Re: [RFC/WIP 0/3] WIP CTU CAN FD IP core mapping to the platform bus

[Peter Maydell]

On Mon, 9 Dec 2024 at 23:33, Pavel Pisa <pisa@fel.cvut.cz> wrote:
> our CTU CAN FD IP core is used on many FPGA platforms
> and has been even tapeout on some other university
> and even prototypes of the massive production chips
> (support for that organized by our former student
> in his company).
>
> But actual QEMU emulation targets only PCI/PCIe mapping in
>
>   hw/net/can/ctucan_pci.c
>
> of the core in
>
>   hw/net/can/ctucan_core.c
>
> I would like to add support to map the core at fixed position for
> SoCs and command line controlled location for FPGA targets.

Command line instantiation of devices at command line
controlled addresses and with command line connection
of IRQ lines is basically something we do not
currently support. There is some prototype/design work
going on about generic "create a machine from
the command line" handling, which would inevitably
involve allowing the user to specify addresses and IRQ
lines. But I don't really want to see ad-hoc device-specific
additions of small parts of similar functionality.

If there's a SoC that QEMU models that has this CAN
controller, then it's the SoC model (written in C)
that defines where it is mapped in memory and what
IRQ lines it is wired up to.

thanks
-- PMM