Re: cx88 invalid video opcodes when VBI enabled

["Daniel Glöckner" <daniel-gl@gmx.net>]

Hi,

On Sun, Apr 15, 2018 at 01:37:50PM -0400, Devin Heitmueller wrote:
> Any suggestions on the best way to debug this without having to learn
> the intimate details of the RISC engine on the cx88?  From the state
> of the RISC engine it looks like there is some issue with queuing the
> opcodes/arguments (where in some cases arguments are interpreted as
> opcodes), but this is certainly not my area of expertise.

> [   54.427224] cx88[0]: irq vid [0x10088] vbi_risc1* vbi_risc2* opc_err*
> [   54.427232] cx88[0]/0: video risc op code error
> [   54.427238] cx88[0]: video y / packed - dma channel status dump

Since the video IRQ status register has vbi_risc2 set, which we never
generate with our RISC programs, I assume it is the VBI RISC engine
that is executing garbage. So the dump of the video y/packed RISC engine
does not help us here. Can you add a call to cx88_sram_channel_dump for
SRAM_CH24 next to the existing one in cx8800_vid_irq?

Best regards,

  Daniel