One other data point. If I don't press and hold the boot switch when power is applied and instead wait a few seconds after applying power and then press the boot switch, the pserial command is able to detect the ASIC ID and download the x-loan.bin.
$ sudo ./pserial -p /dev/ttyUSB0 -f x-load.bin Waiting For Device ASIC ID: Press Ctrl+C to stop ASIC ID Detected: 0x85 0x74 0x61 0x90 Sending 2ndFile: Downloading file: 100.000% completed (10516/10516 bytes) File download completed. However, the BBB boots from the eMMC instead of the x-loan.bin I downloaded. So this is progress. It means that my pserial command does work with a BBB and the BBB ROM code does respond with its ASIC ID and does in fact download the x-load.bin. It looks like I just need to figure out what the correct boot switch power on sequence is now. On Sunday, July 20, 2014 10:36:45 AM UTC-5, Dallas Clement wrote: > > Hi William. Thanks for the help. I'm stuck much earlier on than u-boot. > I am expecting the ROM to return the ASIC ID when I run the pserial > command to try and load the first stage boot loader (x-load.bin). I'm not > even able to get past that. It looks like either I have the wrong pserial > command or maybe the BBB ROM does not provide an ASIC ID. I don't know > enough about the Sitara processor to say. If I can get the x-loader to > work, I think I am home free because it should be able to load a u-boot.bin. > > On Sunday, July 20, 2014 10:18:50 AM UTC-5, William Hermans wrote: >> >> Ok after reading the second link fully, I noticed a few things. >> >> First, the boot file is different. We have zImage typically, so I would >> assume the bootz command would be necessary. *OR* you could convert a >> zImage to uImage. >> >> Secondly, the base load address is different, so this would need to be >> taken into account. Although I think changing this would be fairly simple. >> >> Lastly, we also need to load the device tree board file, and I am a bit >> confused about this for loading serially. >> >> >> >> >> On Sun, Jul 20, 2014 at 7:59 AM, William Hermans <yyr...@gmail.com> >> wrote: >> >>> uboot is supposed to handle serial booting. However, I have no personal >>> hands on. Just a quick google search showed many results however. One thing >>> to note is that uboot for the BBB is patched, so possibly different. It >>> does not however make sense for this feature to be patched out, so I would >>> assume that it should work. >>> >>> Sorry for the less than definitive answer, perhaps someone with hands on >>> will respond. You can however experiment on your own. >>> >>> >>> http://blackfin.uclinux.org/doku.php?id=bootloaders:u-boot:serial_port_loading_files >>> http://blog.mezeske.com/?p=483 >>> >>> $ apt-cache search ckermit >>> ckermit - serial and network communications package >>> >>> Second link package mentioned is available, so looks to be possible. >>> >>> >>> On Sun, Jul 20, 2014 at 7:44 AM, Dallas Clement <dallas.a...@gmail.com> >>> wrote: >>> >>>> Hi, >>>> >>>> I am trying to boot my BBB over a serial connection, and need a little >>>> help. I have followed the instructions for UART recovery listed here >>>> http://elinux.org/BeagleBoardRecovery >>>> >>>> I built the pserial tool and an x-loan.bin, but when I try to load it, >>>> I just getting hanging. >>>> >>>> $ sudo ./pserial -p /dev/ttyUSB0 -f x-load.bin >>>> Waiting For Device ASIC ID: Press Ctrl+C to stop >>>> >>>> I am using a 6 pin TTL to USB cable to my PC. >>>> >>>> Perhaps the x-load.bin I am using is for the wrong processor >>>> (BeagleBoard)? If so, maybe I can convert the MLO produced by the BBB >>>> u-boot build to a x-load.bin. Just need a few pointers on how to do that. >>>> >>>> Thanks, >>>> >>>> Dallas >>>> >>>> >>>> -- >>>> 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 beagleboard...@googlegroups.com. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >> -- 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
