Thanks for your reply. I still could not get any progress; I tired following the dd instruction you sent in the SDK page as well as two methods described in pcduino8 page. I also got some stuff from Merrii (as Jhon suggested). I published it in a newer post on this forum.
The mmc does work once the android finish loading, so it may not be an incompatibility issue between the sdcard and the mmc controller - but who knows. I'll update if I have any news (and would appreciate any ideas..) Thanks again. On Friday, September 5, 2014 6:52:56 PM UTC+3, Jon Smirl wrote: > > On Fri, Sep 5, 2014 at 11:33 AM, Chen-Yu Tsai <[email protected] > <javascript:>> wrote: > > Hi, > > > > On Fri, Sep 5, 2014 at 8:44 AM, Jhon Yi <[email protected] <javascript:>> > wrote: > >> If this doesn't work, the only solution is to ask Merrii, or at least > >> let them provide one bootable sdcard then dd out the content and > >> search for the position. > >> > >> 2014-09-05 4:55 GMT+08:00 RFat <[email protected] <javascript:>>: > >>> Hi Jhon, > >>> > >>> Thanks for your suggestion. I tried: > >>> dd if=boot0_sdcard_sun9iw1p1.bin of=/dev/mmcblk0 bs=1024 seek=X > >>> > >>> where X = 0, 4, 8, .. > > > > See http://linux-sunxi.org/SDK_build_howto > > > >>> and the board never showed any response - it is just booting from the > nand > >>> (I presume..). Was this what you were suggesting? > > > > For me, sometimes it responds, sometimes it doesn't. > > Maybe the mmc controller is picky about cards, or the I/O pins > > are undervolted. Without a user manual and schematics ATM, > > it is hard to tell. > > I have had this problem on another CPU. Notes from that board.... > > 100ohm series resistor on all of the MMC lines with 10K pull ups > > > > > When I did get a response and boot0 was loaded, boot0 then complained > > it couldn't initialize mmc0, and halted. > > > > > > ChenYu > > > >>> If anyone else have a suggestion - I'll be grateful > >>> > >>> > >>> > >>> On Thursday, September 4, 2014 3:01:34 AM UTC+2, Jhon Yi wrote: > >>>> > >>>> I suggest that you'd better ask Merrii to give you the parameters. > >>>> Otherwise you could first try to dd the boot0 to a clean sd card from > >>>> 8kB and see if there is any print out from the serial port (just set > >>> > >>> > >>>> > >>>> the serial port of you computer to 115200n8), if not work, move up > 4kB > >>>> every trial until you see the right output. Do the seem thing to > uboot > >>>> begin from the end of boot0, until you find something meaningful. > Plus > >>>> good luck. > >>>> > >>>> 2014-09-04 5:00 GMT+08:00 RFat <[email protected]>: > >>>> > Hi everyone, > >>>> > > >>>> > I just got the Optimus board (by Merrii). Seems like a nice > hotrod.. > >>>> > > >>>> > I am trying to get u-boot running from the sdcard and I saw the > >>>> > binaries: > >>>> > > >>>> > u-boot-sun9iw1p1.bin > >>>> > boot0_sdcard_sun9iw1p1.bin > >>>> > > >>>> > in the SDK that poped up recently (A80_SDK_20140728). > >>>> > > >>>> > I guess I should be DD-ing these files to the sdcard but I am not > sure > >>>> > how. > >>>> > There must be specific values for the seek option -- does anyone > have a > >>>> > clue > >>>> > (I am not sure whether I am asking a trivial or a hard question..) > >>>> > > >>>> > Moreover, this board does not have a FEL or U-boot buttons like > other > >>>> > boards > >>>> > - will it always look for something readable in the sdcard and then > >>>> > moves on > >>>> > the the nand? > >>>> > > >>>> > I guess everyone is very excited about the availability of these > A80 > >>>> > boards > >>>> > and this mysterious SDK - the sunxi community is about to have > crazy > >>>> > power > >>>> > from a crazily modest device (ah, the late 80's of Acron paid > off..) > >>>> > > >>>> > Thanks! > > > > -- > > You received this message because you are subscribed to the Google > Groups "linux-sunxi" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] <javascript:>. > > For more options, visit https://groups.google.com/d/optout. > > > > -- > Jon Smirl > [email protected] <javascript:> > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
