On 29/03/17 00:39, Liang Yan wrote: > Looks there are two options to fix it: > > 1. add /* fall through*/ comment in source code, which follows level 3 rule. > > 2. add -Wno-implicit-fallthrough in Makefile cflags I chose option 1: http://git.ipxe.org/ipxe.git/commitdiff/5f85cbb Thanks, Michael