[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Re: Using more than 1 GB in qemu-m68k-system

On Sat, 14 Dec 2019, John Paul Adrian Glaubitz wrote:

> Hi!
> When installing Debian/m68k inside qemu-m68k-system [1], we are 
> currently limited to 1 GB of physical memory which is due to a limit in 
> the Linux kernel as far as I know.
> However, I also know that it is possible to run the m68k kernel on 
> Aranym with up to 3.5 GB of RAM. Thus, I was wondering whether there 
> would be chance we could get the kernel patched to support more than 1 
> GB of memory also on qemu-m68k-system which currently emulates an Apple 
> Macintosh Quadra 800 system.
> Adrian
> > [1] https://wiki.debian.org/M68k/QemuSystemM68k

I believe that the reason for the limitation is the Mac memory map, as 
Laurent pointed out in the issue tracker,

It's theoretically possible to use NuBus slot space for additional RAM. 

The super slot space ($6000 0000 thru $EFFF FFFF) is 2304 MB in size and 
the standard slot space ($F100 0000 thru $FFFF FFFF) is another 239 MB.

I'm not sure about any hardware designs that took advantage of this 
possibility (Radius Rocket perhaps?).


Reply to: