It does have a serial port. Software name ttyO0, Hardware name: Serial Debug Header. See SRM (System Reference Manual) page 90. Purchase an FTDI TTL-232R-3V3 to talk to it.
I can't imagine working on or programming a BBB without one. If you live in the US, or can easily order from the US, get one from Mouser.com Mouser part number: 895-TTL-232R-3V3 <http://www.mouser.com/ProductDetail/FTDI/TTL-232R-3V3/?qs=sGAEpiMZZMvYU0Oh5y3R5sMdbLgwj41z> $20. --- Graham == On Thursday, February 12, 2015 at 2:28:59 PM UTC-6, [email protected] wrote: > > After I messed up uEnv.txt on eMMC I am trying to burn image in Micro SD > and boot BBB this way but no luck. > > These are the steps I did: > I downloaded bone-debian-7.5-2014-05-14-2gb.img.xz. > Extracted to bone-debian-7.5-2014-05-14-2gb.img > From Ubuntu Host machine executed: sudo dd > if=bone-debian-7.5-2014-05-14-2gb.img of=/dev/sdc bs=1M > After some time about 681 MB size image is written to Micro SD card. Now I > am assuming this image has everything you need. kernel, filesystem and > bootloader and I DO NOT have to manually make partitions (for kernel, fs > and swap) on the SD card. Please verify. > Then I plug in the Micro SD card to the BBB and attached my USB cord from > Host to target while pressing on S2 boot button. I also tried using 5V > power supply. > All 4 LEDS flashed after a minute only fourth LED flashes interval of a > second. LED next to 5V power supply is solid lit. > May be BBB booted with Linux but I have no way of knowing. I can not see > it through my COM port (before when booted with eMMC I could see the COM > port and connect to BBB with terra term). > I really wished BBB had serial port like most boards have. > Another question is I do not want Linux kernel loaded from either eMMC or > MicroSD card I want to setup NFS and tftpboot for that I want to prompt on > uboot. How can I do that? > Thanks > -- 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.
