Now I synchronized my measurements with the serial console output. Loaded script from /boot/boot.scr gpio: pin 56 (gpio 56) value is 1 Running bootscript from mmc1:1 ... ## Executing script at 82000000 Output becomes high here gpio: pin 7 (gpio 7) value is 1 Checking for: /boot/uEnv.txt ... gpio: pin 55 (gpio 55) value is 1 1604 bytes read in 30 ms (51.8 KiB/s) Loaded environment from /boot/uEnv.txt Checking if uname_r is set in /boot/uEnv.txt... gpio: pin 56 (gpio 56) value is 1 Running uname_boot ... loading /boot/vmlinuz-4.1.3-ti-r7 ... 8211648 bytes read in 481 ms (16.3 MiB/s) loading /boot/dtbs/4.1.3-ti-r7/am335x-boneblack.dtb ... 57645 bytes read in 64 ms (878.9 KiB/s) loading /boot/initrd.img-4.1.3-ti-r7 ... 4570423 bytes read in 1222 ms (3.6 MiB/s) debug: [console=tty0 console=ttyO0,115200n8 bone_capemgr.enable_partno=BB-CAN1 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait fixrtc coherent_pool=1M] ... debug: [bootz 0x82000000 0x88080000:45bd37 0x88000000] ... Kernel image @ 0x82000000 [ 0x000000 - 0x7d4cc0 ] ## Flattened Device Tree blob at 88000000 Booting using the fdt blob at 0x88000000 Using Device Tree in place at 88000000, end 8801112c
Output becomes low 0.645s after the last serial message and 2.571s before the next Starting kernel ... [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacct [ 0.000000] Linux version 4.1.3-ti-r7 (root@b2-omap5-uevm-2gb) (gcc version 4.9.2 (Debian 4.9.2-10) ) #1 SMP PREEMPT Thu Jul 30 20:00:23 UTC 2015 [ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache [ 0.000000] Machine model: TI AM335x BeagleBone Black [ 0.000000] cma: Reserved 24 MiB at 0x9e000000 [ 0.000000] Memory policy: Data cache writeback Am Donnerstag, 6. August 2015 17:07:36 UTC+2 schrieb Axel Barkow: > > debian@beaglebone:~$ uname -a > Linux beaglebone 4.1.3-ti-r7 #1 SMP PREEMPT Thu Jul 30 20:00:23 UTC 2015 > armv7l GNU/Linux > > Am Donnerstag, 6. August 2015 17:05:48 UTC+2 schrieb RobertCNelson: >> >> >> >> On Thu, Aug 6, 2015 at 10:01 AM, Axel Barkow <[email protected]> wrote: >> >>> Here a picture to show, what I measured. KL 15 is the external start >>> signal, BBB 3.3V is the 3.3V line of the BBB and POWER HOLD is GPIO0.7. At >>> T1 the power is switched on and at T2 I think that the GPIO is set by the >>> device tree configuration. >>> >>> >>> Regards >>> >>> >>> Axel >>> >>> >>> >>> <https://lh3.googleusercontent.com/-ej2Mnld8X4s/VcN2R3Od_PI/AAAAAAAAACM/u-IKwgOgI6w/s1600/screenshot.png> >>> >>> >> That is odd.. the point of "gpio-hog" was to leave the specified gpio >> output in a specific state, even during gpio initialization. >> >> What kernel is this btw? >> >> 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]. For more options, visit https://groups.google.com/d/optout.
