On Fri, Sep 5, 2014 at 11:33 AM, Chen-Yu Tsai <[email protected]> wrote: > Hi, > > On Fri, Sep 5, 2014 at 8:44 AM, Jhon Yi <[email protected]> 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]>: >>> 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]. > For more options, visit https://groups.google.com/d/optout. -- Jon Smirl [email protected] -- 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.
