i.MX51 & MMU

i.MX51 & MMU

[Eric Benard]

Hi,

has anyone recently tested barebox master on a babbage board with MMU enabled 
? Here (not on a babbage, with a TO2 i.MX515 with 1 bank of DDR2), enabling 
MMU crash the board (which works fine with barebox with MMU disabled and with 
Linux 2.6.38-rc6 so the hardware seems not to be the root of the problem).

Thanks,
Eric


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Re: i.MX51 & MMU

[Sascha Hauer]

Hi Eric,

On Wed, Feb 23, 2011 at 09:34:46PM +0100, Eric Benard wrote:
> Hi,
> 
> has anyone recently tested barebox master on a babbage board with
> MMU enabled ? Here (not on a babbage, with a TO2 i.MX515 with 1 bank
> of DDR2), enabling MMU crash the board (which works fine with
> barebox with MMU disabled and with Linux 2.6.38-rc6 so the hardware
> seems not to be the root of the problem).

The memory space of the i.MX51 is a bit tight. It may be that you shadow
registers with the dma coherent memory space. Can you please post your
mmu setup code sniplet?
The babbage works with mmu enabled.

Sascha


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Re: i.MX51 & MMU

[Eric Benard]

Hi Sascha,

On 24/02/2011 09:39, Sascha Hauer wrote:
> On Wed, Feb 23, 2011 at 09:34:46PM +0100, Eric Benard wrote:
>> Hi,
>>
>> has anyone recently tested barebox master on a babbage board with
>> MMU enabled ? Here (not on a babbage, with a TO2 i.MX515 with 1 bank
>> of DDR2), enabling MMU crash the board (which works fine with
>> barebox with MMU disabled and with Linux 2.6.38-rc6 so the hardware
>> seems not to be the root of the problem).
>
> The memory space of the i.MX51 is a bit tight. It may be that you shadow
> registers with the dma coherent memory space. Can you please post your
> mmu setup code sniplet?
> The babbage works with mmu enabled.
>
OK so the problem is on my side. For the moment the mmu part is the one of the 
babbage. But I must investigate as I only have one DDR2 bank on this board 
(for a 256MB total size) when the babbage has 2 (for a 512MB total size).

Thanks,
Eric

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Re: i.MX51 & MMU

[Eric Benard]

On 24/02/2011 09:39, Sascha Hauer wrote:
> On Wed, Feb 23, 2011 at 09:34:46PM +0100, Eric Benard wrote:
>> Hi,
>>
>> has anyone recently tested barebox master on a babbage board with
>> MMU enabled ? Here (not on a babbage, with a TO2 i.MX515 with 1 bank
>> of DDR2), enabling MMU crash the board (which works fine with
>> barebox with MMU disabled and with Linux 2.6.38-rc6 so the hardware
>> seems not to be the root of the problem).
>
> The memory space of the i.MX51 is a bit tight. It may be that you shadow
> registers with the dma coherent memory space. Can you please post your
> mmu setup code sniplet?
> The babbage works with mmu enabled.
>
btw: NAND support for i.MX51 works fine here (with a 8 bits width 2k pages 
size NAND).

Eric

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