[j-nsp] interface used on mini-PIM modules on Juniper SRX platform

[Martin T]

Hi,

on the other hand, for example SRX240 seems to use either Cavium
CN5220 or CN5230 SoC("OCTEON 52XX CPU" according to dmesg) which does
not seem to support PCI(http://www.cavium.com/OCTEON-Plus_CN52XX.html)
while according to mini-PIM compatibility matrix, SRX240 is able to
use same mini-PIMs as SRX210. However, I'm afraid that PCI interface
is just missing on CN52XX block diagram as according to SRX240 kernel
message buffer, it seems to have PCI controller:

pcib1: Initialized controller
pci0: <PCI bus> on pcib1
pcib2: <PCI-PCI bridge> irq 0 at device 0.0 on pci0
pci1: <PCI bus> on pcib2
pci1: <serial bus, USB> at device 2.0 (no driver attached)
pci1: <network> at device 7.0 (no driver attached)
pcib0: <Cavium on-chip PCIe HOST bridge> on obio0
pci2: <PCI bus> on pcib0
pci2: <processor> at device 0.0 (no driver attached)

Long story short, I would also think that mini-PIM's use PCI interface.


regards,
Martin

On 5/6/14, Edward Dore <edward.dore at freethought-internet.co.uk> wrote:
> The original PIMs on the J-series were PCI and the subsequent ePIM and uPIM
> were PCI-E.
>
> I believe the XPIM on the SRX series are also PCI-E.
>
> I’m not sure about the mini-PIM, but I would guess at PCI as the Cavium
> OCTEON processor used in the SRX210 is a CN5020 and the only real option it
> has for expansion is 32-bit 66MHz PCI. That would give you just over 2Gbps
> of bandwidth on the PCI bus shared between the single mini-PIM slot and
> anything else Junpier have hooked up to the PCI bus, with the biggest
> mini-PIM that you can get being 1x1Gbps.
>
> Edward Dore
> Freethought Internet
>
> On 5 May 2014, at 23:28, Martin T <m4rtntns at gmail.com> wrote:
>
>> Hi,
>>
>> has anyone investigated what interface is used in case of mini-PIM
>> modules? Physically it looks similar to 68-pin SCSI-3 connector:
>> http://i.imgur.com/UxhCS6g.jpg Do they use some proprietary protocol
>> or is it indeed SCSI? It would probably appear in kernel message
>> buffer(seen with dmesg/"show system boot-messages") when SRX is booted
>> up with mini-PIM inserted, but unfortunately I don't have any modules
>> around.
>>
>>
>>
>> regards,
>> Martin
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>
>