Hi, On Fri, Aug 7, 2009 at 2:52 AM, Richard A. Smith<[email protected]> wrote: > Benjamin M. Schwartz wrote: > >> Martin Langhoff wrote: >>>> I would urge... >>> ...you are preaching to the ultra-converted, to the frustrated. I >>> wasn't personally involved, but I know at least Wad & Mitch looked >>> quite deep into this, and found no good offers. There is good evidence >>> to trust them in hardware and low level firmware matters :-) >> >> Indeed; I didn't mean to suggest otherwise. If they have written off the >> possibility of open disk controller firmware, I am sure they have made the >> right decision. > > We asked the UBFS devs if there were any devices they knew of that > allowed raw access to the nand or otherwise tweaking of the FTL. None > that they knew of. Neither Phison or SMI (The mfgs we were looking at) > have open firmware for their FTL chips. > > In the end we chose to use microSDHC cards. The B1/B2 build will have 3 > different mfg's of cards for qualification tests. Random power failures > are part of the qualification tests.
Cool for hardware upgrades and generally very bad for random write speeds and consequently booting/shutting down/updating the system/whatever. Has anyone run iometer with random read and write patterns on the controller/sdhc? Does the said controller do any kind of write caching to get around the limitations of SD cards? Or are there any microSDHC cards that I don't know of, with very good random writes? In which I would have to get hold of some. Best regards, Tiago Marques > > -- > Richard Smith <[email protected]> > One Laptop Per Child > _______________________________________________ > Devel mailing list > [email protected] > http://lists.laptop.org/listinfo/devel > _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
