[U-Boot] [PATCH 4/4] dfu: add SF backend

[Stephen Warren]

On 09/21/2015 11:13 AM, Fabio Estevam wrote:
> Hi Stephen,
>
> On Wed, Jun 11, 2014 at 7:03 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
>> From: Stephen Warren <swarren at nvidia.com>
>>
>> This allows SPI Flash to be programmed using DFU.
>>
>> Signed-off-by: Stephen Warren <swarren at nvidia.com>
>
> Is this still working in mainline U-boot?

I haven't tested SF support recently (only MMC). However, it should 
still work:-) Are you using ci_udc? If so, make sure you have this very 
recent patch:

> commit b337b3b2a53f112a217f4bd31307b02f830bb787
> Author: Stephen Warren <swarren at nvidia.com>
> Date:   Fri Sep 11 17:10:02 2015 -0600
>
>     usb: ci_udc: fix emissions of ZLPs
>
>     Commit 6a132416359e "ci_udc: Update the ci_udc driver to support bulk
>     transfers" caused the value of "len" to change without updating subsquent
>     users of that variable in ci_ep_submit_next_request(). This caused the
>     code that detects when to emit ZLPs (Zero Length Packets) never to
>     trigger, which in turn caused host timeouts when a ZLP was required,
>     which in turn broke tests/dfu/, even despite the assertion in that
>     commit's description that "These changes are tested for both the DFU and
>     lthor."
>
>     Fix this by modifying the added dtd iteration code not to modify "len",
>     but rather to keep state in a separate variable. Rename the variables
>     while we're at it so they describe their purpose better.
>
>     Fixes: 6a132416359e ("ci_udc: Update the ci_udc driver to support bulk transfers")
>     Cc: Siva Durga Prasad Paladugu <siva.durga.paladugu at xilinx.com>
>     Signed-off-by: Stephen Warren <swarren at nvidia.com>