On 10/28/20 1:29 PM, Keith Monahan wrote: > On October 26, 2020 4:01:52 PM Helge Deller <deller@xxxxxx> wrote: >> On 9/22/20 2:28 AM, Keith Monahan wrote: >>> Here's the ioscan from the actual hardware >>> >>> no_hostname:/> ioscan >>> H/W Path Class Description >>> =============================================== >>> bc >>> 8 bc Pseudo Bus Converter >>> 8/0 ba PCI Bus Bridge >>> 8/0/15.0 instrument PCI(103c1650) >> >> That seems to be a specific HP PCI card. >> Maybe it's possible to pass-through it at some point in an emulation ? > > Not super concerned with emulating that hw there. That card is used to connect the PCI bus (in turn, connected to GSC via DINO) to the logic analyzer backplane. > >> >>> 8/16 ba Core I/O Adapter >>> 8/16/0 ext_bus Built-in Parallel Interface >>> 8/16/1 audio Built-in Audio >>> 8/16/4 tty Built-in RS-232C >>> 8/16/5 ext_bus Built-in SCSI >> >> ^ this one isn't implemented yet in qemu. >> As I said in another mail, we currently emulate a PCI SCSI card instead. >> Maybe emulating the original SCSI controller isn't hard, but I don't know >> and I'm not a SCSI expert. > > The NCR 53C710 SCSI that's present inside LASI was pretty common. One > of the uses includes the Commodore A4091, a SCSI controller sold for > the Amiga 4000. The A4091 is emulated on WinUAE, which is open > source. To make my story go full circle, looking at that source, > located below, is based on QEMU source!! > > https://github.com/tonioni/WinUAE/blob/master/qemuvga/lsi53c710.cpp > > which is based on > > qemu/hw/scsi/lsi53c895a.c Cool, so someone already modified the qemu lsi53c895a.c driver to work as a 53C710 controller. And it probably works, which is good. > I don't know the significance/complexity of the difference between > emulating a PCI card vs accessing things via LASI, which would sit on > the GSC bus. Wishful thinking is that once we get there, that we've > got existing (albeit different system emulation platform) working > code that emulates those chip functions. I think to get it glued up with the GSC bus isn't hard. The LASI SCSI documentation is here: https://parisc.wiki.kernel.org/images-parisc/7/79/Lasi_ers.pdf page 8 of 114 (page 20 in pdf) The SCSI controller ports are mapped at offset 0x100 of the SCSI part of LASI. So, if someone has enough time to add a NC53C710 code to qemu, it should be possible. I think I could do that, but as soon as something doesn't work I'm not sure I would be able to debug it - I'm simply missing the SCSI knowledge. Helge
