Mayuri, Your best bet with all of this is to contact Intel and get a privileged access account. If that is not possible or practical then you need to do some reverse engineering.
First of all, go get this document from Intel's web site: 514482_ByTti_SoC_SPIFlashProgGuide_Rev1p0.pdf I don't have a specific link to it but I know it is publically accessible. Search on the leading 6 digit number or "SPI Flash Programming Guide". This document fully describes the descriptor tables and how to use them. The FITC tool is the preferred way but you can bit-bang them with the info provided in that doc. As for the TXE you will need to get that from Intel - it is not publically available. But I can say if you are running on the E3800 family (Bay Trail) then you don't need it. The chip will boot without it but the XDP port will be locked out. You can also use the information from the programming guide to locate a TXE image in a 3rd party boot image and extract it out of that. I think that is what the idftool does. The coreboot image will need to be located at the very end of flash because that is where the hardware reset vector is. The nice thing about that is once you have set up the descriptors you don't have to rebuild/reprogram the entire flash image every time. For example, if your coreboot image is only 1MB in size then you only need to reprogram the last 1 megabyte of flash and leave the rest alone. Saves a ton of time. There has been a lot of talk about this issue on Intel's embedded communities forums. Check out this thread: https://embedded.communities.intel.com/thread/12354 Hope this helps! Brett From: coreboot [mailto:[email protected]] On Behalf Of Stefan Reinauer Sent: Wednesday, July 13, 2016 4:30 PM To: Mayuri Tendulkar Cc: Martin Roth; coreboot Subject: Re: [coreboot] TXE and Descriptor bin management in Coreboot ** Please note that the Sender of this email is from outside the Cobham NA IT Hub ** * Mayuri Tendulkar <[email protected]<mailto:[email protected]>> [160714 00:50]: > Ok, so do we need to ask Intel if we use Intel baytrail processor? How we can > create this descriptor.bin? Please have a look at util/ifdtool and util/ifdfake for our tools dealing with Intel Firmware Descriptors. The most comprehensive way of producing the information you need is by using Intel's fitc tool, however. If you are willing to put some development effort into this, we could use help, merging ifdtool and ifdfake, as well as incorporating more fitc like capabilities into the tool. Stefan -- coreboot mailing list: [email protected]<mailto:[email protected]> https://www.coreboot.org/mailman/listinfo/coreboot<https://www.coreboot.org/mailman/listinfo/coreboot>
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