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We can enable ACPI when AArch64 Linux is booted with QEMU and UEFI (AAVMF). When VM is booting and the SBSA driver has not initialized, writting data that exceds 32 bytes will cause the read FIFO full and proceeding data will be lost. The searil port appears to be stuck in this abnormal situation. A hack to reset read FIFO when UARTTIMSC=0 & UARTICR=0xffff appears to resolve the issue. The question is fully discussed at https://www.spinics.net/lists/linux-serial/msg23163.html Signed-off-by: Haibin Wang <wanghaibin.wang@huawei.com> Reviewed-by: Shannon Zhao <shannon.zhaosl@gmail.com> Reviewed-by: Ying Fang <fangying1@huawei.com> Signed-off-by: Yan Wang <wangyan122@huawei.com>