[U-Boot] No single character output after update to latest u-boot on pandaboard

[Abraham V.]

Hello Chao,

That sounds odd. Can you try downloading the latest mainline uboot sources
and compiling those for your board?

ftp://ftp.denx.de/pub/u-boot/

At least, for the pandaboard I have, the 2013.10 release works well,
following your instructions. Only difference is that I'm using linaro's
cross-compiler.

Puzzled,
Abraham V.


On Fri, Nov 22, 2013 at 8:59 PM, Chao Xu <caesarxuchao at gmail.com> wrote:

> Hi Abraham,
>
> Thank you very much for your detailed reply! But I think I can rule
> out the three possible problems you mentioned.
> 1. The cross compiler should be fine. Because I use it all the time to
> compile kernel for pandaboard and it has never been a problem
> 2. I'm doing exactly what you suggested, i.e. the SD card is
> partitioned by a pre-built image.
> 3. The serial cable is fine because the pre-built image was working
> properly with the serial cable. Only after I update the u-boot comes
> the no-output problem.
> Could you think of any other possible problem? I suspect maybe I need
> to modify other files (uEnv.txt, boot.scr) in the /boot partition?
> These files came along with the pre-built image. Thanks again.
>
> On Fri, Nov 22, 2013 at 3:17 AM, Abraham V.
> <abraham.varricatt at vvdntech.com> wrote:
> > My company is designing a custom board that can be thought of as a
> > derivative of the pandaboard. I believe we have Rev B1 with us in the
> > office.
> >
> > Considering that you are not getting any debug messages on your serial
> > console, I suspect one of the following;
> > * your cross-compiler might have issues
> > * you haven't partitioned the SD card properly
> > * your serial cable might be damaged.
> >
> > Just short the TX and RX lines of your serial cable to test the last
> point.
> > If you can see echo messages, then good, at least the cable is working.
> >
> > Next worry about the partitions - to boot from SD card, the omap4 on the
> > pandaboard expects it in a certain format. Try using pre-build binaries.
> For
> > example;
> >
> > http://www.omappedia.com/wiki/Android_Panda_Pre_Built
> > http://omappedia.org/wiki/Ubuntu_Pre-built_Binaries_Guide
> >
> > They have instructions on how to format your SD card. Assuming they work,
> > then good! Last point is to check your cross-compiler. Just replace the
> > existing MLO and u-boot.bin (or u-boot.img; it depends on what version
> you
> > have) on the SD card with your compiled ones and you'll be in a good
> > position to narrow down bugs.
> >
> > All the best,
> > Abraham V.
> >
> >
> > On Fri, Nov 22, 2013 at 11:41 AM, Chao Xu <caesarxuchao at gmail.com>
> wrote:
> >>
> >> Hi,
> >>
> >> I'm trying to compile the latest u-boot for my Pandaboard Rev A2. The
> >> SD card was originally loaded with a working version of 12.04
> >> linaro-unbunt-developer image. Early printk is enabled in the original
> >> image.
> >>
> >> I followed this guide (http://elinux.org/Panda_How_to_MLO_%26_u-boot)
> >> and here is what I did:
> >> 1. export ARCH=arm
> >> 2. export CROSS_COMPILE=arm-linux-gnueabi-
> >> 3. make omap4_panda_config
> >> 4.make
> >> 5. cp MLO u-boot.img /SDCARD/boot/
> >>
> >> But when switching on my Panda, there is no output from the serial
> >> port. And the heartbeat LED is always off. (When every thing works, it
> >> is on when booting, and blinks after booting finished).
> >>
> >> I don't have any former experience with u-boot. So please let me know
> >> if there is any more info I should provide.
> >>
> >> Any help would be much appreciated! Thank you!
> >>
> >> --
> >> Regards,
> >> Chao Xu
> >> _______________________________________________
> >> U-Boot mailing list
> >> U-Boot at lists.denx.de
> >> http://lists.denx.de/mailman/listinfo/u-boot
> >
> >
>
>
>
> --
> Regards,
> Chao Xu
>