Re: [Qemu-devel] Fwd: Using QCOW2 with nand flashes.

[sai pavan]

On Tue, Jul 7, 2015 at 2:11 PM, Peter Crosthwaite
<address@hidden> wrote:
> On Mon, Jul 6, 2015 at 11:54 PM, sai pavan <address@hidden> wrote:
>>
>> Hi,
>>
>> I am trying to implement fake disk images for emulating nand flashes.
>> I see the spares files are formed when the content is zeros. But for nand
>> flashes the content is all one's initially. It is difficult for me make a
>> sparse file with all ones.
>>
>> Do any one have suggestions for this problem.
>>
>> I am thinking of creating an nand flash file with all zeros and negating the
>> data at receiving end in qemu.
>
> Could this be a feature of qcow or some other file format rather than
> a NAND specific thing? It probably applies to other flash media.
Yeah, its for all flash devices. Could be useful to emulate a bigger
spi flash too.
Let me know if qemu has any similar implantation in blockdev.

Thanks,
Sai Pavan.
>
> Regards,
> Peter
>
>> So the input file will be null, but the
>> concept of all 1's be intact. But this will be confusing if some one likes
>> to compare the output bin files after a write. One should read the data
>> negating.
>>
>> Regards,
>> Sai Pavan
>>
>>
>>