[U-Boot] PCIe Configuration on MPC8544 processor

[António Silva]

Hi all,
I am trying to activate a PCIe link between two MPC8544 processor's on a
custom board.
One processor is configured as Root Complex (cfg_host_agt[0:2] = '111') and
the other processor as endpoint (cfg_host_agt[0:2] = '101').
Only PCIe1 is active in both processors (cfg_IO_ports[0:2] = '010')

In u-boot I set the following flags in both processors:

#define CONFIG_PCI            /* Enable PCI/PCIE */
#define CONFIG_PCIE1            /* PCIE controler 1 (slot 1) */ //MJ
#define CONFIG_FSL_PCI_INIT        /* Use common FSL init code */

In the first processor (configured as RC) I get the following output:

*   pci_init_board: devdisr=7000008, io_sel=2, host_agent=7

    PCIE1 connected to Slot2 as Root Complex (base address e000a000)
....PCIE link error.  Skipping scan.LTSSM=0x00
    PCIE1 on bus 00 - 00*

In the second processor (configured as EP) I get the following output:

*   pci_init_board: devdisr=7000008, io_sel=2, host_agent=5

**    PCIE1 connected to Slot2 as End Point (base address e000a000)
               Scanning PCI bus 00
PCI Scan: Found Bus 0, Device 1, Function 0
        00  01  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 2, Function 0
        00  02  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 3, Function 0
        00  03  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 4, Function 0
        00  04  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 5, Function 0
        00  05  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 6, Function 0
        00  06  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 7, Function 0
        00  07  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 8, Function 0
        00  08  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 9, Function 0
        00  09  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 10, Function 0
        00  0a  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 11, Function 0
        00  0b  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 12, Function 0
        00  0c  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 13, Function 0
        00  0d  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 14, Function 0
        00  0e  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 15, Function 0
        00  0f  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 16, Function 0
        00  10  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 17, Function 0
        00  11  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 18, Function 0
        00  12  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 19, Function 0
        00  13  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 20, Function 0
        00  14  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 21, Function 0
        00  15  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 22, Function 0
        00  16  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 23, Function 0
        00  17  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 24, Function 0
        00  18  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 25, Function 0
        00  19  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 26, Function 0
        00  1a  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 27, Function 0
        00  1b  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 28, Function 0
        00  1c  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 29, Function 0
        00  1d  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 30, Function 0
        00  1e  1957  0033  0b20  00
PCI Scan: Found Bus 0, Device 31, Function 0
        00  1f  1957  0033  0b20  00
    PCIE1 on bus 00 - 00*

Each processor is detecting it's own PCIe interface but it is not detecting
the other interface on the bus.