Thank you Peter for the details. Yes it is identifying it as opaque flash chip. We are able to completely read it but erase fails.
I have unloaded the intel spi driver and added a support in flashrom for intel denverton. I could see still it identify as opaque flash chip. I understood from the logs of flashrom that SMM protection is enabled. Working on it to disable it. Thanks Balaji On Fri, Oct 16, 2020 at 8:11 AM Peter Stuge <[email protected]> wrote: > Balaji Sivakumar wrote: > > Am working on adding a feature to upgrading the BIOS (complete > > IFD+ME+Coreboot) using intel-spi driver at the OS level. Able to > > successfully take the backup full 16MB spi nor flash data which > > includes IFD+ME+BIOS using flashrom Internal Programmer option and > > it is identified as Opaque flash chip and using dd command as well. > > I believe identified as "Opaque flash chip" means that no positive > identification was possible - this means that flashrom is not able to > perform all the SPI commands it needs using this programmer method > (internal) on this system. > > I added a warning message to the flashrom output many years ago when > a flash chip could not be positively identified, which said that > erase and quite possibly also write can never work unless the chip is > correctly identified. > > > > But we are seeing the erase fail through both flashrom and flash_erase > > utility. I believe it fails to erase at the flash descriptor location. > > > > As far as Read/Write access to the SPI regions, I have enabled the Host > CPU > > BIOS write access and ME Master Access as 0xFFFF through Intel FIT Tool > but > > still not able to erase it and it fails. > > > > Is there anything that could be preventing to enable read/write access to > > the Intel flash descriptor or any SOC SPI controller protection to access > > the Flash descriptor? > > I guess that since you work on a platform with ME hardware it is not > intended to allow what you want to do. > > As a first step you could try erasing the BIOS flash region, but I > don't think that can work until flashrom successfully identifies the > actual flash chip you are using. How to get there is unclear, but do > run flashrom with verbose output and see if the OPMENU contains the > SPI commands needed to identify, erase and write. I guess it might not. > > > //Peter > _______________________________________________ > coreboot mailing list -- [email protected] > To unsubscribe send an email to [email protected] > -- Thanks, Balaji +1-319-573-9768
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