On Tue, Nov 22, 2016 at 1:57 PM, Dennis Lee Bieber <[email protected]> wrote: > On Tue, 22 Nov 2016 11:01:04 -0600, Robert Nelson > <[email protected]> declaimed the > following: > > <SNIP> > >> >>usr0 - turn on - on boot starting >>usr1 - turn on - starting scan of mmc0 (microSD) >> >>/uEnv.txt (boot) *default use for comparability with old images.. >>usr2 - turn on - found /uEnv.txt >>usr3 - turn on - running u-boot cmd: uenvcmd >> > <snip> > So if I understand the description from Mr. Watts, his board is never > finding anything after looking at the non-installed SD card. > >>/boot/uEnv.txt *default set by "eMMC flasher" >>usr2 - turn on - found /boot/uEnv.txt >>usr3 - turn on - running u-boot cmd: uname_boot >> >>usr3 - turn off >>usr2 - turn off >>usr1 - turn off >>Starting Scan off mmc1 (eMMC) >> > Either mine boots too fast too tell, or it follows a different > sequence > <G>... This implies that after the scan of SD card it drops back to usr0 > on, usr1 off, and then should go usr2 on, usr3 on... But I don't see it > when booting without an SD card -- appeared to cycle to all 4 on, then jump > to off/on/off/on (0/1/2/3), before normal activity (heartbeat, eMMC, cpu > flickers) > > In either case, it would seem that the problem board is never finding > /a/ boot configuration file when booting from eMMC. Since the problem board > also seems to never be recognized by the Mac OS even when booting from SD > card, I have no further ideas... either a debug serial adapter, or USB > keyboard/mouse and HDMI cable to a TV, to try examining the eMMC contents > after booting from SD card.
A serial cable would help. ;) > >>/uEnv.txt (boot) *default use for comparability with old images.. >>usr2 - turn on - found /uEnv.txt >>usr3 - turn on - running u-boot cmd: uenvcmd >> >>/boot.scr (for debian) >>usr2 - turn on - found /boot.scr >>usr3 - turn on - running u-boot cmd: bootscript >> >>/boot/boot.scr (for debian) >>usr2 - turn on - found /boot/boot.scr >>usr3 - turn on - running u-boot cmd: bootscript >> >>/boot/uEnv.txt *default set by "eMMC flasher" >>usr2 - turn on - found /boot/uEnv.txt >>usr3 - turn on - running u-boot cmd: uname_boot >> >>aka... it doesn't actually tell you much, unless it get's stuck.. >> > > HEH... Especially when my eMMC (running Wheezy > debian@beaglebone:/$ uname -a > Linux beaglebone 3.8.13-bone80 #1 SMP Wed Jun 15 17:03:55 UTC 2016 armv7l > GNU/Linux ) doesn't seem to have /uEnv.txt, /boot.scr, or /boot/boot.scr, > just /boot/uEnv.txt -- SDcard image does have /uEnv.txt though... You've > actually got me wondering how mine even boots... the first three are optional: http://elinux.org/Beagleboard:U-boot_partitioning_layout_2.0 the first one /uEnv.txt allows us to support the really really old angstrom version of u-boot.. If you look very close at your /uEnv.txt so you'll see actually reading /boot/uEnv.txt .;) Regards, -- Robert Nelson https://rcn-ee.com/ -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYihqLvqyDzC1t3Ukr2Jb4U7_LrCyFrJPns%2Bv%3D7TeA6Kcw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
