o Add support for the recent SiS96x chipsets that have a new revision.
That includes a new bit of code to access the EEPROM, since it is
shared with the ieee1394 controller on those chipsets.
Mostly taken from FreeBSD (rev. 1.62 and 1.64 of sys/pci/if_sip.c). I
tried to make the code look less ugly, but couldn't invent documentation.
Fix PR #23481. Thanks to Stephane ENGEL <sengel AT melshake DOT com> for
the report and the cheerful testing.
* Get CFG_M64ADDR, CFG_T64ADDR, and CFG_DATA64_EN from the EEPROM.
Note, we still disable CFG_M64ADDR and CFG_T64ADDR later (XXX need
PCI bus capability flags for these).
* Print a message if we're in a 64-bit slot and 64-bit data is
disabled in the EEPROM. Make sure CFG_DATA64_EN is disabled if
we're not in a 64-bit slot.
DP83820. The DP83820 definitions are wrapped in #ifdef DP83820, since
there are enough differences that a single binary object would not be
able to efficiently drive both the DP83815 and DP83820.
