Re: [ES40-developers] Patch: Misc DMA & System Fixes

[Camiel V. <iam...@gm...>]

Hello Brian,

I've committed this as well. Thanks!

Camiel.

On Tue, Feb 26, 2008 at 3:36 PM, Brian Wheeler <bdw...@in...> wrote:
> fixes for the DMA device:
>  * output wrapped in DEBUG_DMA ifdefs.
>  * no-op implementation of the different registers
>
>  System fixes:
>  * ignore reads of 0x480 & 0x4c0 (TLBIV, TLBIA).  It looks like
>  linux (and others) do a read immediately after a write.  Probably to
>  keep the pchip's addresses in the TLB?
>
>  In Linux's arch/alpha/kernel/core_tsunami.c:
>
>  184         csr = &pchip->tlbia.csr;
>  185         if (((start ^ end) & 0xffff0000) == 0)
>  186                 csr = &pchip->tlbiv.csr;
>  187
>  188         /* For TBIA, it doesn't matter what value we write.  For TBI,
>  189            it's the shifted tag bits.  */
>  190         value = (start & 0xffff0000) >> 12;
>  191
>  192         *csr = value;
>  193         mb();
>  194         *csr;
>
>  Debugging fixes:
>  * Require a <RETURN> after a failure call to stop before termination.
>  This lets the xterm stay alive so I can see what the last message was :)
>
>  Brian
>
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