On Sun, Nov 26, 2017 at 06:28:01PM -0800, Adam Novak wrote: > I've installed a SI-PEX40064 SATA controller card > <http://www.sybausa.com/index.php?route=product/product&product_id=156> > in my system that I am trying to use with PCI passthrough via Xen, in > order to give a guest VM its own real SATA controller so as to not > have to deal with virtual disks. Moreover, I want to boot off of a > disk attached to the card. > > The card implements (or pretends to implement) AHCI, so SeaBIOS starts > up and can see the attached disk. But SeaBIOS gets a timeout > communicating with the disk: > > |eff9d000| WARNING - Timeout at ahci_port_setup:469! > |eff9d000| AHCI/2: device not ready (tf 0x58) > > The card has a PCI Option ROM, and I think the Option ROM needs to be > loaded for the card to work and/or be bootable. But SeaBIOS refuses to > load the Option ROM. (My real physical system with Asus EFI firmware > and CSM enabled does load the Option ROM for the card when it is > installed.) I dug into the code, and it looks like it's the same issue > as is mentioned here: > > https://mail.coreboot.org/pipermail/seabios/2017-June/011425.html > > Basically, a device is not checked for an option ROM (or an > fw_fcg/CBFS-based Option ROM file), and its option ROM is not loaded, > if pci->have_driver is set for the device. That field gets set for > anything that apparently implements AHCI, so the Option ROMs for AHCI > controllers are skipped, even if they are useful. Removing that check > causes the option ROM for my card to be loaded, and allows the > bootloader stored on the disk attached to the card to start up.
That check is there because it would not be correct for both an option rom and a native driver to simultaneously attempt to register the same drive. Basically, there can be only one driver for a PCI card - either a native SeaBIOS one or an Option ROM. What happens if you compile SeaBIOS with CONFIG_AHCI disabled? -Kevin _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios
