On 11/13/2014 01:10 AM, Gerd Hoffmann wrote: > Hi, > >> My understanding from an IRC conversation yesterday was that at >> least some of these ACPI blobs contain data which has to be constructed >> at the point it is requested (ie is not fixed at the point when >> QEMU starts up), because OVMF will do: >> * startup >> * prod some parts of the hardware to configure it >> * request ACPI tables via fw_cfg >> and the ACPI tables have to reflect the statu of the hardware >> after OVMF's poking, not before. > > It is this: > > [root@fedora ~]# cat /proc/ioports > [ ... ] > 0600-063f : 0000:00:01.3 > 0600-0603 : ACPI PM1a_EVT_BLK > 0604-0605 : ACPI PM1a_CNT_BLK > 0608-060b : ACPI PM_TMR > 0700-070f : 0000:00:01.3 > 0700-0707 : piix4_smbus > [ ... ]
So this is problematic: the PM1a_EVT_BLK and PM1a_CNT_BLK should not exist if hardware reduced mode ACPI is being used; the values in the FADT should be zero so there should be no ioports (see section 5.2.9 of the ACPI spec). If this is from an ARM platform, it _should_ be in hardware reduced mode. QEMU will have to take that into account. -- ciao, al ----------------------------------- Al Stone Software Engineer Linaro Enterprise Group al.st...@linaro.org -----------------------------------
