On Thu, 3 Apr 2014, Scott Holder wrote:
On 4/1/2014 8:23 AM, Finn Thain wrote:
It may be possible to boot Linux with MacOS running in 24-bit mode,
and ISTR that this leads to a large number of memory chunks. The
Penguin documentation says use 32-bit mode (which means installing
Mode32 if you have old MacOS and old ROMs). The only Mac I have here
is running MacOS 7.6 so I can't test 24-bit mode. You can see the
debug output from Penguin below.
I happen to have my crazy PearPC/Mac OS X-booting LC475 still up and
running with a 7.5.5 system folder on it. I rebooted it into 24-bit mode
and loading Penguin does give a warning that 32-bit mode works better.
Attempting to boot generates:
*** Too many memory ranges!!!
Error:
*** setup_ram_mappings() failure - too many mappings
From the Penguin source, MMU/MMU_V2.c, that means more than 32 chunks.
I have a 64mb simm in this LC475; I tried popping it out (leaving me
with 4mb) and it actually did attempt to unpack the kernel, but there's
too little memory to do it. I have a bagful of smaller 72-pin simms
kicking around somewhere; I'll have to dig it out of the closet and try
it again.
You should be able to get Penguin to list the mappings even when it
doesn't have room to unpack a kernel.
But there's probably no need: it seems highly likely that you'd see
no 16 MB chunk on a 16 MB machine in 24-bit mode.
Finn
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