I have the same exact problem with a stock Beaglebone Black a5a board. The board used to work fine. I shut it down for a few months. I went to plug it in and no usr lights flashed. Only the power light flashed. I as you, went to see what was wrong and hooked up a USB to serial on the UART rx, tx, gd to see the output. As soon as I applied power to the board it booted with an SD card. When I take the SD card out it boots as well. However if I don't have anything hooked up to the UART rx, tx, gd no boot, just a power light comes on.
Does anyone know how to fix this permanently or what has caused this? On Thursday, January 9, 2014 11:14:01 PM UTC-8, nitesh singh wrote: > > Hi, > > I am using a customised Beaglebone Black, whose schematics is very close > to Original Beaglebone Black. You can say we cloned the Beaglebone black > hardware and assembled the board. > > Now I used Robert C Nelson's Debian wheezy emmc flasher image sd card to > boot it for first time , and wrote the emmc. Then I dumped binary data > copied from EEPROM of one of the original beaglebone black's eeprom to the > eeprom on this. > > So, now the issue that i am facing is that, this board will not boot up > again from emmc or another sd card that i use, other than the flasher sd > card. > Then accidently or by chance, i tried to look at its UART0 port from UART > port on the other beaglebone black and it booted up as usual. > > After that i observed that this customised beaglebone black is booting > only when the UART0 is accessed on another Beaglebone black or just simply > connected to its UART. > > What can be the problem here ? The emmc flashed on another original > beaglebone black is working fine, just this customised board will not boot > in the usual manner. > > I was reading through the minicom output at UART0 for this custom board, > it gave some read errors, and also said that mmcblk0boot0 and mmcblk0boot1 > does not valid partition table. > What are these partitions and is it possible to write or create any > partitions on them ? I have seen that they are there on other beaglebone > blacks and mmcblk0 changes to mmcblk1 if booted from sd card, I could not > understand its function. Is this creating any problem with the bootup ? I > suspect the eeprom data also might be causing this error. > > I have attached the minicom output file for the custom board's UART0 port > while it was booting. > > One more thing, it seems, connecting only DGND and UART0_RX to another > board is sufficient to make it boot. So it is reading some data over Uart0, > is it to do with eeprom ? > > Please help. > > Thanks and regards, > Nitesh > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" 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.
