On Sat, 3 Oct 2020, Maciej W. Rozycki wrote:
> > Interesting. Seems MIPS does support mem=X@Y, even though the document
> > of 'mem=' says it's used to specify amount of memory, but not memory
> > region. Anyway, leave this to mips reviewers, thanks for replying.
> >
> > ~~~~~~~~~~~~~~~~~~~
> > mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory
> > Amount of memory to be used in cases as follows:
>
> Yep, I implemented it for the DECstation back in 2000:
>
> commit 97b7ae4257ef7ba8ed9b7944a4f56a49af3e8abb
> Author: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
> Date: Mon Dec 11 16:41:05 2000 +0000
>
> Memmap fixes from Maciej.
>
> (from the LMO repo) in line with the x86 syntax. I don't know why it
> hasn't ever been documented in "Kernel Parameters" (for any port), but I'm
> fairly sure it has been somewhere.
Self-correction: documentation used to be there, but was removed around
Linux 2.5.65:
commit 041a679cb20e4fcb841665b09cf7c6d24ab4ad39
Author: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Date: Thu Jun 5 00:04:28 2003 +0000
Merge with Linux 2.5.65.
(same repo) as the parameter was renamed to `memmap=' in the x86 port.
Obviously whoever did that did not bother to check other ports, even
though the parameter was marked (and `memmap=' still is) generic.
Maciej
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