[U-Boot] [PATCH] Add support for offset of a filesystem within a block-device

Hannes Petermaier
2014-03-12T20:14:31Z

On 2014-03-12 20:33, Tom Rini wrote:
> On Wed, Mar 12, 2014 at 08:17:47PM +0100, Hannes Petermaier wrote:
>
>> Good idea, i've also thougt about this way ....
>> but what happens in case of OS is going to re-partitioning the drive
>> (flash), delete all partitions (dummy-part also) an puts the first
>> (new) partition behind the part-table (vxWorks can handle up to four
>> partitions and we give end-user the possibility to create/delete
>> partitions) ? First partition becomes laying over U-Boot @ 384k (and
>> some other stuff which may be stored there).
>> To prevent this case we would have to modify "fdisk" of vxWorks,
>> which i would like to prevent because this is a common part of OS
>> and would affect all mass-storage.
>> With my solution, OS never can see/delete any other (dummy)
>> partitiion - it has always "a normal drive" accessible.
> Since this is really eMMC, mark SPL/U-Boot as protected? I'd swear such
> a thing is allowed, but I've just been looking at QSPI things recently
> not eMMC so I might have some mental mismatch.
>
Hi Tom,
You're right. SPL could be marked as protected.
But how to deal here with u-boot itself ? its address is within a
possible area of a partition.
Fdisk doesn't know about that :-(
We also cannot protect #0 where partition-table is stored, because user
should able to create/delete partitions.

So - maybe be a solution, but unfortunately not for me :-(
Today we give to our end-users up to 4 partitiions, exact that what
VxWorks can support - so i will be hard to have a 5th one ...

best regards,
Hannes