Interesting note on "Unsupported SPROM revision"

[Michael Büsch]

> That resulted in:
> [       6.681088] ssb: PCI-ID not in fallback list
> [       6.681251] ssb: CHIPID not in nrcores fallback list
> [       6.681433] ssb: Core 0 found: UNKNOWN (cc 0x8FF, rev 0x7F, vendor
> 0xFFFF) [       6.689462] ssb: WARNING: Invalid SPROM CRC (corrupt SPROM)
> [       6.689467] ssb: Unsupported SPROM   revision 255 detected. Will
> extract v1 [       6.697123] ssb: Sonics Silicon Backplane found on PCI
> 
> Just wanted to put it on ML in case someone will ever hit that issue.
> 

all mmio reads return all-ones. That usually means your pci(e) does not work.
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