Talk:OpenPOWER Firmware

From RCS Wiki
Revision as of 16:13, 20 July 2021 by HLandau (talk | contribs)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

Locations of SEEPROM and BMC SPI Flash

I can find this reference on IBM's site,

The SBE has several stages, with the first part stored in processor one-time programmable read-only memory (OTPROM) and another part stored in the SEEPROM module located on the POWER processor module.

which suggests that SEEPROM is actually a tiny chip outside the POWER9?/POWER8? die, but I am not positive.

Also, this wiki page mentions "BMC SPI Flash", but I am unsure if this is a separate physical flash chip from PNOR?

AbstractConcept (talk) 11:23, 30 June 2021 (CDT)

It is practically guaranteed that the CPU SEEPROM is a separate die to the main POWER9 die, probably attached via I2C. Consider this photo of a POWER8 module without the heatspreader, probably some of those additional chips are SEEPROMs.

The BMC SPI flash is separate to the POWER firmware SPI flash; they are both in separate sockets on the mainboard. --HLandau (talk) 16:13, 20 July 2021 (CDT)