Specifications

 2012 Advanced Micro Devices, Inc.
ACPI/SMBUS Controller (bus-0, dev-20, fun-0)
AMD SP5100 Register Programming Requirements
Page 23
2.28 ACPI System Clock Setting
ASIC Rev Register Settings Function/Comment
All Revs SP5100 PMIO 0x53 [6] = 1 Enables the internally generated 14.318Mhz clock to the
ACPI logic.
SATA
USB
SMBUS
PATA
AC97
HD AUDIO
LPC
PCI
For register details refer to
the sections check-marked
in the SP5100 Register
Reference Guide
RTC
ACPI
PM REG
A-LINK
I/O REG
XIOAPIC
x
2.29 Integrated Pull-up and Pull-down Settings
ASIC Rev Register Settings Function/Comment
All Revs SP5100 PMIO2_F3, PMIO2_F4, PMIO2_F5,
PMIO2_F6, PMIO2_F7, PMIO2_F8
The BIOS needs to set pull-up/down settings for
GEVENT/GPM platform specifically. These pins have
integrated pull-up/down enabled by default and they are
powered by the S5 power. If they are to be connected to a
device that will be powered down during sleep state, the
BIOS should disable the pull-up/down and use external
pull-up/down to avoid leakage.
SATA
USB
SMBUS
PATA
AC97
HD AUDIO
LPC
PCI
For register details refer to
the sections check-marked
in the SP5100 Register
Reference Guide
RTC ACPI
PM2
REG
A-LINK I/O REG XIOAPIC
x
2.30 Revision ID
ASIC Rev Register Settings Function/Comment
SP5100 A12 Smbus_PCI_config 0x08
PMIO_53[6]
Smbus_PCI_config 0x40 [0]
Notes: A12 revision ID – 0x3A. Smbus PCI
config space 0x08 will show 3Ah after BIOS
is initialized.
In order to determine and set the correct revision ID for
SP5100, BIOS needs to perform the following sequence:
(1) During early post, read Smbus_PCI_config 0x08 and
PMIO_53[6] to determine if the ASIC is A11 or A12.
The ASIC is A11 if the return values are 39h and 0b
respectively. If Smbus_PCI_config 0x08 returns 3Ah, or
Smbus_PCI_config 0x08 is 39h and PMIO_53[6] is 1b,
then the ASIC is A12.
(2) If Smbus_PCI_config 0x08 is 39h and PMIO_53[6] is
1b, BIOS should write to Smbus_PCI_config, 0x40[0] = 1,
follow by writing to Smbus_PCI_config, 0x08 with a value
of 3Ah. Afterward, BIOS should clear Smbus_PCI_config,
0x40[0] back to 0.
SP5100 A14 Smbus_PCI_Config 0x08 This register will show 0x3C as revision ID for SP5100 A14.
SP5100 A15 Smbus_PCI_Config 0x08 This register will show 0x3D as revision ID for SP5100 A15.
SATA
USB
SMBUS
PATA
AC97
HD AUDIO
LPC
PCI
For register details refer to
the sections check-marked
in the SP5100 Register
Reference Guide
x
RTC
ACPI
PM_REG
A-LINK
I/O REG
XIOAPIC
x