If I understand correctly, the current schematics have both hard-wired flash for the ARM CPU and also space for an SD card, with the ARM set up to boot (only) from the hard-wired flash.
a) Is this correct? b) If so, why do we have the SD card, and is its intended purpose serious enough to merit including yet another driver? Keep in mind that removing the SD card presumably involves breaking the tamper envelope, thus wiping the key store. c) Why are we using hard-wired flash at all, instead of, eg, just booting from an SD card? Fear of SD card complexity (if so, see (b)...)? d) If I understand correctly (questionable), SD cards take care of wear leveling. I'm guessing that the hardwired flash envisioned for the Alpha board does not, ie, that our driver for the hard-wired flash may need to deal with wear-leveling itself. I don't really know how many write cycles we expect the hard-wired flash to have, so I'm not sure how serious an issue this is. Apologies if some of this is a bit vague, software guy trying to understand reasoning behind hardware choices. _______________________________________________ Tech mailing list Tech@cryptech.is https://lists.cryptech.is/listinfo/tech
