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The old code used a limited PCI configuration library, which was
duplicated into LEON2 and LEON3 BSP pci.c together with respective
Host controller PCI interface.
The LEON2 BSP had support for AT697 PCI, and LEON3 for GRPCI PCI
Host controller. With this update new PCI Host drivers are added,
and all support the new generic PCI Library:
* AT697 PCI (LEON2 only)
* GRPCI (LEON2-GRLIB and LEON3)
* GRPCI2 (LEON2-GRLIB and LEON3)
* Actel PCIF GRLIB Wrapper (LEON3 only)
The LEON2 BSP is defined as big-endian PCI in bsp.h, since the
AT697 supports only big-endian PCI.
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