[SeaBIOS] [PATCH 0/4] acpi: fix up EJ0 in DSDT

Kevin O'Connor kevin at koconnor.net
Thu Sep 22 06:35:13 CEST 2011

On Wed, Sep 21, 2011 at 03:44:13PM +0300, Michael S. Tsirkin wrote:
> The reason is that our acpi tables declare both _RMV with value 0,
> and _EJ0 method for these slots. What happens in this case
> is undocumented by ACPI spec, so linux ignores _RMV,
> and windows seems to ignore _EJ0.

Could the DSDT just not define _EJ0 for device 1 & 2 instead of
dynamically patching them?  (Would there ever be a case where we
wouldn't know at compile time which devices need _EJ0?)

> The correct way to suppress hotplug is not to have _EJ0,
> so this is what this patch does: it probes PIIX and
> modifies DSDT to match.

The code to generate basic SSDT code isn't that difficult (see
build_ssdt and src/ssdt-proc.dsl).  Is there a compelling reason to
patch the DSDT versus just generating the necessary blocks in an SSDT?


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