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When grub2 (i386-pc) is built with -O2 or -O3 it is unable to boot and the system will reboot in a loop. Tony Battersby has bisected [0] the error down to this security bugfix: boot/grub2/0132-kern-parser-Fix-a-stack-buffer-overflow.patch There is also a bug report by Peter Seiderer about this [1]. As discussed on the mailing list [2], this patch introduces a workaround in the grub2.mk overriding the global optimization settings with -Os which results in a booting system. References: [0] https://savannah.gnu.org/bugs/?60458 [1] https://bugs.busybox.net/show_bug.cgi?id=13586 [2] http://lists.busybox.net/pipermail/buildroot/2021-May/311524.html Signed-off-by: Andreas Hilse <andreas.hilse@googlemail.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>