On Fri, Sep 12, 2014 at 5:14 AM, <[email protected]> wrote:
> Hello,
>
> I'm new here, so I'll introduce myself, I'm an embedded software developer
> working with ARM based boards (A10, iMx, AM335x) from the Netherlands.
>
> I've been working on a custom linux installation for the BBB (buildroot).
> There's only one nagging problem I can't seem to solve. For booting I use
> u-boot and an uSD card with three partitions. The first is FAT. This work
> fine. But then comes the problem: eMMC.
>
> It seems like the only way to let the BBB boot off the eMMC is to create a
> FAT partition (#1) that goes from cylinder 1 to 9 (255 heads, 63 sectors).
> The eMMC is big enough for sure, so that's no problem, but it bothers me
> that I can't seem to change the partition size, and I don't understand why.
That's an old requirement, it was a "x-loader" bug, that got fixed
years ago.. (x-loader (original MLO) couldn't find "u-boot.bin")
>
> On the partition is a vfat filesystem with the MLO, u-boot.img and uEnv.txt
> files.
>
> I've read the AM335x technical reference thoroughly, checked all the boot
> flowcharts against a hexdump of the mmcblk1 device, but I can't find the
> reason why the device won't boot when I change the partition size.
>
> Does anyone know about any requirements I've missed? Is the size a given
> constraint? I would like to use a very small FAT partition of 1MB or so..
fat16 needs 12MB or greater to work.
btw, instead of bothering with the fat partition, just use one big ext4:
sudo dd if=MLO of=/dev/sdX count=1 seek=1 conv=notrunc bs=128k
sudo dd if=u-boot.img of=/dev/sdX count=2 seek=1 conv=notrunc bs=384k
Then just remember, to create the first partition with a 1mb hole at the start.
sudo sfdisk --in-order --Linux --unit M ${DISK} <<-__EOF__
1,,0x83,*
__EOF__
Regards,
--
Robert Nelson
http://www.rcn-ee.com/
--
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