pmz_status_handle() sets PMACZILOG_FLAG_BREAK from RR0, and pmz_receive_chars() clears it on the null character that ends the break without marking that character, then tests BRK_ABRT in RR1, where the SCC does not set it in asynchronous mode. Breaks therefore arrive as plain NULs: brk is never counted and BRKINT, PARMRK and SysRq never see them. Set BRK_ABRT in r1 for that character, as sunzilog does. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Assisted-by: LLM Signed-off-by: Tim Douglas <me@timdoug.com> Link: https://patch.msgid.link/20261013013541.4535-3-me@timdoug.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>