From: Steve <[email protected]> Reply-To: "[email protected]" <[email protected]> Date: Tuesday, July 22, 2014 at 2:20 PM To: "[email protected]" <[email protected]> Subject: Re: [beagleboard] Want to serial boot my BBB
> For UART or USB you do not use the MLO file. When you build u-boot you should > have a spl/u-boot-spl.bin file. This is what you send over x-modem. The MLO > file is only used for Memory Booting (SD/Card, eMMC) while the u-boot-spl.bin > file is used for Peripheral Booting (UART, USB). I¹m not sure if this is correct. My understanding is that u-boot cannot be loaded directly because it is too big to fit into the SRAM, so MLO is loaded into SRAM which then sets up the DDR memory and timing and then u-boot is loaded into DDR memory. Why should this be any different when using UART or USB? Do you have any docs that explains the difference? Regards, John > > Steve K. > > On Tuesday, July 22, 2014 7:55:51 AM UTC-5, Dallas Clement wrote: >> I was able to send the MLO file via minicom / x-modem just fine to the board. >> However after the transfer completed, nothing happened. Should I expect to >> see any output on the serial console afterward? >> >> >> On Mon, Jul 21, 2014 at 10:14 AM, Dallas Clement <[email protected] >> <javascript:> > wrote: >>> Okay, thanks very much! I'll give that a try. >>> >>> >>> On Mon, Jul 21, 2014 at 3:23 AM, liyaoshi <[email protected] <javascript:> > >>> wrote: >>>> Sorry , I have made a mistake . >>>> >>>> On omap3 board ,you should use pserial to download from serial >>>> And on am335x / dm8148 board. x-modem is enough.and MLO is for boot from >>>> serial >>>> >>>> So , please try to use teraterm , and upload from >>>> file->transfer->xmodem->send. >>>> Then power on the beaglebone board . >>>> >>>> >>>> 2014-07-21 16:17 GMT+08:00 liyaoshi <[email protected] <javascript:> >: >>>> >>>>> If I remember correctly , You should load x-loader.bin NOT MLO >>>>> While the different between MLO and x-loader.bin is MLO has 8 bytes head , >>>>> the first 4 bytes is dest and the second 4 bytes is length . >>>>> This is for boot from NAND /eMMC , and when download from serial . the >>>>> boot rom will download to fixed address and limit length . >>>>> >>>>> >>>>> >>>>> 2014-07-21 12:04 GMT+08:00 John Syn <[email protected] <javascript:> >: >>>>> >>>>>> >>>>>> From: Dallas Clement <[email protected] <javascript:> > >>>>>> Reply-To: "[email protected] <javascript:> " >>>>>> <[email protected] <javascript:> > >>>>>> Date: Sunday, July 20, 2014 at 9:19 AM >>>>>> To: "[email protected] <javascript:> " >>>>>> <[email protected] <javascript:> > >>>>>> Subject: Re: [beagleboard] Want to serial boot my BBB >>>>>> >>>>>>> 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. >>>>>> You should be loading MLO, not x-load.bin. I also haven¹t tried this >>>>>> myself, but loading via serial shouldn¹t be any different from loading >>>>>> from tftp. The load addresses should be identical. >>>>>> >>>>>> Regards, >>>>>> John >>>>>>> >>>>>>> $ 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 <[email protected]> >>>>>>> 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_l >>>>>>> oading_files >>>>>>> <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 <[email protected]> >>>>>>> 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 >>>>>>> <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 [email protected]. >>>>>>> For more options, visit https://groups.google.com/d/optout >>>>>>> <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 [email protected] <javascript:> . >>>>>>> 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 [email protected] <javascript:> . >>>>>> 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 a topic in the >>>> Google Groups "BeagleBoard" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/beagleboard/bsIWXc2pJJY/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> [email protected] <javascript:> . >>>> 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 [email protected]. > 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. 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