Re: [PATCH] MIPS: fix pfn_valid() for FLAGMEM

[Sergei Shtylyov <sshtylyov@ru.mvista.com>]

Hello, I wrote:

> > > > Are the non-memory parts marked as reserved?
> > > No, so, is that a need to mark them?
> > Initially all pages are marked as reserved.
> > Which seems to be good enough for x86:
> > $ cat /proc/iomem
> > 00000000-0009efff : System RAM
> > 0009f000-0009ffff : reserved
> > 000c0000-000cffff : pnp 00:0d
> > 000e0000-000fffff : pnp 00:0d
> > 00100000-7fe5b7ff : System RAM
> > [...]
> > The 0x9f000 - 0x9ffff range is the good old ISA I/O memory range (classic
> > MDA/CGA/VGA etc.), that is non-memory yet:
>
>    Not really, it's a usual RAM. CGA/VGA video memory occupies 
   Oh, I meant EGA/VGA. CGA memory is at 000b8000-000bffff, of course.

> 000a0000-000bffff and MDA occupies 000b0000-000b7ffff (if not less).
> This range is probably reserved by BIOS for something like EBDA...
   Which stands for Extended BIOS Data Area.

WBR, Sergei