[U-Boot] [PATCH v4 2/2] fastboot: handle flash write to GPT partitions

[Tom Rini]

On Fri, Jan 23, 2015 at 11:38:04AM -0600, Rob Herring wrote:
> On Fri, Dec 12, 2014 at 5:51 PM, Steve Rae <srae at broadcom.com> wrote:
> > Implement a feature to allow fastboot to write the downloaded image
> > to the space reserved for the Protective MBR and the Primary GUID
> > Partition Table.
> > Additionally, prepare and write the Backup GUID Partition Table.
> 
> I've been looking at how to do the same thing here. This is an area
> that suffers from each vendor doing whatever they want. Using vendor
> download/flash tools here is painful. They are all different because
> that is where the value add is. ;) What tool do you use on the host
> side to create the image? I have seen some vendor code to do it, or
> you could use parted plus a disk file and extract the partition table
> from it. I find either method a bit fragile and non-standard IMHO.
> 
> The 2 options I've come up with are 1) enable USB MS and use whatever
> host side tool you like or 2) use the existing "gpt write" command in
> u-boot and tie that into fastboot "oem format" command. The advantage
> and disadvantage of the latter is that it hides the partitioning
> details in u-boot from the user, but requires changing the u-boot env
> to change partition layout. The partitioning requirements are pretty
> SOC specific it seems.
> 
> I'm not saying we can't support both, but having some standardization
> here would be good.

Option two seems "good" from a not firewalling off the details point of
view which means that there'll be a subset that wants to go with one
anyhow.

-- 
Tom
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