FastRAM base address has no effect

[jotd]

No matter what the values I set (to emulate blizzard 060 memory config) the memory seems to configure itself to 0x4000000


(even if Z3 mapping mode is in automatic...)


See attached picture of the settings screen + the debugger showing PC in fastmem .... not where the fast memory is supposed to be located.





I need this to reproduce strange memory masking/issues for some A1260 users.

[Toni Wilen]

Blizzard RAM is not autoconfig RAM, adjusting Z3 RAM settings won't make any difference.

Also note that Blizzard RAM is added to system by Blizzard boot rom which does some weird mirror checks and can also crash (add same ram twice) if mirrors are not what it expects. Thats why I didn't bother with it and chose static RAM location that works with all supported RAM sizes.

Clear accelerator board RAM slider and then add manual Z3 RAM. If boot ROM is happy with it (address space and size), it should work.

Or just don't bother with Blizzard and add the RAM manually using some addmem like commands.

[jotd]

thanks but

1. I'm not using Blizzard. It's just that on blizzard, memory gets mapped at 0x79000000
2. "clear the slider and add manual Z3" doesn't make sense to me. If I don't add memory, you propose that I use "addmem" without any fastmem configured?

[Toni Wilen]

I thought you wanted to use Blizzard..

Anyway, it works for me (I set 16M at 0x79000000. 256M may not work in this address to alignment issues)

"dm" debugger output:

40000000      64M/1 =      64M -- F32 RTG RAM
44000000     848M/0 =     848M -- F32 <none>
79000000      16M/1 =      16M ID F32 Zorro III Fast RAM
7A000000    2128M/0 =    2128M -- F32 <none>

When setting memory to "manual" mode, it becomes fully manual, AmigaOS won't know it is there and won't add it to system memory list automatically.

[jotd]

indeed with less memory (ex: 64MB, like on my original blizzard) it declares the area properly but it declares a big chunk of 128 megs at 40000000 too (looks that RTG memory gets in the way, because with a non-RTG config it works like you said):

=KS ROM v3.1 (A1200) rev 40.68 (512k) [391773-01/391774-01]
01000000    1008M/0 =    1008M -- F32 <none>
40000000     128M/1 =     128M ID F32 Zorro III Fast RAM #2
48000000       4M/1 =       4M -- F32 RTG RAM
48400000     780M/0 =     780M -- F32 <none>
79000000      64M/1 =      64M ID F32 Zorro III Fast RAM
7D000000    2080M/0 =    2080M -- F32 <none>
FF000000      64K/0 =      64K -- F32 Autoconfig Z3
FF010000   16320K/0 =   16320K -- F32 <none>

[Toni Wilen]

Originally Posted by jotd

40000000     128M/1 =     128M ID F32 Zorro III Fast RAM #2

79000000      64M/1 =      64M ID F32 Zorro III Fast RAM

Notice the difference. You have #2 Z3 Fast ram configured as normal Z3 RAM with non-zero size.

[jotd]

Anyway, I ended up making this work. I had to use addmem (to be run before SETPATCH):

addmem 79000000 TO 79FFFFFF

thanks for your replies.