(please CC me on replies)
Hi,
Newer Macs have BIOS support for Thunderbolt hotplug, so no
specialized kernel driver is needed. Unfortunately, there is a problem
with Linux ACPI support that aborts initialization of this support.
>From the debug output, I know it starts executing these lines in \_SB.PCI0._INI:
Debug = "OSYS="
Debug = OSYS /* \OSYS */
Debug = \_SB.PCI0.LPCB.RTC.ISWI
If (!OSDW ())
{
If ((OSYS >= 0x07DC))
{
Debug = "Save Ridge Config on Boot"
R118 = UP18 /* External reference */
R119 = UP19 /* External reference */
...
The problem is that \_SB.PCI0._INI is executed before the RTC handler
is installed in scan.c. The read of \_SB.PCI0.LPCB.RTC.ISWI fails and
_INI aborts. (It is also read below, so just hacking out the Debug
line won't solve it.)
I think the solution is to remove the acpi_cmos_rtc driver and instead
use that code to implement generic support for SystemCMOS in
acpi_ex_cmos_space_handler in exregion.c.
Does this sound like the correct approach? I don't see a compelling
need to bind to the PNP0B* devices. It should be fine to implement
generic support.
Second, I believe the way to do this is move most of the code from
acpi_cmos_rtc.c to osl.c, and introduce something like
acpi_os_read_cmos and acpi_os_write_cmos. Does this sound correct?
Thanks,
Adam
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