zhashfs: write first block last

[Mitch Bradley]

On 3/20/2011 6:58 AM, Chris Ball wrote:
> Hi,
>
> On Sun, Mar 20 2011, Daniel Drake wrote:>
>> 1. Is this approach a good idea?
>
> Sounds great to me.
>
>> 2. Are we bothered by a misleading WARNING message appearing at the
>> end of the flashing process for those running on old/current firmware?
>> (a firmware update would fix this in future)
>
> I expect it'll cause people to report it to us or OLPCA as an error, yeah.
> Am I right in thinking that a .zd is actually just a signed forth script?

Actually it's the zsp that is signed, as a proxy for the much larger zd. 
  So the patch needs to be in the zsp.

The desire for the patch to apply both in secure and non-secure modes 
greatly complicates the situation.

Maybe we should have a flag day.

> Could we patch the misleading behavior inside the generated .zd, and would
> that be a good idea?
>
> - Chris.