Re: [Qemu-ppc] [Qemu-devel] [PATCH] cuda.c: return error for unknown commands

[Mark Cave-Ayland]

On 22/01/16 23:07, Alyssa Milburn wrote:

> This avoids MacsBug hanging at startup in the absence of ADB mouse
> input, by replying with an error (which is also what MOL does) when
> it sends an unknown command (0x1c).
> 
> Signed-off-by: Alyssa Milburn <address@hidden>
> ---
>  hw/misc/macio/cuda.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/hw/misc/macio/cuda.c b/hw/misc/macio/cuda.c
> index 9db4c64..7e57de5 100644
> --- a/hw/misc/macio/cuda.c
> +++ b/hw/misc/macio/cuda.c
> @@ -605,6 +605,11 @@ static void cuda_receive_packet(CUDAState *s,
>          }
>          break;
>      default:
> +        obuf[0] = ERROR_PACKET;
> +        obuf[1] = 0x2;
> +        obuf[2] = CUDA_PACKET;
> +        obuf[3] = data[0];
> +        cuda_send_packet_to_host(s, obuf, 4);
>          break;
>      }
>  }

I've just tested this with OS 9 locally and it fixes the issue for me,
so thanks for the patch!

Have you tried any other OS images at all just in case it causes any
regressions? I generally test booting a set of
Linux/NetBSD/FreeBSD/OpenBSD ISO images for OpenBIOS changes, and while
they don't all work it's good to double-check that any changes don't
accidentally regress other OSs.

And one minor nit I've just noticed on second reading: the commit
message is fine except that it should explicitly reference OS 9 to
explain the motivation for the change.


ATB,

Mark.