Re: [Qemu-devel] [RFC v2 23/23] 40p: Add an IBM 8514/A graphics card

["Hervé Poussineau" <hpoussin@reactos.org>]

Andreas Färber a écrit :
> Am 18.06.2011 um 22:42 schrieb Blue Swirl:
>> Please take a look at tcx.c for a 8 bit mode frame buffer with palette
>> translation. Also VGA_DIRTY bit handling should be added to this loop
>> to speed it up.
>
> Will look into it.
>
> I doubt this is causing the long delays though.
> * There's an unhandled write to the PCI card's config address 0x4, for 
> which I have no documentation.
I don't have any documentation either for this graphic card :(

> * Generally, there are some unhandled writel to 0x680, which look like 
> IBM progress codes (but I didn't find a manual to decode them - 
> Hervé?), and
Port 0x680 is a diagnostic port, related to what appears in the 
"operator display".
32 bit values are written to this port, and first byte meaning can be 
found in this document : http://ps-2.kev009.com:8081/rsinfo/Fcodes.htm
With that, you can see that first long step is 0x09, ie "Copy CRC 
verification code to RAM"

> * a frequent writeb to 0x690 with value 0x1 or 0x3 (some activity LED 
> maybe?).
> I thought it might be trying to access the missing NCR 53C810 SCSI but 
> saw no indication of that.
The operator display/operator panel also contains 2 LEDs: one for Power 
On, and the other one for Disk Drive Activity. You might indeed have 
found the I/O port to control them.

Hervé