Re: [PULL 02/10] hw/hppa/machine: Disable default devices with --nodefaults option

[Helge Deller <deller@gmx.de>]

Hi Guenter,

On 2/2/24 05:22, Guenter Roeck wrote:
> On Sat, Jan 13, 2024 at 06:57:20AM +0100, deller@kernel.org wrote:
>> From: Helge Deller <deller@gmx.de>
>>
>> Recognize the qemu --nodefaults option, which will disable the
>> following default devices on hppa:
>> - lsi53c895a SCSI controller,
>> - artist graphics card,
>> - LASI 82596 NIC,
>> - tulip PCI NIC,
>> - second serial PCI card,
>> - USB OHCI controller.
>>
>> Adding this option is very useful to allow manual testing and
>> debugging of the other possible devices on the command line.
>>
>
> With this patch in the tree, I get some interesting crashes in Seabios
> if I provide a somewhat unusual command line option. For example,
> something like
>
>      -usb -device usb-ehci,id=ehci \
>      -device usb-uas,bus=ehci.0,id=uas \
>      -device scsi-hd,bus=uas.0,scsi-id=0,lun=0,drive=d0 \
>      -drive file= ...
>
> is accepted as command line option but results in
>
> SeaBIOS PA-RISC 32-bit Firmware Version 15 (QEMU 8.2.1)
> Duplex Console IO Dependent Code (IODC) revision 1
> ------------------------------------------------------------------------------
>    (c) Copyright 2017-2024 Helge Deller <deller@gmx.de> and SeaBIOS developers.
> ------------------------------------------------------------------------------
>    Processor   Speed            State           Coprocessor State  Cache Size
>    ---------  --------   ---------------------  -----------------  ----------
>        0      250 MHz    Active                 Functional            0 KB
>        1      250 MHz    Idle                   Functional            0 KB
>        2      250 MHz    Idle                   Functional            0 KB
>        3      250 MHz    Idle                   Functional            0 KB
>    Emulated machine:     HP C3700 (64-bit PA2.0) with 32-bit PDC
>    Available memory:     1024 MB
>    Good memory required: 16 MB
>    Primary boot path:    FWSCSI.0.0
>    Alternate boot path:  FWSCSI.0.0
>    Console path:         SERIAL_2.9600.8.none
>    Keyboard path:        SERIAL_2.9600.8.none
> *ERROR* in SeaBIOS-hppa-v15:
> prepare_boot_path:2898
> SeaBIOS wants SYSTEM HALT.
>
> This is without --nodefaults, and it used to work. Is that intentional ?

This should now be fixed in the upcoming SeaBIOS-hppa-v16 version ("devel" branch):
https://github.com/hdeller/seabios-hppa/tree/devel
Could you test?
If it doesn't work, please give me the full command line.

> If I do use the --nodefaults parameter, I was unable to figure out how
> to configure the serial console. What command line parameter(s) do I need to
> get it ?

You need to add:
-serial mon:stdio
This will create a serial port if it's not yet there.

Thanks for your testing!

Helge