Hi Bas, Am 30.08.2010 um 11:44 schrieb Bas Wijnen:
> Hi, > > I'm mostly using the Ben NanoNote nowadays (which has a Jz4740), which > has a USB device port that can be used to unbrick it. I saw someone > talk about unbricking the mipsbook as well, thinking of JTAG. > > I don't want to discourage you, but I would advise to see if the Jz4730 > of the mipsbook can be unbricked in the same way. According to It can't. The difference is that the jz4740 has an internal boot ROM that handles all this. The jz4730 doesn't. I.e. it simply starts execution of code at address 0x0000000 (or similar). This is connected to NAND flash. If that part of NAND flash is broken, only JTAG remains. > Ingenic's Linux source, there is a usb device controller on-board, and > there is something called BOOT_SEL (which with the 4740 is used to > switch between nand boot and usb boot). > > I opened my mipsbook, and found a header which seems to be for a > mini-USB-B connector (so to make the mipsbook use the device port). If You mean the 4-pin connector near a reset button? This is a RS232 console interface (needs a adapter). > my mipsbook would be bricked, I'd solder a connector to that and see if > it can be made to work. Perhaps it's better to first do that with a > working machine, though, so you can test if the port can indeed be used. > > Just a suggestion. :-) > > Perhaps some people may want to use the port for "normal" things as > well, which should of course also be possible. You probably need some > (smd) components with it; I'm just guessing that it will work "good > enough for unbricking" without them (they're probably for improving the > link quality). I may well be wrong about that, of course. Unfortunately, if U-Boot is damaged there is *only* JTAG remaining. I hope that I receive my adapter PCB today so that I can solder the connectors and connect it to the Openmoko Debug Board. Then, we will see... Best regards, Nikolaus _______________________________________________ Mipsbook-devel mailing list Mipsbook-devel@linuxtogo.org http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/mipsbook-devel
