7. Device Tree Building
The device nodes are built according to a set of rules. This code is table-driven and dependent on each device's bus type. The second-stage bootstrap creates the node (mknod command), and then a series of properties are set on that node. The code is called as follows:
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PCI
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Follows well-defined IEEE 1275 bindings.
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ISA/EISA
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The 1275 draft specification is not followed as it still has some problems.
Kernel changes would also be needed (for instance, to combine the ISA and
EISA nexuses).
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ISA PnP
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Largely follows this binding.
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