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 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
