Re: Discontigmem for ep93xx

[Marco <marco.stornelli@xxxxxxxxxx>]

Russell King - ARM Linux ha scritto:
> On Mon, Nov 10, 2008 at 03:51:04PM +0100, Marco Stornelli wrote:
>> I'm using the TS-7200 board. The support for that board is built-in in
>> the kernel. I'm using even a kernel version provided by the
>> manufacturer. There's a big difference about the memory management. In
>> the official kernel there's no declaration of discontigmem and the
>> asm-arm/mach-ep93xx/memory.h is very simple.
> 
> Discontigmem got removed - it's supposed to be used for NUMA, and so
> has additional complexities that just aren't required.  Eventually,
> discontigmem will be removed from the mainline kernel in its entirety.

Ah ok, but starting from which kernel version?

> 
> Sparsemem replaces this, and I've been half-heartedly trying to get
> people to change over to this for the last few years.  For the last
> merge window, I pushed this harder, and converted everything over to
> sparsemem.
> 
> Have a look at 07f841b7c587a3cbf481509be09ba5eda05f8d31 to see what's
> required.  Unfortunately, I don't have time (concall right now) to go
> through the complexities to convert that to a git URL, so you'll have
> to look up that commit yourself.
> 

However there's something strange for this board, because I'm seeing for
example the kernel 2.6.26, but neither sparsemem or discontigmem are
enabled. In addition some information (for example how it's "sparse" the
mem, etc.) are missing. Even if now the new "philosophy" is sparsemem I
should find somewhere (more or less) the same information, i.e. the
board has got four "segment" of ram each of 8MB with different
addressees, and so on, right?


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