Hi Martin, > How might the outcome of these debates affect the use of the > microSD "internal" storage on the XO-1.5?
I don't think there's much we can use Dave's advice for given the choice of microSD. If a microSD card that had a passthrough mode to access the raw flash existed, his argument would be that we should consider using that mode. > Wikipedia[1] is a bit hard-for-me-anyway to use to understand > whether linux drivers access the SD card's flash "directly"[2] > (which I assume is what dwmw means by "talk directly to the > underlying flash medium") or via some USB mass storage interface > layer provided by the card (is this part - perhaps the highest > level - of the FTL that dwmw and T'so are talking about?). Yep, it's like a mass storage interface -- that's why we can run our standard filesystems on SD cards -- and that interface is indeed part of the FTL. You can think of an SD card as being purely bare flash (of the type we use on the XO-1) plus the microcontroller that runs the FTL and abstracts the flash away from the OS. Oh, here's a cool image: http://en.wikipedia.org/wiki/File:Sd_insides.png - Chris. -- Chris Ball <[email protected]> One Laptop Per Child _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
