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Re: [PATCH v3] fdc/i8257: implement verify transfer mode

From: John Snow
Subject: Re: [PATCH v3] fdc/i8257: implement verify transfer mode
Date: Wed, 18 Mar 2020 18:28:05 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 11/1/19 12:55 PM, Sven Schnelle wrote:
> While working on the Tulip driver i tried to write some Teledisk images to
> a floppy image which didn't work. Turned out that Teledisk checks the written
> data by issuing a READ command to the FDC but running the DMA controller
> in VERIFY mode. As we ignored the DMA request in that case, the DMA transfer
> never finished, and Teledisk reported an error.
> The i8257 spec says about verify transfers:
> 3) DMA verify, which does not actually involve the transfer of data. When an
> 8257 channel is in the DMA verify mode, it will respond the same as described
> for transfer operations, except that no memory or I/O read/write control 
> signals
> will be generated.
> Hervé proposed to remove all the dma_mode_ok stuff from fdc to have a more
> clear boundary between DMA and FDC, so this patch also does that.
> Suggested-by: Hervé Poussineau <address@hidden>
> Signed-off-by: Sven Schnelle <address@hidden>

I know it's many many moons later; I was out of the country for a month
when this patch arrived, and I lost track of it under my email backlog.

It looks reviewed and good to go, so I am staging it locally and testing it.


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