On Saturday, January 18, 2014 8:06:23 AM UTC+1, Wulf Man wrote:
>
> you cannot use USB power while flashing the board. you MUST use a
> supply plugged into the barrel connector
>
Well - the last time I had flashed it before it worked with USB power from
an USB Power supply.
I have now done the flash now from a 5V 3.5A power supply connected to the
barrel connector - _exactly_ the same results.
Here the interresting portion of a pstree while flashing:
â”├â”─sh,1025 /opt/scripts/boot/am335x_evm.sh
â”│ â”└â”─bash,1161 /opt/scripts/tools/beaglebone-black-eMMC-flasher.sh
â”│ â”└â”─rsync,2501 -aAXv /bin /boot /dev /etc /home /lib /lost+found
...
â”│ â”└â”─rsync,2502 -aAXv /bin /boot /dev /etc /home /lib ...
â”│ â”└â”─rsync,2503 -aAXv /bin /boot /dev /etc /home /lib
...
and the df at the time showing the linux partition on the sMMC being
mounted:
root@beaglebone:~# df
Filesystem 1K-blocks Used Available Use% Mounted on
rootfs 1582864 1218260 282532 82% /
udev 10240 0 10240 0% /dev
tmpfs 101836 624 101212 1% /run
/dev/mmcblk0p2 1582864 1218260 282532 82% /
tmpfs 254584 0 254584 0% /dev/shm
tmpfs 254584 0 254584 0% /sys/fs/cgroup
tmpfs 5120 0 5120 0% /run/lock
tmpfs 102400 0 102400 0% /run/user
/dev/mmcblk0p1 98094 74086 24008 76% /boot/uboot
/dev/mmcblk1p2 1715936 516260 1110844 32% /tmp/rootfs
you see the new root-fs is mounted and is getting filled up...
and after the "flashing" of the eMMC the partitioning looks like this
(prior to rebooting):
root@beaglebone:~# fdisk -l /dev/mmcblk1
Disk /dev/mmcblk1: 1920 MB, 1920991232 bytes
4 heads, 16 sectors/track, 58624 cylinders, total 3751936 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk1p1 * 2048 198655 98304 e W95 FAT16 (LBA)
/dev/mmcblk1p2 198656 3751935 1776640 83 Linux
The same effect:
- shutting down system
- disconnecting power
- removing SD card
- powering up (from barrel connector)
- nothing happens on the serial line
- disconnecting power
- powering up (from barrel connector) pressing the "boot" button
- "C" shows up every second - to be expected as there is no SD card
installed to boot from
The power supply is NOT the reason either for flash not working - so what
is the problem?
Is there a means to check the pre-bootloader used to load and boot MLO to
see if it is corrupted?
Martin
--
For more options, visit http://beagleboard.org/discuss
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