1.1 KiB
The MPC106, codenamed "Grackle", is a PCI bridge/memory controller. Its predecessor was the MPC105, codenamed "Eagle". It replaced an Apple-made host bridge codenamed "Bandit", part number 343S1125.
Unlike the CPU, which generally runs in big-endian mode, the Grackle runs in little-endian mode in compliance with the PCI standard. This usually means that to get the result in the correct endian, the PowerPC must load and store byte-reversed inputs and results.
By default, Grackle operates on Address Map B.
CONFIG_ADDR can be found at any address in the range 0xFEC00000–0xFEDFFFFF, while CONFIG_DAT can be found at any address in the range 0xFEE00000–0xFEEFFFFF. The device trees also establish 0xFEF00000 as the 8259 interrupt acknowledgement register.
PCI Config addresses work as follows:
bus << 16 | device << 11 | function << 8 | offset
Revisions
Revisions under 4.0 could allow up to 75 MHz, whereas 4.0 and newer can allow up to 83 MHz.
General Data
Vendor ID: 0x1057 (Motorola) Device ID: 0x0002 (MPC106)
Within the Mac's own device tree, this is usually device 0.
It also spans for 0x7F000000 bytes starting from 0x80000000.