Re: L4Re: Boot module copying and the MIPS Creator CI20

Philipp Eppelt <[email protected]> Wed, 10 May 2023 10:52:59 +0200
Newsgroups gmane.comp.micro-kernel.l4.devel
Message-ID <[email protected]>
Hi Paul,

I did some unsuccessful poking around in the manual and the MIPS code. I 
just stumbled across the following:

> I can only presume that some machines have bootloaders that clear ERL before 
> the bootstrap code is invoked.

Judging from this sentence in the Status.ERL description of the manual:
"The operation of the processor is UNDEFINED if the ERL bit is set while 
the processor is executing  instructions from kuseg."

I say that this bit should be cleared. The two 256MB regions also point 
to the intention that Status.ERL is clear and thus there is no 
unchached+unmapped useg.


I'm sorry to not have more helpful comments.

Cheers
Philipp

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