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

[Chao Xu]

Hi Abraham,

I finally got it working by adding "#define
CONFIG_SYS_ENABLE_PADS_ALL" in u-boot/include/configs/omap4_common.h!
This is removed by default in v2013.10. Do you know why? Thank you!

On Sun, Nov 24, 2013 at 10:11 PM, Abraham V.
<abraham.varricatt at vvdntech.com> wrote:
> 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
>
>



-- 
Regards,
Chao Xu