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 <caesarxuc...@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.varric...@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 <caesarxuc...@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@lists.denx.de > >> http://lists.denx.de/mailman/listinfo/u-boot > > > > > > > > -- > Regards, > Chao Xu >
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