[Bug 235944] jedec_dimm(4) does not attach to KFA2 (aka Galax) Hall of Fame DDR4 sticks

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235944

--- Comment #12 from Conrad Meyer <cem at freebsd.org> ---
(In reply to Greg V from comment #11)
> (In reply to Conrad Meyer from comment #9)
> 
> This is first gen Zen (R7 1700, X370). I'm not sure what qualifies as
> interesting, but here's its description:

Nvm, I thought you might have zen2 for some reason.  I have the same device
with zen1 X390 and it seems to work fine here:

        intsmb0 pnpinfo vendor=0x1022 device=0x790b subvendor=0x1849
subdevice=0xffff class=0x0c0500 at slot=20 function=0 dbsf=pci0:0:20:0
handle=\_SB_.PCI0.D07C
            ACPI I/O ports:
                0xb00-0xb0f
          smbus0
            jedec_dimm0 at addr=0xa2
            jedec_dimm1 at addr=0xa6
            jedec_dimm2 at addr=0xaa
            jedec_dimm3 at addr=0xae

(Different subvendor/subdevice?  Not sure that matters.)  Same I/O port range. 
My SPD addresses are at different locations, but that is expected.


>         intsmb0 pnpinfo vendor=0x1022 device=0x790b subvendor=0x1462
> subdevice=0x7a33 class=0x0c0500 at slot=20 function=0 dbsf=pci0:0:20:0
> handle=\_SB_.PCI0.D028
>             ACPI I/O ports:
>                 0xb00-0xb0f
>           smbus0
>             jedec_dimm0 at addr=0xa4
>             jedec_dimm1 at addr=0xa6


> FreeBSD source calls 790b 'AMDCZ'.

Yeah, it is an old piece of IP, introduced in family 15h model ~70h ("Carrizo"
APU, I guess).  They reuse it in Zen.

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