Re: [Qemu-devel] sparc32_dma: correctly initialize ledma base address

[Bob Breuer]

Mark Cave-Ayland wrote:
> On 15/08/11 16:38, Bob Breuer wrote:
> 
>> Depends on the rom.  The SS-5 rom always sets it correctly, whereas the
>> SS-20 rom only sets it when you do "boot net".  Also, this is just the
>> top 8 bits of the address.  The DMA2 documentation[1] for E_BASE_ADDR
>> states that these upper address bits default to 0xff, even though it
>> seems to incorrectly define it as bits 7:0 in the register instead of
>> 31:24.
> 
> Nice one - looks like I missed this when reading the documentation. At
> least the choice of default address now makes sense.

It might also make sense to modify the dma address calculations to use
only the top 8 bits from ledma.  Not sure if anything will care about
that though.

>> If you follow Artyom's blog, at [2] it was assumed that the bogus dbri
>> device was the culprit (which is also why I went down the path of
>> implementing the dbri device), when in reality, the selftest failure
>> was preventing "boot net" from running and fixing the ledma register
>> settings.
> 
> Okay - I think I see ;)  In that case, I'd say this patch should be
> applied if Blue hasn't already done it (*sigh* I really miss the git web
> interface on qemu.org).

http://repo.or.cz/w/qemu.git  might be the next best thing, not sure if
there is a mirroring delay with it or not.

Bob