Philippe Mathieu-Daudé <phi...@redhat.com> writes: > On 10/17/19 12:45 PM, Sergio Lopez wrote: >> >> Philippe Mathieu-Daudé <phi...@redhat.com> writes: >> >>> Hi Sergio, >>> >>> On 10/16/19 12:12 PM, Sergio Lopez wrote: >>>> +Supported devices >>>> +----------------- >>>> + >>>> +The microvm machine type supports the following devices: >>>> + >>>> +- ISA bus >>>> +- i8259 PIC (optional) >>>> +- i8254 PIT (optional) >>>> +- MC146818 RTC (optional) >>>> +- One ISA serial port (optional) >>>> +- LAPIC >>>> +- IOAPIC (with kernel-irqchip=split by default) >>>> +- kvmclock (if using KVM) >>>> +- fw_cfg >>>> +- Up to eight virtio-mmio devices (configured by the user) >>> >>> If we have VirtIO devices, why not use virtio-serial instead of the >>> one on the ISA bus? >> >> The serial port on the ISA bus is simpler, and thus is supported for >> both SeaBIOS debugging and Linux's earlyprintk. This makes it *very* >> convenient for debugging boot issues. > > "... but it's also compatible with SeaBIOS" > > OK. Maybe we can add a comment such "These devices are the minimum > required to run SeaBIOS" in the 'Supported devices' section.
Well, that's not exactly true. SeaBIOS works without a serial port, it's just you can't get it to send its debugging messages anywhere (which most people won't see anyway). Sergio. >> >> Also, as it's explained in the documentation, users that no longer need >> it can disable the device and just rely on virtio-console. >> >> Sergio. >>
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