[SeaBIOS] [PATCH 0/2] use full io address space on q35

Kevin O'Connor kevin at koconnor.net
Mon May 12 17:00:58 CEST 2014

On Mon, May 12, 2014 at 03:28:25PM +0200, Gerd Hoffmann wrote:
>   Hi,
> This patch adds a config option to move PORT_ACPI_PM_BASE,
> then use the full I/O address space on q35.
> Patches have been sent already a few months back, but IIRC we didn't
> came to a final conclusion.  Resending rebased + with minor help text
> update to re-kick discussion.

Were you looking for this series to be included into the upcoming

My concern with the series is patch 1 - I don't think we should be
adding a compile time config setting for what I believe should be
detected at runtime.

It would seem to me that the QEMU<->firmware interfaces would be
simpler if QEMU just passed the desired iobase to the firmware.  (I
understand the setting may be needed early in the bootstrap process,
but a fw_cfg file could be at a static address, which could then be
read during bootstrap with only a few instructions.)

However, if passing the iobase from QEMU to firmware isn't an option,
then I think SeaBIOS should at least detect at runtime if it is
running on a QEMU version that supports a dynamic iobase.

Am I missing something?


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