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Date: Tue, 02 Nov 2004 09:12:24 -0800
From: Manish Lachwani <mlachwani@mvista.com>
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To: Thomas Petazzoni <thomas.petazzoni@enix.org>
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Subject: Re: Custom kernel crashes
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Hello !

What are these values: NPP_BOARD_INTERNAL_SRAM_BASE, 
NPP_BOARD_INTERNAL_SRAM_END and NPP_BOARD_INTERNAL_SRAM_BASE.

Also, what is ENTRYLO() defined as?

Thanks
Manish Lachwani



Thomas Petazzoni wrote:
> Hello,
> 
> Manish Lachwani a écrit :
> 
>> This may or may not apply to your case. Is this board still the one 
>> that has the Marvell Discovery ethernet device? If yes, Marvell 
>> Discovery has its SRAM located at 0xfe000000. So, make a check in the 
>> ethernet driver or other board specific sources and see if there is 
>> any access to this SRAM location.
> 
> 
> The DMA buffers and DMA buffer descriptors used for the serial driver 
> are all located in the SRAM of the Marvell, which is mapped using a 
> wired uncached TLB entry.
> 
> Here's the code that wires the entry :
> 
>   add_wired_entry(ENTRYLO(NPP_BOARD_INTERNAL_SRAM_BASE),
>                   ENTRYLO(NPP_BOARD_INTERNAL_SRAM_END),
>                   NPP_BOARD_INTERNAL_SRAM_BASE,
>                   PM_256K);
> 
> I would like to use ioremap() instead of wired TLB entries, but for the 
> moment, I'm focusing on this crash.
> 
> Thanks,
> 
> Thomas