Matthieu CASTET a écrit :
> Hi,
>
> Patra, Nilkesh a écrit :
>> On the latest version of MUSB, DMA is not working properly if the Data in
>> the packet doesn't start at 32bit aligned address. This issue was found
>> while using MUSB as g_ether. The basic ping does not work, if the data in
>> the Ethernet packet does not start at 32bit aligned address.
>>
>> To overcome this issue, we found one solution mentioned in the below patch.
>> This patch moves data (skb->data) by 2 bytes backwards in ethernet packet,
>> which is nothing but skb->head.
>>
>> I want to know, if there are any better approaches to fix this issue.
>>
> What dma_mask are you using ?
>
>>From what I understand, dma_map_single will use it to know if the dma
> buffer need to be aligned [1].
> So you need to set the last 2 bits to 0 and it should do everything for you.
>
Forget what I said it is only true in CONFIG_DMABOUNCE case...
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