The test_jffs2 test fail for the same reason as test_ubi test with qemu >= 2.9 due to a qemu 2.8 bug. See commitd8447c38f5. Divide the erase block size by two. Fixes: https://gitlab.com/buildroot.org/buildroot/-/jobs/1687590514 Signed-off-by: Romain Naour <romain.naour@gmail.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr> (cherry picked from commitd2f92512f6) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>