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25 lines
1.1 KiB
Markdown
25 lines
1.1 KiB
Markdown
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.
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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.
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By default, Grackle operates on Address Map B.
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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.
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PCI Config addresses work as follows:
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bus << 16 | device << 11 | function << 8 | offset
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# Revisions
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Revisions under 4.0 could allow up to 75 MHz, whereas 4.0 and newer can allow up to 83 MHz.
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# General Data
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Vendor ID: 0x1057 (Motorola)
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Device ID: 0x0002 (MPC106)
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Within the Mac's own device tree, this is usually device 0.
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It also spans for 0x7F000000 bytes starting from 0x80000000.
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