AT91SAM9G45: MACB: not usable Ethernet when MMU is enabled

AT91SAM9G45: MACB: not usable Ethernet when MMU is enabled

[RONETIX - Asen Dimov]

Hello everyone,

the Ethernet on AT91SAM9G45(with ARM926J CPU) is not operational when 
the MMU is enabled.
Have some met with this issue before and probably solved it?

Regards,
Asen



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Re: AT91SAM9G45: MACB: not usable Ethernet when MMU is enabled

[Jean-Christophe PLAGNIOL-VILLARD]

On 15:12 Fri 02 Mar     , RONETIX - Asen Dimov wrote:
> Hello everyone,
> 
> the Ethernet on AT91SAM9G45(with ARM926J CPU) is not operational
> when the MMU is enabled.
> Have some met with this issue before and probably solved it?
check if the buffer is allocated for dma

Best Regards,
J.

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Re: AT91SAM9G45: MACB: not usable Ethernet when MMU is enabled

[Sascha Hauer]

On Fri, Mar 02, 2012 at 03:12:46PM +0200, RONETIX - Asen Dimov wrote:
> Hello everyone,
> 
> the Ethernet on AT91SAM9G45(with ARM926J CPU) is not operational
> when the MMU is enabled.
> Have some met with this issue before and probably solved it?

grep for dma_alloc_coherent, dma_flush_range. This should give you the
hints necessary to make it work.

Sascha

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Re: AT91SAM9G45: MACB: not usable Ethernet when MMU is enabled

[Jean-Christophe PLAGNIOL-VILLARD]

On 16:35 Fri 02 Mar     , Sascha Hauer wrote:
> On Fri, Mar 02, 2012 at 03:12:46PM +0200, RONETIX - Asen Dimov wrote:
> > Hello everyone,
> > 
> > the Ethernet on AT91SAM9G45(with ARM926J CPU) is not operational
> > when the MMU is enabled.
> > Have some met with this issue before and probably solved it?
> 
> grep for dma_alloc_coherent, dma_flush_range. This should give you the
> hints necessary to make it work.
I found back some patch to support it

the main issue is "bug" in the network stack of barebox
the send buffer is not allocated via dma_alloc_coherent so it's cdoes not work

on the macb you need the send and the receive buffer allocated via
dam_alloc_coherent

I'll send some patch

Best Regards,
J.

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