Em 25/3/2011 15:31, Isaac Marino Bavaresco escreveu:
> Em 25/3/2011 15:10, Olin Lathrop escreveu:
>> Isaac Marino Bavaresco wrote:
>>> I use word-writes to register in an array of words what blocks were
>>> already received.
>> Huh?
>>
>>> The blocks may be received in any order and there
>>> is a mechanism to tell the server what blocks are still needed.
>> But that only applies to the order the blocks are temporarily saved in y=
our
>> buffer space.  The bootloader doesn't run until all the blocks are buffe=
red,
>> so it can write the app image in sequential order.  None of this explain=
s
>> why word write are necessary, as apposed to page writes.
>
> How can the boot-loader tell if a block full of 0xff was present in the
> middle of the application?


 Oops, hit 'send' too early by accident.


If I don't register somewhere each block as it is received, the only way
to tell if a block was already received would be to scan it from begin
to end to find a value different to 0xff.
Besides being too time-consuming, if a block full of 0xff is received it
will always be detected as not received.


Best regards,

Isaac

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