AW: [Oberon] USB Boot

Aubrey McIntosh Aubrey.McIntosh at
Tue Jan 17 17:47:23 CET 2006

-- Aubrey McIntosh, Ph.D.

>>> kellerog at 1/17/2006 1:27 AM >>>
> On the linking, if I put the Dec. 19 Crazy fresh release on a CD, change the Ramdisk size to 140Mb, and change the Linker parameters to build the file onto RAM: and read the binaries from CD:, the system traps in Bblinker0.Relocate.  Has anyone built AosUSB.Bin from the distributed image?

can you tell us what value the constant HeapSize in BbLinker0 on your 
machine has? it's possible, that you do have the version where the 
linker-internal heap is 512KB at most, which usually leads to the trap 
you described. to fix that, you can just multiply the value by 2, 
compile, free and use again ...


Hi Roger,

The value in the release is 2 * 512 * 1024;

When I free & re-compile  (with PC.Compile :-) I get the same trap.  When I change the value to 4*512*1024, I get a trap at the same pc, but a different value of adr.

The ASSERT is failing on the third term in the expression.  I assume that it is easy for you to reproduce this, and there is no need to clutter the mailing list with dumps.

When I was working on AosFtpFS, I frequently had .Bin files that produced traps.  At that point I read through the source for the linker and boot loader, and I had the impression that the bootloader executed in real mode, so it only had access to the legacy 640Kb memory limit, and so the linker limit was not so much an unfortunately chosen constant as a hard engineering constraint.  

I ended up having to remove some functionality, I think XML configuration support, in order to obtain a working .Bin file.  

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