On Mon, Aug 15, 2011 at 5:38 PM, Bob Breuer <breu...@mc.net> wrote: > Mark Cave-Ayland wrote: >> On 11/08/11 17:11, Bob Breuer wrote: >> >>> The ledma base address defaults to 0xff000000 on reset. This >>> fixes a bug with Solaris and SS-20 OBP when boot net is skipped. >>> >>> Signed-off-by: Bob Breuer<breu...@mc.net> >>> --- >>> >>> diff --git a/hw/sparc32_dma.c b/hw/sparc32_dma.c >>> index e75694b..61812fb 100644 >>> --- a/hw/sparc32_dma.c >>> +++ b/hw/sparc32_dma.c >>> @@ -252,6 +252,9 @@ static void dma_reset(DeviceState *d) >>> >>> memset(s->dmaregs, 0, DMA_SIZE); >>> s->dmaregs[0] = DMA_VER; >>> + if (s->is_ledma) { >>> + s->dmaregs[3] = 0xff000000; >>> + } >>> } >>> >>> static const VMStateDescription vmstate_dma = { >> >> Oh that's interesting indeed. This corresponds to the fix I added to >> OpenBIOS here: >> http://lists.openbios.org/pipermail/openbios/2011-April/006350.html. >> >> I guess that we should just assume a fixed address of 0xff000000 based >> upon the evidence we have to date. >> > > 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. > > 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.
Ops. Apologises for sending you in the wrong direction. To my defence - are you sure the dbri stub is completely unnecessary? I vaguely remember that the initialization routine had no surrounding guard code. Completely missing dbri seemed to abort the further initialization at least for the devices in the same slot. Artyom > Bob > > [1] http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/DMA2.txt > [2] http://tyom.blogspot.com/2010/05/sx-framebuffer-emulation.html > > -- Regards, Artyom Tarasenko solaris/sparc under qemu blog: http://tyom.blogspot.com/