linux-kernel - RE: [EXT] [BUG BISECT] Net boot fails on VF50 after "dmaengine: fsl-edma: support little endian for edma driver"

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Date:   Fri, 5 Jul 2019 02:04:20 +0000
From:   Peng Ma <peng.ma@....com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
CC:     Vinod Koul <vkoul@...nel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Leo Li <leoyang.li@....com>, Andy Tang <andy.tang@....com>
Subject: RE: [EXT] [BUG BISECT] Net boot fails on VF50 after "dmaengine:
 fsl-edma: support little endian for edma driver"

Hi Krzysztof,

Got it. Thanks for your help

Best Regards,
Peng
>-----Original Message-----
>From: Krzysztof Kozlowski <krzk@...nel.org>
>Sent: 2019年7月4日 20:57
>To: Peng Ma <peng.ma@....com>
>Cc: Vinod Koul <vkoul@...nel.org>; dmaengine@...r.kernel.org;
>linux-kernel@...r.kernel.org; Fabio Estevam <fabio.estevam@....com>; Leo
>Li <leoyang.li@....com>; Andy Tang <andy.tang@....com>
>Subject: Re: [EXT] [BUG BISECT] Net boot fails on VF50 after "dmaengine:
>fsl-edma: support little endian for edma driver"
>
>Caution: EXT Email
>
>On Thu, 4 Jul 2019 at 04:10, Peng Ma <peng.ma@....com> wrote:
>>
>> Hi Krzysztof,
>>
>> I am sorry, It is my mistake to forget about VF50 used EDMA IP with little
>endian.
>> The Register(CHCFG0 - CHCFG15) of our platform designed as follows:
>> *---------------------------------------------------------------------
>> ----------*
>> |     Offset   | Big endian Register| Little endian Register|
>> |---------------------|--------------------------|-----------------------------|
>> |     0x0     |     CHCFG0    |     CHCFG3      |
>> |---------------------|--------------------------|-----------------------------|
>> |     0x1     |     CHCFG1    |     CHCFG2      |
>> |---------------------|--------------------------|-----------------------------|
>> |     0x2     |     CHCFG2    |     CHCFG1      |
>> |---------------------|--------------------------|-----------------------------|
>> |     0x3     |     CHCFG3    |     CHCFG0      |
>> |---------------------|--------------------------|-----------------------------|
>> |     ...      |        ......     |         ......      |
>> |---------------------|--------------------------|-----------------------------|
>> |     0xC     |     CHCFG12   |     CHCFG15     |
>> |---------------------|--------------------------|-----------------------------|
>> |     0xD     |     CHCFG13   |     CHCFG14     |
>> |---------------------|--------------------------|-----------------------------|
>> |     0xE     |     CHCFG14   |     CHCFG13     |
>> |---------------------|--------------------------|-----------------------------|
>> |     0xF     |     CHCFG15   |     CHCFG12     |
>> *---------------------------------------------------------------------
>> ----------*
>>
>> So we need this patch, I make some changes,Please help me to test
>> attatchment on VF50 board, Thanks.
>
>With the patch VF50 boots fine.
>
>BTW, Colibri VF50 nicely boots from network almost out of the box so it is easy
>to add it to automated tests for simple boot tests. This way you do not have to
>manually test it on such platform...
>
>Best regards,
>Krzysztof