On Mon, 2003-07-07 at 12:06, Menaka Lashitha Bandara wrote: > On Mon, 2003-07-07 at 05:37, Benjamin Herrenschmidt wrote: > > > looks like multcount is the key. > > > > Does it work better if you use hdparm to switch multcount back > > to 0 ? > > On my onboard pmac controller, it either hangs, with "lost interrupt" > being repeated, or resets ide0. > > I thought that it might be because you've changed DMA_TIMEOUT to 100 > from 500. When I recompiled with 500 again, it didn't change anything. > The driver pmac.c simply cannot get a dma, and doesn't have multicount > enabled.
Hrm... And the version in 2.4.20 worked ? That's really weird, the basic mecanism didn't change nor the timing calculations... Can you edit the driver in both kernels and turn #undef IDE_PMAC_DEBUG into #define IDE_PMAC_DEBUG And tell me the messages displayed about the timing register setting ? Ben.
