RE: [PATCH RESEND v4 0/3] Upgrade ACPI SPCR table to support SPCR table revision 4 format

[JeeHeng Sia]

> -----Original Message-----
> From: Sunil V L <sunilvl@ventanamicro.com>
> Sent: Friday, August 23, 2024 10:29 PM
> To: JeeHeng Sia <jeeheng.sia@starfivetech.com>
> Cc: qemu-arm@nongnu.org; qemu-devel@nongnu.org; qemu-riscv@nongnu.org; 
> mst@redhat.com; imammedo@redhat.com;
> anisinha@redhat.com; peter.maydell@linaro.org; shannon.zhaosl@gmail.com; 
> palmer@dabbelt.com; alistair.francis@wdc.com;
> bin.meng@windriver.com; liwei1518@gmail.com; dbarboza@ventanamicro.com; 
> zhiwei_liu@linux.alibaba.com
> Subject: Re: [PATCH RESEND v4 0/3] Upgrade ACPI SPCR table to support SPCR 
> table revision 4 format
> 
> Hi Jee Heng,
> On Fri, Aug 23, 2024 at 04:31:39AM -0700, Sia Jee Heng wrote:
> > Update the SPCR table to accommodate the SPCR Table revision 4 [1].
> > The SPCR table has been modified to adhere to the revision 4 format [2].
> >
> > Meanwhile, the virt SPCR golden reference file for RISC-V have been updated 
> > to
> > accommodate the SPCR Table revision 4.
> >
> > [1]: 
> > https://learn.microsoft.com/en-us/windows-hardware/drivers/serports/serial-port-console-redirection-table
> > [2]: https://github.com/acpica/acpica/pull/931
> >
> Just curious - whether this needs changes in linux side as well? Does
> current linux code work fine with version 4 of SPCR table on RISC-V?
The current Linux ACPI Table has not yet been updated to support SPCR v4.
However, Linux RISC-V will be able to use the information in the QEMU's
SPCR table to boot with behaviour similar to ARM. 
> 
> Thanks,
> Sunil