On Thu, Oct 31, 2013 at 1:34 PM, <vincent.cource...@gmail.com> wrote:
> Hi Jason,
>
> I really like the method you propose. Except the fact I tried it and I can't
> get it to work, or at least not following your directions.
>
> - I’ve flashed my BBB to Debian
> (http://elinux.org/BeagleBoardDebian) worked like a charm – now booting to
> the SD by default
>
> - I followed your instructions (8GB µSD, FAT32 formatted)
>
> o If I press no button, the BBB boots on the eMMC
This tells me that the bootloader you flashed onto the eMMC doesn't
properly work with the uEnv.txt put onto the uSD card as part of
following my instructions.
>
> o If I press the “boot” button while plugging the power, the BBB just
> doesn’t boot (stays in a “powered off” state, with only the LED near the
> power plug on)
This means that the uSD card FAT partition isn't marked as bootable.
You can do that with 'fdisk' from your BeagleBone running Debian in
all likelihood.
root@beaglebone:~# fdisk /dev/mmcblk1
Welcome to fdisk (util-linux 2.23.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): a
Partition number (1,2, default 2): 1
Command (m for help): p
Disk /dev/mmcblk1: 3904 MB, 3904897024 bytes, 7626752 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 label type: dos
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/mmcblk1p1 * 2048 133119 65536 e W95 FAT16 (LBA)
/dev/mmcblk1p2 133120 7626751 3746816 83 Linux
>
> The BBB is brand new, so maybe they changed something.
Who's "they"? It is possible CircuitCo switched the bootloader image
on the eMMC, but it sounds more like you did that above.
>
> Thanks for your help.
>
>
> On Thursday, September 26, 2013 10:16:54 AM UTC-7, Jason Kridner wrote:
>>
>> There are lots of ways to extract the contents of the eMMC to save off and
>> reuse. I'm proposing a method using Buildroot and an initramfs such that you
>> can simply drop a few files from a .zip onto a normal, FAT-formatted SD card
>> to perform the extraction. There are several things really handy here, such
>> as the ability to edit autorun.sh to be whatever script you want to run on
>> your board at boot. In the archive, I only have the necessary autorun.sh for
>> *saving* your eMMC content. The flip-side is provided here in the text such
>> that you need to go through a couple of steps before you trash your eMMC.
>>
>> The steps for saving off your eMMC contents to a file:
>> * Get a 4GB or larger uSD card that is FAT formatted.
>> * Download https://s3.amazonaws.com/beagle/beagleboneblack-save-emmc.zip
>> and extract the contents onto your uSD card.
>> * Eject uSD card from your computer, insert into powered-off BeagleBone
>> Black and apply power to your board.
>> * You'll notice USR0 (the LED closest to the S1 button in the corner) will
>> (after about 20 seconds) start to blink steadily, rather than the
>> double-pulse "heartbeat" pattern that is typical when your BeagleBone Black
>> is running the typical Linux kernel configuration.
>> * It'll run for a bit under 10 minutes and then USR0 will stay ON steady.
>> That's your cue to remove power, remove the uSD card and put it back into
>> your computer.
>> * You should see a file called BeagleBoneBlack-eMMC-image-XXXXX.img, where
>> XXXXX is a set of random numbers. Save off this file to use for restoring
>> your image later.
>>
>> Because the date won't be set on your board, you might want to adjust the
>> date on the file to remember when you made it. Delete the file if you want
>> to make room for a new backup image. For storage on your computer, these
>> images will typically compress very well, so use your favorite compression
>> tool.
>>
>> To restore the file, make sure there is a valid
>> BeagleBoneBlack-eMMC-image-XXXX.img file on the uSD card and edit autorun.sh
>> with your favorite text editor to contain the following:
>> #!/bin/sh
>> echo timer > /sys/class/leds/beaglebone\:green\:usr0/trigger
>> dd if=/mnt/BeagleBoneBlack-eMMC-image-XXXXX.img of=/dev/mmcblk1 bs=10M
>> sync
>> echo default-on > /sys/class/leds/beaglebone\:green\:usr0/trigger
>>
>> *NOTE*: Be certain to replace the 'XXXXX' above with the proper name of
>> your image file.
>>
>> This image was built using Buildroot. The sources are at
>> https://github.com/jadonk/buildroot with tag save-emmc-0.0.1. Download via
>> https://github.com/jadonk/buildroot/releases/tag/save-emmc-0.0.1 or clone
>> the git repo. It is a small fork from git://git.buildroot.net/buildroot tag
>> e9f6011617528646768e69203e85fe64364b7efd.
>>
>> To build, 'make beagleboneblack_defconfig; make; ./mkuimage.sh'. Output
>> files (am335x-boneblack.dtb, MLO, u-boot.img and uImage) will be in the
>> output/images subdirectory. The following files were created manually.
>>
>> uEnv.txt:
>> bootpart=0:1
>> bootdir=
>> fdtaddr=0x81FF0000
>> optargs=quiet capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
>> uenvcmd=load mmc 0 ${loadaddr} uImage;run loadfdt;setenv bootargs
>> console=${console} ${optargs};bootm ${loadaddr} - ${fdtaddr}
>>
>> autorun.sh:
>> #!/bin/sh
>> echo timer > /sys/class/leds/beaglebone\:green\:usr0/trigger
>> dd if=/dev/mmcblk1 of=/mnt/BeagleBoneBlack-eMMC-image-$RANDOM.img bs=10M
>> sync
>> echo default-on > /sys/class/leds/beaglebone\:green\:usr0/trigger
>>
>> The kernel is based on
>> https://github.com/beagleboard/kernel/commit/9fdb452245a58158a4bea787cdc663c17681bcfe,
>> but I applied the patches, added firmware and uploaded it to
>> https://github.com/beagleboard/linux/commit/ddd36e546e53d3c493075bbebd6188ee843208f9
>> to pull down in the Buildroot makefile. The link to the source for the
>> firmware is in the commit.
>>
>> I've applied to join the Buildroot mailing list to send these patches
>> upstream. The power management firmware is not yet loading properly, but
>> that is something I can look into.
>>
>> Happy hacking!
>
> --
> 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 beagleboard+unsubscr...@googlegroups.com.
> For more options, visit https://groups.google.com/groups/opt_out.
--
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 beagleboard+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
