[U-Boot] [PATCH 1/2] FAT: check for partition 0 not 1 for whole-disk fs

[Tom Rini]

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On 10/05/12 16:36, Stephen Warren wrote:
> On 10/05/2012 05:27 PM, Tom Rini wrote:
>> On 10/05/12 16:17, Stephen Warren wrote:
>>> From: Stephen Warren <swarren at nvidia.com>
>> 
>>> The recent switch to use get_device_and_partition() from 
>>> do_fat_ls() broke the ability to access a FAT filesystem 
>>> directly on a whole device; FAT only works within a partition
>>> on a device.
>> 
>>> This change makes e.g. "fatls mmc 0:0" work; explicitly 
>>> requesting partition ID 0 is something that 
>>> get_device_and_partition() fully supports. However, 
>>> fat_register_device() expects partition ID 1 to be used in the 
>>> full-disk case; partition ID 1 was previously implicitly 
>>> specified when the user didn't actually specify a partition
>>> ID. Update fat_register_device() to expect the correct ID.
>> 
>>> This change does imply that if a user explicitly executes
>>> "fatls mmc 0:1" then this will fail, and may be a change in
>>> behaviour.
>> 
>> So wait, you can't list device 0, bus 1 after this patch?
> 
> That's partition 1 not bus 1.

Er yes, thinko there.

> In the context of having a raw FAT filesystem on a device with no 
> partition table, the partition specification "0:1" doesn't work
> before or after this patch; I believe (if it worked at all ever
> before) it was broken by the previous get_device_and_partition()
> rework.
> 
> If you do have a partition table, then "0:1" works just fine 
> with/without this patch.

OK, so the behavior change here, potentially involves 2 partitions
without a partition table?  What is the case where fatls mmc 0:1 would
fail now?

- -- 
Tom
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