore is also removed. Signed-off-by: Scott Fan <fancp2007@gmail.com> [Julien: change linux.hash comment to reuse hash from upstream] Signed-off-by: Julien Olivain <ju.o@free.fr>