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Add support for users to specify a certain NIC via PCI bus:slot.func
notation, in case there are multiple NICs in one system.

Usage: flashrom -p nic3com=bb:ss.f

Corresponding to flashrom svn r510.
Signed-off-by: Christian Ruppert <spooky85@gmail.com>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>

- Read/write accesses through function pointers
- Command line parameter for internal/external flasher
- Board and chipset setup moved to internal init function
- Shutdown stuff moved to internal shutdown function

As a side benefit, this will allow us to undo chipset write enable
during shutdown.

Tested by Uwe on real hardware.

Corresponding to flashrom svn r476.
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>