EP80579 Datasheet, PDF (118/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
.
Table 3-5. Supported Operations by Memory Type
Operation
IA-32 core
AIOC Agents
Type
Size
Bytes
Coherent
(IA WB
Cacheable)
AIOC-Direct^a
Coherent
AIOC-Direct^a
1
S
S
–
–
2
S
S
–
–
4
S
S
S
M
8
S
S
S
S
Read, Write
16
S
M
M
M
32
–
–
M
M
64
S
–
M
M
128
–
–
M
M
1
S
M
–
–
Atom Read-
2
S
M
–
–
Modify-Write
(Semaphore)
4
S
M
S
S
8
S
M
–
–
a. AIOC-Direct is a feature of the Intel^® EP80579 Integrated Processor with Intel® QuickAssist Technology SKU.
3.3.3
Characteristics of Device Configuration
To be able to leverage existing IA BIOS, O/S, and power management software, the
EP80579’s configuration mechanisms follow existing IA platform approaches. Of the
four major components of the EP80579:
• The IA-32 core can use normal IA platform configuration algorithms.
• The IMCH and IICH can use normal IA platform configuration algorithms.
• To interoperate with normal IA platform configuration algorithms, the AIOC must be
configured by the IA processor.
With the EP80579, the boot and configuration process is:
4. The IA boots from a FLASH device on the IICH SPI (LPC) interface. System
software discovers and configures the devices on PCI bus 0 in the IMCH/IICH.
5. System software discovers and configures the devices behind the Transparent PCI-
to-PCI bridge into the AIOC. This may amount to allocating memory regions
specified by the BARs¹.
6. System software configures other buses on the system.
Once this process completes, the EP80579 is ready for operation.
It may be necessary for software to re-order the devices on bus 0 in the IMCH/IICH/
AIOC to ensure that the AIOC can obtain the resources it needs. Since enumeration
involves either a depth-first or a breadth-first traversal of the device tree from device
zero (depending on the implementation of the platform PCI enumeration and discovery
code), the system may not be able to honor a request for a large memory region from
an AIOC device if this device is enumerated late in the process due to a large device
number. This issue is not unique to the EP80579 and is handled in whatever fashion
standard IA platform software handles such resource issues.
1. A 32-bit BAR can request a single memory size that is a power of 2 from 16B to 2GB according to the PCI specification.
Intel^® EP80579 Integrated Processor Product Line Datasheet
118
August 2009
Order Number: 320066-003US