On 03/05/2018 07:29 AM, Philippe Mathieu-Daudé wrote: > On 10/26/2017 03:46 AM, Alexey Kardashevskiy wrote: >> A "powernv" machine type defines an ISA bus but it does not add any >> DMA >> controller to it so it is possible to hit assert(fdctrl->dma) by >> adding "-machine powernv -device isa-fdc". > > The same happens with the Alpha machine. > > On 12/13/2017 03:19 AM, Hervé Poussineau wrote: >> Le 08/12/2017 à 22:29, John Snow a écrit : >> [...] >>> >>> It looks like Herve was working on decoupling floppies from i8257, but >>> perhaps didn't get all the way through -- I'm not actually clear on what >>> work remains to be done here, maybe he can chime in if he's still >>> interested in the project? >>> >> >> Indeed, I worked on decoupling floppies (and other ISA devices) from >> i8257, for three reasons: >> 1) having a working floppy on MIPS Magnum machine. fdc is PC-compatible, >> but DMA controller is not i8257-compatible. >> 2) reimplement another ISA bus with a somewhat i8257-compatible DMA >> 3) for fun, support multiple ISA buses on a same machine but on >> different PCI bridges. >> >> I failed on point 1), mostly due to lack of documentation. >> I succeeded on point 2), by having locally some patches for a ISAPNP >> bus, where IO/IRQ/DMA addresses of ISA devices can change dynamically, >> and devices can be discovered by operating system. >> About point 3, most of the patches are ready, but some details are still >> to be fixed. > > I'm having hard time refactoring all these PC chipsets, I'll make some > room to send my current work as RFC before soft freeze.
Sorry I misunderstood the problem; my series only modify the Super I/O devices, being affected by the same problem Alexey has with the ISA DMA :(
