Hi Jeff (and posterity),
I am just going over my notes now and making sure it's all reproducible.
When you use BOOTP/DHCP to grab the bootloaders you have to set up a TFTP
server to supply u-boot.spl.bin and u-boot.img files (and a zImage but ...
tmi for now) - my point being you have to generate these two files
(u-boot.spl.bin and u-boot.img) from the u-boot source. And these are
different to the MLO and u-boot.img files you flash to your NAND . This
NAND part I definitely have working thanks to the recipe we both found
above (https://eewiki.net/display/linuxonarm/BeagleBone+Black).
Frustratingly, I had to use a different git repo to generate the BOOTP/DHCP
boot loader files (u-boot.spl.bin and u-boot.img respectively). To generate
these I instead use:
git clone git://git.ti.com/ti-u-boot/ti-u-boot.git
cd ti-u-boot
git checkout ti-u-boot-2017.01
CC=arm-linux-gnueabihf-
make CROSS_COMPILE=${CC} O=am335x_evm am335x_evm_defconfig
make CROSS_COMPILE=${CC} O=am335x_evm
And then the files you are after are am335x_evn/spl/u-boot-spl.bin and
am335x_evn/u-boot.img.
I hope that helps anyone in the same situation.
It would be interesting to hear from anyone with more insight...
end spam,
Dave.
On Wed, 9 Aug 2017 at 11:41 Jeff Andich <[email protected]> wrote:
> Good to hear..
>
> This may come in handy when we're at the point of writing the eMMC in our
> board..
>
> Regards,
>
> jeff
>
>
> On Tue, Aug 8, 2017 at 6:50 PM David Woolford <[email protected]>
> wrote:
>
>> Hi Jeff,
>>
>> Thanks for your reply. After I wrote that post I found the exact same
>> link (https://eewiki.net/display/linuxonarm/BeagleBone+Black) and the
>> "obligatory patches" are basically what I was missing for building the MLO
>> and u-boot.img files for the EMMC.
>>
>> Sorry if I wasn't clear - my task is to write the contents of the EMMC
>> from scratch using only an Ethernet connection. I'm doing that using
>> BOOTP/DHCP and TFTP. It's working now.
>>
>> Thanks,
>> Dave.
>>
>> On Wed, 9 Aug 2017 at 02:20 Jeff Andich <[email protected]> wrote:
>>
>>> I'm a newbie, so take this with a grain of salt or as comic relief for
>>> the experts on this website.
>>>
>>> I don't completely understand what you're trying to do, but it sounds
>>> like the kernel some how contains/flashes MLO/u-boot.img???
>>>
>>> But maybe you can generate SD Card which contains everything you need
>>> (e.g. MLO, u-boot.img, kernel, fs, uEnv.txt) and then uncomment the
>>> appropriate line within uEnv.txt to convert that into a flasher image, and
>>> subsequently flash the eMMC...
>>>
>>> Instructions for where to get EVERYTHING and transfer it to SD card for
>>> the BBB can be found here:
>>>
>>> https://eewiki.net/display/linuxonarm/BeagleBone+Black
>>>
>>> Once you download the u-boot source and apply all of the the obligatory
>>> patches for BBB, you will have a buildable u-boot/SPL tree.
>>>
>>> In lieu of generating a complete SD card image, it MAY BE possible to dd
>>> just the MLO/u-boot.img to the eMMC on the BBB, but I think you can only do
>>> this from a running FS on the BBB.
>>>
>>>
>>>
>>> On Tuesday, August 8, 2017 at 6:55:12 AM UTC-5, [email protected]
>>> wrote:
>>>>
>>>> Hi,
>>>>
>>>> I'm trying to automate the process of flashing a bootable emmc (NAND)
>>>> on my beagle bone black. I've pin strapped the board to boot using
>>>> bootp/dhcp - the kernel that gets loaded by the u-boot.img (that was pulled
>>>> in via dhcp+tftp) uses an initramfs as the basis of writing the MLO, (a
>>>> different) u-boot.img and root file system (containing zImage and uEnv.txt)
>>>> to emmc/NAND. This all works and when I restart the beagle bone black it
>>>> boots as I expect. Hooray for automated emmc flashing.
>>>>
>>>> However my problem is that I can't seem to hand roll a version the the
>>>> MLO and u-boot.img that I flash to NAND. What I'm using right now are
>>>> copies I found of these two files in the debian images distributed here:
>>>> https://beagleboard.org/latest-images (These images tend to contain
>>>> filesystems with /opt/backup/uboot/MLO and /opt/back/uboot/u-boot.img files
>>>> existing). If I use these two boot loader files, and craft my
>>>> /boot/uEnv.txt just so (uuid needs to be specified), then I can boot a
>>>> couple of kernels/filesystems I have lying around successfully.
>>>>
>>>> But I can't seem to reproduce these two files (MLO and u-boot.img) for
>>>> my NAND from source. I've tried these git repos:
>>>>
>>>> git://git.denx.de/u-boot.git
>>>> git://git.ti.com/ti-u-boot/ti-u-boot.git
>>>>
>>>> and even the u-boot source that that ships with the SDK:
>>>>
>>>> ~/ti-processor-sdk-linux-am335x-evm-04.00.00.04/board-support/u-boot-2017.01+gitAUTOINC+9fd60700db-g9fd60700db/
>>>>
>>>> For each of those I'm running
>>>>
>>>> make CROSS_COMPILE=arm-linux-gnueabihf- O=am335x_evm
>>>> am335x_evm_defconfig && make CROSS_COMPILE=arm-linux-gnueabihf-
>>>> O=am335x_evm
>>>>
>>>> And I've even tried a different config:
>>>>
>>>> make CROSS_COMPILE=arm-linux-gnueabihf- O=am335x_boneblack
>>>> am335x_boneblack_defconfig && make CROSS_COMPILE=arm-linux-gnueabihf-
>>>> O=am335x_boneblack
>>>>
>>>> This compilation process creates the MLO and u-boot.img files, but I
>>>> can never seem to successfully boot anything if I use them regardless of
>>>> which config I use.
>>>>
>>>> If it helps with clarity, I am trying out MLO and u-boot.img files by
>>>> booting from the SD card, copying over the new versions, and then running
>>>>
>>>> dd if=MLO of=/dev/mmcblk1 conv=notrunc bs=128k count=1 seek=1
>>>> dd if=u-boot.img of=/dev/mmcblk1 conv=notrunc bs=384k count=2 seek=1
>>>>
>>>> Note that I can always get back to the "bootable state" by writing the
>>>> backup boot loader files that come with debian distro instead: (the sd card
>>>> is running debian 8.7):
>>>>
>>>> dd if=/opt/backup/uboot/MLO of=/dev/mmcblk1 conv=notrunc bs=128k
>>>> count=1 seek=1
>>>> dd if=/opt/backup/uboot/u-boot.img of=/dev/mmcblk1 conv=notrunc bs=384k
>>>> count=2 seek=1
>>>>
>>>>
>>>> How can I build MLO and u-boot.img files in order to successfully boot
>>>> a kernel and file system of my choosing on the emmc/NAND? Is there a page
>>>> somewhere? Any help would be appreciated.
>>>>
>>>
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