[colorforth] Non-working colorForth

[Dirk Harms-Merbitz <dirk@xxxxxxxxx>]

The program "lspci" generates the output below under Linux.

>lspci -v

<snip>
00:08.0 VGA compatible controller: Neomagic Corporation [MagicMedia 256AV] (rev 20) (prog-if 00 [VGA])
        Subsystem: Sony Corporation: Unknown device 8040
        Flags: medium devsel, IRQ 9
        Memory at fd000000 (32-bit, prefetchable) [size=16M]
        Memory at fe800000 (32-bit, non-prefetchable) [size=4M]
        Memory at fed00000 (32-bit, non-prefetchable) [size=1M]
        Capabilities: [dc] Power Management version 1
<snip>

On Fri, Jul 27, 2001 at 10:00:01PM +0100, Steve Smith wrote:
> Hi there,
> 
> I managed to get colorForth to boot and save on my HP Vectra XA with a
> Matrox Millenium PCI (NOT AGP) card. I worked once I understood a bit
> more about the PCI bus and how many modern VGA cards put a linear frame
> buffer in memory.
> 
> For those interested, the following is a summary of how I did it. It's
> somewhat technical and if you do it to your own PC then I admit NO
> responsibility if you screw up. Anyway...
> 
> I used a tool called pci.exe (Craig Hart's PCI+AGP bus sniffer)
> available from http://members.hyperlink.net.au/~chart/ to identify the
> VGA registers in PCI space. It generated the following:-
> 
> MATROX MILLENIUM INFO
> =====================
> ----------
> PCI bus 00 device 0A function 00:  Header Type 'non-bridge' (single-
> func)
> Vendor: 102B    Matrox Graphics, Inc.                             
> Device: 0519    2064W (Millenium)                                 
> Class:    03    display                 Revision:       01
> SubClass: 00    VGA                     ProgramI/F:     00
> CommandReg:      0083 = I/O-on mem-on wait-cyc
> Status Reg:      0280 = fast-trns (med)
> CacheLine:         00   Latency:        00      BIST:        00
> SubsysVendor:    0000   SubsysDevice: 0000
> Base Addresses:
>         (0) FEDFC000 = mem base=FEDFC000 len=16K
>         (1) FE000008 = mem base=FE000000 len=8M prefetchable
> ----------
> 
> I then edited the gen.asm file to use 80005008h instead of 80010008h in
> the following lines:
> 
> gen.asm
> =======
> ----------
> ati0: ;  call dev
> ;   mov  EAX, 80010008h ; AGP
>     mov  EAX, 80005008h ; PCI? Bus 0 dev 10 fun 0
>     add  AL, 24h-8 ; look for prefetch
>     mov  CL, 5
> @@:     DUP_
>         call north
>         xor  AL, 8
>         jz   @f
>         DROP
>         sub  EAX, 4
>         next @b
>     DUP_
>     call north
>     and  EAX, 0fffffff0h
> ;   mov EAX, 0FE000000h ; works on Vectra XA! (with matrox mill II)
> @@: mov  displ, EAX
>     DROP
>     ret
> -------------
> 
> Reassembling this produced a bootable colorForth. Using the same method
> as xxx to add on the source blocks produced the final file.
> 
> Notice the commented-out line where I originally forced the value of
> FE000000h into the "displ" variable to check whether this was the
> correct frame buffer address.
> 
> PCI
> ===
> 
> Notice in the constant 80005008h that the 1 is replaced by 0 compared
> with the original 80010008h. This indicates that bus 0 is to be used
> instead of bus 0, which is usual for non-AGP cards. Also note the 5.
> This translates to the device address 0Ah (or 10 if you prefer).
> 
> I worked this out after studying the document pci.txt from the vga file
> collection I downloaded from http://www.programmersheaven.com/,
> vgadoc4b.zip:-
> ------------
> the following comments on the PCI registers:
> CF8h D(R/W):
> bit   0-7  Index into the configuration space to read/write at CFCh
>     11-15  Card ID (0 - 31)
>     16-19  PCI Bus ID (0 - 15)
>        31  Set to enable the PCI bus configuration space
> 
> CFCh D(R/W):
> bit  0-31  The index register identified by the PCI bus/card ID/Index in
> CF8h
>            can be accessed here.
> -----------
> 
> Hope this helps a few of you.
> 
> Cheers,
> 
> Steve.
> -- 
> Steve Smith
> ------------------------
> 
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> 
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