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>
