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On hardware platforms which have an check here ACPI BIOS, the HAL brings about Acpi.sys for being loaded during procedure startup at the base with the unit tree. Acpi.sys functions because the interface concerning the working procedure as well as the ACPI BIOS. Acpi.sys is clear to one other drivers while in the device tree.

On the other hand, until eventually the market converges on DMA controller interface requirements, there's a really need to assist some non-standard units in the working technique.}