[U-Boot] [PATCH v1] DOS_PBR block type is also valid dos block type.

[Tom Rini]

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On 03/15/2013 01:09 PM, Stephen Warren wrote:
> On 03/15/2013 12:36 AM, Sonic Zhang wrote: ...
>> We can erase the first 3 blocks completely before formatting it 
>> again. But, nothing can prevent others from formatting the SD 
>> card with different tools.
> 
> Surely any tool that creates a partition table on a device when 
> there wasn't any partition table there before (i.e. converts a raw
>  filesystem to a partition table) should zero out the "boot code" 
> area of that MBR, since there is no "boot code" area in a raw 
> filesystem. This seems like a bug in whatever partitioning tool was
> used.
> 
> If any device /always/ historically contained a real partition 
> table, or /always/ contained a raw FAT filesystem, then there will
>  be no issue. It's only when switching between the two, and not 
> clearing out all the data in the MBR when doing so, that you get 
> this problem.

To me the question is, are we looking at a "torture card" that doesn't
really contain a compliant set of choices, but happens to not fail in
other cases (that don't play clever games like we do) or a really
valid card and we need to make a harder choice.

- -- 
Tom
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