On Tue, Sep 06, 2022 at 12:38:37PM +0530, Ajay Kaher wrote:
> During boot-time there are many PCI config reads, these could be performed
> either using Port IO instructions (PIO) or memory mapped I/O (MMIO).
>
> PIO are less efficient than MMIO, they require twice as many PCI accesses
> and PIO in
Ajay Kaher writes:
> During boot-time there are many PCI config reads, these could be performed
> either using Port IO instructions (PIO) or memory mapped I/O (MMIO).
>
> PIO are less efficient than MMIO, they require twice as many PCI accesses
> and PIO instructions are serializing. As a result,
During boot-time there are many PCI config reads, these could be performed
either using Port IO instructions (PIO) or memory mapped I/O (MMIO).
PIO are less efficient than MMIO, they require twice as many PCI accesses
and PIO instructions are serializing. As a result, MMIO should be preferred
when
