powerpc/405GP, cuImage and PCI support

[Carlo Pisani]

hi
I wrote here (1) a couple of years ago, I am still working with kernel
4.11.0 and there is broken support for initializing the PCI.

arch/powerpc/book/cuimage-walnut.c requires "/plb" compatible with
"fsl,pq2-localbus", while the device-tree file (walnut.dts) defines
"/plb" compatible with "ibm,plb3"

I am not an expert, but "fsl,pq2-localbus" != "ibm,plb3"

Therefore the PCI initialization of the PPC405GP seems wrong and every
kernel >= 2.6.26 is not able to correctly address the PDC20265

(1) https://bugzilla.kernel.org/show_bug.cgi?id=195933

an interesting not is:
kernel 2.6.26 can be compiled with arch=ppc and arch=powerpc

with arch=ppc the promise PDC20265 chip is correctly managed
with arch=powerpc the PDC20265 is not correctly managed


any idea? help? suggestion?

thanks
Carlo


--------------------------------------------------------------------------------------
    bus_node = finddevice("/plb");
    if (!bus_node)
    {
        notify_error(module, id, "device /plb not found");
        return;
    }
    if (!dt_is_compatible(bus_node, "fsl,pq2-localbus"))
    {
        notify_warn(module, id, "device fsl,pq2-localbus");
        notify_error(module, id, "device /plb is not compatible");
--------------------------------------------------------------------------------------
plb
        {
                /*
                 * Processor Local Bus (PLB)
                 */
                compatible = "ibm,plb3";
--------------------------------------------------------------------------------------


ide0 at 0x1f0-0x1f7,0x3f6 on irq 31
ide1 at 0x170-0x177,0x376 on irq 31